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Title: Health - Hair Growth Rate Explains why arm hair stays short, but hair on the head grows long. Includes how animals shed and change the color of their fur.

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Why does the hair on your arms stay short, while the hair on your head can grow very long?

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Please copy/paste the following text to properly cite this How Stuff Works article:"Why does the hair on your arms stay short, while the hair on your head can grow very long?." 01 April 2000. HowStuffWorks.com. <http://health.howstuffworks.com/question100.htm> 12 October 2008. Inside this Article Why does the hair on your arms stay short, while the hair on your head can grow very long? Lots More Information See all Beauty & Hygiene articles Health Videos

More Health Videos » Each hair on your body grows from its own individual hair follicle. Inside the follicle, new hair cells form at the root of the hair shaft. As the cells form, they push older cells out of the follicle. As they are pushed out, the cells die and become the hair we see. close shot of hair

John Foxx/Getty ImagesThe hair follicles on your head are programmed to let hair grow for years at a time.A follicle will produce new cells for a certain period of time depending on where it is located on your body. This period is called the growth phase. Then it will stop for a period of time (the rest phase), and then restart the growth phase again. When the hair follicle enters the rest phase, the hair shaft breaks, so the existing hair falls out and a new hair takes its place. Therefore, the length of time that the hair is able to spend growing during the growth phase controls the maximum length of the hair. The cells that make the hairs on your arms are programmed to stop growing every couple of months, so the hair on your arms stays short. The hair follicles on your head, on the other hand, are programmed to let hair grow for years at a time, so the hair can grow very long. Animals that shed have hair follicles that synchronize their rest phase so that all of the follicles enter the rest phase at once. This way, all of the hair falls out at one time. A dog that sheds will lose its hair in large clumps. Many animals can also switch the coloring agent in the hair follicle on and off -- so in the summer, the hair is pigmented �brown with melanin (see How Sunburns and Sun Tans Work to learn about melanin), but in the winter it is not pigmented, leaving the hair white.To learn more about hair and related topics, try the links on the next page. Next Page Inside this Article Why does the hair on your arms stay short, while the hair on your head can grow very long? Lots More Information See all Beauty & Hygiene articles Related Ad Categories /* '); document.write(''); for (i = 0; i < 3; ++i) { document.write('' + radlinks[i].term + ''); } document.write(''); document.write(''); for (i = 3; i < radlinks.length; ++i) { document.write('' + radlinks[i].term + ''); } document.write(''); document.write('');}var ads = new Array;google_ad_output = 'js';google_ad_client = 'ca-howstuffworks_radlinks_js';google_ad_channel = '-Article';google_safe = 'high';google_num_radlinks = 5; // Number of radlink terms to returngoogle_max_radlink_len = 23;google_max_num_ads = '0';google_prev_ad_formats = '';/* ]]> */

Symptom Checker:

Abdominal Bloating Abdominal Fullness Prematurely Afte... Abdominal Lumps Abdominal Mass Abdominal Pain Abdominal Rigidity Abdominal Sounds Abdominal Swelling Abnormal Posturing Abnormal Tooth Shape Abnormally Dark Or Light Skin Absent Menstruation Absent Thirst Agitation Ambiguous Genitalia Ankle Pain Appetite Decrease Appetite Increase Apraxia Arachnodactyly Armpit Lump Autistic Behavior Babinski's Reflex Bed Wetting Belching Binge Eating Blackheads Bleeding Gums Bleeding Into The Skin Blindness Blockage Of Leg Arteries Blood In The Semen Blood in Urine Bloody Or Tarry Stools Bone Pain Or Tenderness Bounding Pulse Bowel Incontinence Breast Lump Breast Pain Breath Odor Breath Sounds Breathing - Slowed Or Stopped Breathing Difficulty Breathing Difficulty When Lying Dow... Breathing That Sounds Abnormal Broad Nasal Bridge Bulging Fontanelles Bullae Chemosis Chest Pain Chills Clammy Skin Claw Foot Claw Hand Cloudy Cornea Clubbing Of The Fingers Or Toes Cold Intolerance Coloboma Of The Iris Comedones Confusion Constipation Contracture Deformity Coughing Coughing Up Blood Crying Excessively in Infants Cyst Decerebrate Posture Decorticate Posture Decreased Consciousness Decreased Urine Output Delayed Growth Delayed or Absent Tooth Formation Depression Diarrhea Difficulty with Urination Dizziness Drooling Drowsiness Dry Eyes Dry Hair Dry Skin Ear Discharge Earache Earlobe Creases Elbow Pain Epicanthal Folds Erection Problems Erosion Excessive Or Unwanted Hair In Women Excessive Thirst Excessive Urination Excessive Urination at Night Excessively Large Fontanelles Eye Burning, Itching and Discharge Eye Pain Eye Redness Eye Slant Eyelid Drooping Eyes That Bulge Face Pain Facial Paralysis Facial Swelling Fainting Fatigue Female ual Dysfunction Fever Finger Pain Fingers That Change Color Flank Pain Floating Stools Focal Neurological Deficits Foot Pain Foot, Leg, And Ankle Swelling Foul Smelling Stools Frequent Or Urgent Urination Frontal Bossing Gas (Flatulence) Gastrointestinal Bleeding Genital Sores (Female) Genital Sores (Male) Groin Lumps Groin Pain Gynecomastia Hair Loss Hallucinations Hand Or Foot Spasms Hand Tremors Hearing Loss Heart Murmurs And Other Sounds Heart Palpitations Heartburn Heat Intolerance Heavy, Prolonged, or Irregular Mens... Heel Pain Hemolytic Crisis Hepatomegaly Heterochromia Hiccups Hip Pain Hoarseness Or Changing Voice Hump Behind The Shoulders Hyperactivity Hyperelastic Skin Hypermobile Joints Hyperventilation Hypotonia Impaired Smell Increased Head Circumference Indigestion Infantile Reflexes Insect Bites And Stings Intercostal Retractions Intertrigo Irritability Itching Jaundice (Yellow Skin) Joint Pain Joint Swelling Knee Pain Leg Pain Lichenified Limited Range Of Motion Lordosis Low Nasal Bridge Lower Back Pain Macule Malaise Memory Loss Metopic Ridge Microcephaly Micrognathia Morbid Obesity Morning Sickness Moro Reflex Motormental Retardation Mouth Sores Muscle Aches Muscle Atrophy Muscle Cramps Muscle Function Loss Muscle Twitching Nail Abnormalities Nasal Congestion Nasal Discharge Nasal Flaring Natal Teeth Nausea And Vomiting Neck Lumps Neck Pain Night Blindness Nightmares Nikolsky’s Sign Nipple Discharge Nodules Nosebleed Numbness And Tingling Obesity Opisthotonos Pain During ual Intercourse Painful Menstrual Periods Painful Urination Pale or Clay-Colored Stools Paleness Papule Patches Patchy Skin Color Pectus Carinatum Pectus Excavatum Penis Pain Photophobia Pilonidal Dimple Pinna Abnormalities And Low-set Ear... Point Tenderness Polydactyly Polyhydramnios Poor Feeding In Infants Preauricular Tag Or Pit Premenstrual Breast Tenderness and ... Prognathism Pupils That Are Different Sizes Purpura Pustules Rapid Shallow Breathing Rash in a Child Under 2 Years Rashes Rib Cage Pain Ridged Sutures Scales Scrotal Swelling Seizures Sensorineural Deafness Separated Sutures Shin Splints Short Philtrum Short Stature Shoulder Pain Simian Crease Skeletal Limb Abnormalities Skin Blushing/flushing Skin Discoloration Skin Lumps Skin Turgor Sleeping Difficulty Sneezing Snoring Sore Throat Spasticity Speech Impairment () Splenomegaly Splinter Hemorrhages Strange Behavior Stress And Anxiety Striae Subcutaneous Emphysema Sunburn Sunken Fontanelles Supernumerary Nipples Swallowing Difficulty Swallowing Pain Or Burning Sweating Sweating Decrease Swelling Swollen Glands Swollen Gums Taste Impairment Telangiectasia Tenesmus Testicle Lump Testicle Pain Tinnitus Tongue Problems Tooth Discoloration Toothaches Ulcers Uncontrollable Eye Movements Uncontrollable Movement Uncontrolled Or Slow Movement Uncoordinated Movement Unpredictable Or Jerky Movement Urinary Incontinence Urine Discoloration Vaginal Bleeding Between Periods Vaginal Bleeding In Pregnancy Vaginal Discharge Vaginal Itching Vesicles Vision Problems Vomiting Blood Walking Abnormalities Watery Eyes Weak or Absent Pulse Weakness Webbing Of The Fingers Or Toes Weight Gain Weight Loss Wheezing White Spots in the Pupil Whitehead Widely Spaced Teeth Wrinkles Wrist Pain Yawning

Diseases and Conditions Glossary:

ABO Incompatibility AIDS ARDS (acute Respiratory Distress Sy... Aarskog Syndrome Aase Syndrome Abdominal Aortic Aneurysm Abortion - Complete Abortion - Elective Or Therapeutic Abortion - Incomplete Abortion - Infected Abortion - Threatened Abscess Acanthosis Nigricans Achalasia Achilles Tendinitis Achondrogenesis Achondroplasia Acidosis Acne Acoustic Neuroma Acoustic Trauma Acquired Platelet Function Defect Acrodermatitis Acrodysostosis Acromegaly Actinic Keratosis Actinomycosis Acute Adrenal Crisis Acute Arterial Occlusion - Kidney Acute Bilateral Obstructive Uropath... Acute Bronchitis Acute Cerebellar Ataxia Acute Cholecystitis (Gallstones) Acute Cytomegalovirus (CMV) Infecti... Acute Gouty Arthritis Acute HIV Infection Acute Interstitial Nephritis Not NS... 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Acute Upper Airway Obstruction Addison’s Disease Adenomyosis Adhesion Adjustment Disorder Adolescent Depression Adolescent Pregnancy Adrenocortical Carcinoma Adrenoleukodystrophy Still's Disease Agammaglobulinemia Age-related Hearing Loss Agoraphobia Agranulocytosis Aicardi Syndrome Albinism Alcohol Withdrawal Alcoholic Cardiomyopathy Alcoholic Ketoacidosis Alcoholic Liver Disease Alcoholic Neuropathy Alcoholism Alcoholism In-Depth Alkalosis Alkaptonuria Allergic Conjunctivitis Allergic Rhinitis Allergic Rhinitis In-Depth Allergic Vasculitis Allergies Allergy To Mold - Dander - Dust Alopecia Areata Alpha-1 Antitrypsin Deficiency Alport Syndrome Alström Syndrome Alveolar Abnormalities Alzheimer’s - Resources Alzheimer’s Disease Alzheimer's Disease Epidemic? Alzheimer's Disease In-Depth Amaurosis Fugax Amblyopia Amebiasis Amebic Liver Abscess Amelogenesis Imperfecta Amenorrhea Amniotic Constriction Bands Amphetamine Or Sympathomimetic Into... 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Arthritis Arthritis - Resources Asbestos-related Pleural Effusion Asbestosis Ascariasis Ascites Aseptic Meningitis Aseptic Necrosis Asherman Syndrome Asperger Syndrome Aspergillosis Aspiration Pneumonia Asthma Asthma And Allergy - Resources Asthma In s In-Depth Asthma In Children And Adolescents ... Astigmatism Asymptomatic Bacteriuria Asymptomatic HIV Infection Ataxia-telangiectasia Atelectasis Atheroembolic Renal Disease Atherosclerosis Athlete's Foot Atrial Fibrillation/flutter Atrial Myxoma Atrial Septal Defect Atrophic Vaginitis Attention Deficit Hyperactivity Dis... Attention-deficit Hyperactivity Dis... 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Beriberi Bezoar Bilateral Hydronephrosis Bile Duct Obstruction Biliary Atresia Biliary Stricture Bipolar Disorder Bipolar Disorder In-Depth Birth-acquired Herpes Birthmarks - Pigmented Birthmarks - Red Bladder Cancer Bladder Outlet Obstruction Bladder Stones Blastomycosis Blastomycosis Skin Lesion Bleeding Disorders Bleeding Esophageal Varices Blepharitis Blind Loop Syndrome Blocked Tear Duct Blood Clots Blount's Disease Body Lice Bone Tumors Borderline Personality Disorder Botulism Bowlegs Brachial Palsy In Newborns Brachial Plexopathy Brain Abscess Brain Herniation Brain Tumor - s Brain Tumor - Children Brain Tumors - Primary In-Depth Branchial Cleft Cyst Breast Cancer Breast Cancer In-Depth Breast Infection Breast Milk Jaundice Breath Holding Spell Brief Reactive Psychosis Bronchial Adenoma Bronchiectasis Bronchiolitis Bronchitis Bronchopulmonary Dysplasia Brucellosis Bruxism Bulimia Bullous Pemphigoid Bunions Burkitt Lymphoma Bursitis Byssinosis CMV - Gastroenteritis/colitis CMV - Immunocompromised Host CMV - Pneumonia CMV Esophagitis CMV Retinitis CSF Leak Campylobacter Enteritis Canavan Disease Cancer Cancer - Penis Cancer - Renal Pelvis Or Ureter Cancer - Resources Cancer - Throat Or Larynx Cancer - Vulva Candida Esophagitis Canker Sore Treatment Canker Sores Caplan Syndrome Caput Succedaneum Carbunculosis Carcinoid Syndrome Cardiac Amyloidosis Cardiac Tamponade Cardiogenic Shock Cardiomyopathy Carpal Tunnel Syndrome Carpal Tunnel Syndrome In-Depth Cat Scratch Disease Cataract Cataracts In-Depth Catheter-associated UTI Cavernous Sinus Thrombosis Celiac Disease - Sprue Cellulitis Central Pontine Myelinolysis Central Serous Choroidopathy Central Sleep Apnea Cerebral Hypoxia Cerebral Palsy Cervical Cancer Cervical Cancer In-Depth Cervical Dysplasia Cervical Polyps Cervical Spondylosis Cervicitis Chagas Disease Chalazion Chancroid Chapped Hands Chapped Lips Charcot-Marie-Tooth Disease (heredi... Charley Horse Chediak-Higashi Syndrome Chemical Pneumonitis Chemotherapy Cherry Angioma Chickenpox Chiggers Child Abuse - Physical Child Abuse - ual Child Neglect And Psychological Abu... Childhood Disintegrative Disorder Chinese Restaurant Syndrome Chlamydia Chlamydia Infections In Women Chlamydial Urethritis - Male Choanal Atresia Cholangiocarcinoma Cholangitis Choledocholithiasis Cholera Cholestasis Cholesteatoma Cholesterol In-Depth Chondromalacia Patella Choroidal Dystrophies Chronic Bilateral Obstructive Uropa... Chronic Bronchitis Chronic Cholecystitis Chronic Fatigue Syndrome Chronic Fatigue Syndrome In-Depth Chronic Glomerulonephritis Chronic Gouty Arthritis Chronic Granulomatous Disease Chronic Inflammatory Polyneuropathy Chronic Lymphocytic Leukemia (CLL) Chronic Motor Tic Disorder Chronic Myelogenous Leukemia (CML) Chronic Obstructive Lung Disease In... Chronic Obstructive Pulmonary Disea... Chronic Pancreatitis Chronic Persistent Hepatitis Chronic Renal Failure Chronic Subdural Hematoma Chronic Thyroiditis (Hashimoto̵... Chronic Unilateral Obstructive Urop... Chylomicronemia Syndrome Cirrhosis Cirrhosis In-Depth Cleft Lip And Palate Cleidocranial Dysostosis Clubfoot Cluster Headaches Coal Worker's Pneumoconiosis Coarctation Of The Aorta Cocaine Intoxication Cocaine Withdrawal Coccidioidomycosis Coccidioidomycosis - Acute Pulmonar... Coccidioidomycosis - Chronic Pulmon... Coccidioidomycosis - Disseminated Colds And The Flu In-Depth Colic And Crying Colitis Collagen Vascular Disease Colloid Nodular Goiter Colon And Rectal Cancers In-Depth Colon Cancer Color Blindness Colorado Tick Fever Colorectal Polyps Common Cold Common Peroneal Nerve Dysfunction Compartment Syndrome Complex Regional Pain Syndrome Compression Fractures Of The Back Concussion Conduct Disorder Congenital Adrenal Hyperplasia Congenital Afibrinogenemia Congenital Antithrombin III Deficie... Congenital Cataract Congenital Cytomegalovirus Congenital Heart Disease Congenital Hypothyroidism Congenital Nephrogenic Diabetes Ins... Congenital Nephrotic Syndrome Congenital Platelet Function Defect... Congenital Protein C Or S Deficienc... Congenital Rubella Congenital Spherocytic Anemia Congenital Syphilis Congenital Toxoplasmosis Conjunctivitis Contact Dermatitis Conversion Disorder Cor Pulmonale Corneal Injury Corneal Ulcers And Infections Corns And Calluses Coronary Artery Disease In-Depth Coronary Artery Spasm Coronary Heart Disease Costochondritis Cranial Mononeuropathy III - Compre... Cranial Mononeuropathy III - Diabet... Cranial Mononeuropathy VI Craniopharyngioma Craniosynostosis Craniotabes Creeping Eruption Creutzfeldt-Jakob Disease Cri Du Chat Syndrome Crigler-Najjar Syndrome Crohn's Disease Crohn's Disease In-Depth Croup Cryoglobulinemia Cryptococcosis Cryptosporidium Enteritis Culture-negative Endocarditis Curvature Of The Penis Cushing Syndrome Cushing Syndrome - Exogenous Cushing Syndrome Due To Adrenal Tum... Cushing’s Disease Cutaneous Anthrax Cutaneous Candidiasis Cutaneous Skin Tags Cyanotic Heart Disease Cyclothymic Disorder Cystic Fibrosis Cystic Hygroma Cysticercosis Cystinuria Cystitis - Acute Bacterial Cystitis - Noninfectious Dacryoadenitis Deep Intracerebral Hemorrhage Deep Venous Thrombosis Dehydration Delayed Ejaculation Delirium Delirium Tremens Delta Agent (Hepatitis D) Dementia Dementia Due To Metabolic Causes Dengue Fever Dengue Hemorrhagic Fever Dental Cavities Dependent Personality Disorder Depression - Elderly Depression In-Depth Dermatitis Herpetiformis Dermatomyositis Dermatoses (systemic) Developmental Coordination Disorder Developmental Disorders Of The Fema... Developmental Disorders Of The Vagi... Developmental Dysplasia Of The Hip Developmental Reading Disorder Diabetes Diabetes Diet In-Depth Diabetes Insipidus Diabetes Insipidus - Central Diabetes Insipidus - Nephrogenic Diabetic Hyperglycemic Hyperosmolar... Diabetic Ketoacidosis Diabetic Nephropathy Diabetic Neuropathy Diabetic Retinopathy Diaper Dermatitis - Candida-associa... Diaper Dermatitis - Irritant-induce... Diaphragmatic Hernia Diastasis Recti Diffuse Interstitial Lung Disease Digitalis Toxicity Dilated Cardiomyopathy Diphtheria Diphyllobothriasis Diskitis Disorder Of Written Expression Disseminated Intravascular Coagulat... Disseminated Tuberculosis Distal Median Nerve Dysfunction Distal Renal Tubular Acidosis Distention Of The Colon's Splenic F... Diverticulitis Down Syndrome Drug Abuse And Dependence Drug Allergies Drug-induced Cholestasis Drug-induced Diarrhea Drug-induced Hepatitis Drug-induced Hypertension Drug-induced Hypoglycemia Drug-induced Hypothyroidism Drug-induced Immune Hemolytic Anemi... Drug-induced Immune Thrombocytopeni... Drug-induced Lupus Erythematosus Drug-induced Nonimmune Thrombocytop... Drug-induced Pulmonary Disease Drug-induced Tremor Dry Eye Syndrome Dubin-Johnson Syndrome Duchenne Muscular Dystrophy Duodenal Atresia Dupuytren’s Contracture Dyscrasias Dysfunctional Uterine Bleeding (DUB... Dyshidrotic Eczema Dysmenorrhea In The Adolescent Dysthymia E. Coli Enteritis ECHO Virus Ear Barotrauma Ear Infection - Acute Ear Infections In-Depth Early Symptomatic HIV Infection Eating Disorders In-Depth Ebola Hemorrhagic Fever Echinococcus Eclampsia Ecthyma Ectodermal Dysplasia Ectopic ADH Secretion Ectopic Cushing Syndrome Ectopic Heartbeat Ectopic Pregnancy Ectropion Eczema Ehlers-Danlos Syndrome Ehrlichiosis Ellis-van Creveld Syndrome Emphysema Empty Sella Syndrome Empyema Encephalitis Encopresis End-stage Kidney Disease Endocarditis Endometrial Cancer Endometriosis Endometriosis In-Depth Endometritis Endophthalmitis Enlarged Adenoids Enlarged Prostate Enteritis Entero-enteral Or Enterocutaneous F... Entropion Eosinophilic Fasciitis Epidermolysis Bullosa Epididymitis Epidural Abscess Epiglottitis Epilepsy Epilepsy In-Depth Episcleritis Epispadias Epstein Pearls Erysipelas Erysipeloid Erythema Multiforme Erythema Nodosum Erythema Toxicum Erythrasma Erythroblastosis Fetalis Erythroplasia Of Queyrat Esophageal Atresia Esophageal Cancer Esophageal Perforation Esophageal Spasm Esophageal Stricture - Benign Esophagitis Essential Hypertension Essential Tremor Ethmoiditis Ethylene Glycol Intoxication Eustachian Tube Patency Ewing’s Sarcoma Exfoliative Dermatitis Exogenous Adrenal Insufficiency Expressive Language Disorder - Deve... Extradural Hemorrhage Eyelid Bump Eyelid Twitch Facial Nerve Palsy Facial Nerve Palsy Due To Birth Tra... Facial Tics Facial Trauma Facioscapulohumeral Muscular Dystro... Factitious Hyperthyroidism Factor II Deficiency Factor V Deficiency Factor VII Deficiency Factor X Deficiency Factor XII (Hageman Factor) Deficie... Failure To Thrive Familial Combined Hyperlipidemia Familial Dysbetalipoproteinemia Familial Hypercholesterolemia Familial Hypertriglyceridemia Familial Lipoprotein Lipase Deficie... Familial Mediterranean Fever Familial Tremor Fanconi Syndrome Fanconi's Anemia Farsightedness Febrile Seizures Fecal Impaction Feeding Disorder Of Infancy And Ear... Felty Syndrome Female Pattern Baldness Femoral Hernia Femoral Nerve Dysfunction Fenestration Fetal Alcohol Syndrome Fetal Transfusion Syndrome Fibroadenoma - Breast Fibrocystic Breast Disease Fibromyalgia Fibromyalgia In-Depth Fibrous Dysplasia Fifth Disease Fleas Fluid Imbalance Focal Segmental Glomerulosclerosis Folate Deficiency Folate-deficiency Anemia Folliculitis Food Allergies Food Poisoning Foot Pain In-Depth Fractured Clavicle In The Newborn Fragile X Syndrome Friedreich's Ataxia Frozen Shoulder Fungal Arthritis Fungal Nail Infection Furuncle Fusion Of The Ear Bones Galactosemia Gallbladder Disease Gallstones Gallstones And Gallbladder Disease ... Ganglioneuroblastoma Ganglioneuroma Gangrene Gas Gangrene Gastric Cancer Gastric Ulcer Gastritis Gastritis - Acute Gastritis - Chronic Gastroesophageal Reflux Disease Gastroesophageal Reflux Disease And... Gastroesophageal Reflux In Infants Gastrointestinal Perforation Gastroparesis Gastroschisis Gaucher Disease Gender Identity Disorder General Paresis Generalized Anxiety Disorder Generalized Tonic-clonic Seizure Genital Herpes Genital Warts Geographic Tongue Gestational Diabetes Gestational Trophoblastic Disease Giardiasis Gigantism Gilbert's Disease Gilles De La Tourette Syndrome Gingivitis Gingivostomatitis Glanzmann’s Disease Glaucoma Glaucoma In-Depth Glomerulonephritis Glomus Jugulare Tumor Glomus Tympanum Tumor Glossitis Glossopharyngeal Neuralgia Glucagonoma Glucose-6-phosphate Dehydrogenase D... Goiter Gonococcal Arthritis Gonococcemia (disseminated) Goodpasture Syndrome Gout In-Depth Graft-versus-host Disease Granuloma Annulare Granuloma Inguinale Graves Disease Gray Syndrome Grief Group B Streptococcal Septicemia Of... Growth Hormone Deficiency Guillain-Barre Syndrome Gumma HELLP Syndrome HIV Infection Hairy Cell Leukemia Hallervorden-Spatz Disease Hammer Toe Hand - Foot - Mouth Disease Hantavirus Hartnup Disorder Head Lice Headache Headache Causes Headaches - Cluster In-Depth Headaches - Tension In-Depth Heart Attack Heart Attack And Acute Coronary Syn... Heart Disease Heart Disease - Resources Heart Disease And Vitamin E Heart Disease And Women Heart Failure Heart Failure In-Depth Heart-healthy Diet In-Depth Helicobacter Pylori Hemangioma Hemochromatosis Hemoglobin C Disease Hemoglobinopathy Hemolytic Anemia Hemolytic Anemia Caused By Chemical... Hemolytic-uremic Syndrome (HUS) Hemophilia Hemophilia A Hemophilia B Hemorrhagic Stroke Hemorrhoids Hemothorax Henoch-Schonlein Purpura Hepatic Encephalopathy Hepatic Hemangioma Hepatic Ischemia Hepatic Vein Obstruction (Budd-Chia... Hepatitis Hepatitis A Hepatitis A - Vaccine Hepatitis B Hepatitis B - Vaccine Hepatitis C Hepatitis In-Depth Hepatocellular Carcinoma Hepatocerebral Degeneration Hepatorenal Syndrome Hereditary Amyloidosis Hereditary Angioedema Hereditary Elliptocytosis Hereditary Fructose Intolerance Hereditary Ovalocytosis Hereditary Urea Cycle Abnormality Hernia Herniated Nucleus Pulposus (slipped... Herpangina Herpes Esophagitis Herpes Labialis (oral Herpes Simple... Herpes Simplex Herpes Simplex In-Depth Herpes Zoster Herpetic Stomatitis Hiatal Hernia High Arch High Blood Cholesterol And Triglyce... High Blood Pressure In-Depth Hirschsprung’s Disease Histiocytosis Histoplasmosis Histoplasmosis - Acute (primary) Pu... Histoplasmosis - Chronic Pulmonary Histoplasmosis - Disseminated Histrionic Personality Disorder Hives Hodgkin’s Lymphoma Hodgkin's Disease In-Depth Homocystinuria Hookworm Horner Syndrome Hospital-acquired Pneumonia Hot Tub Folliculitis Hunter Syndrome Huntington's Disease Hurler Syndrome Hydatidiform Mole Hydrocarbon Pneumonia Hydrocele Hydrocephalus Hymenolepiasis Hyperaldosteronism Hypercalcemia Hypercoagulable States Hyperemesis Gravidarum Hyperglycemia - Infants Hyperhidrosis Hyperimmunization Hyperimmunoglobulin E Syndrome Hyperkalemia Hyperkalemic Periodic Paralysis Hyperparathyroidism Hypersensitivity Pneumonitis Hypersplenism Hypertension Hypertensive Heart Disease Hypertensive Intracerebral Hemorrha... Hypertensive Retinopathy Hyperthyroidism Hypertrophic Cardiomyopathy Hyperviscosity - Newborn Hypervitaminosis A Hypervitaminosis D Hyphema Hypocalcemia - Infants Hypochondria Hypoglycemia Hypogonadism Hypogonadotropic Hypogonadism Hypokalemia Hypokalemic Periodic Paralysis Hypomagnesemia Hyponatremia Hypoparathyroidism Hypophosphatemia Hypopituitarism Hypoplastic Left Heart Hypospadias Hypotension Hypothalamic Dysfunction Hypothalamic Tumor Hypothyroidism Hypothyroidism - Primary Hypothyroidism - Secondary Hypothyroidism In-Depth Hypovolemic Shock Ichthyosis Vulgaris Idiopathic Aplastic Anemia Idiopathic Autoimmune Hemolytic Ane... Idiopathic Hypercalciuria Idiopathic Hypersomnia Idiopathic Or Primary Livedo Reticu... Idiopathic Pulmonary Fibrosis Idiopathic Thrombocytopenic Purpura... IgA Nephropathy (Berger’s Dis... Immune Hemolytic Anemia Immunodeficiency Disorders Impacted Tooth Imperforate Anus Impetigo Incontinentia Pigmenti Achromians Incontinentia Pigmenti Syndrome Increased Intracranial Pressure Industrial Bronchitis Inevitable Abortion Infant Botulism Infant Of Diabetic Mother Infectious Endocarditis Infectious Myringitis Infertility Ingrown Toenail Inhalation Anthrax Inhibited ual Desire Injury - Kidney And Ureter Insomnia In-Depth Insulinoma Inter Interstitial Cystitis (IC) Interstitial Keratitis Interstitial Nephritis Intestinal Ischemia And Infarction Intestinal Leiomyoma Intestinal Obstruction Intra-abdominal Abscess Intracerebral Hemorrhage Intraductal Papilloma Intrauterine Growth Restriction Intussusception (children) Iron Deficiency Anemia Iron Deficiency Anemia - Children Irregular Sleep-wake Syndrome Irritable Bowel Syndrome Ischemic Cardiomyopathy Ischemic Colitis Isolated Sleep Paralysis Jaundice-associated Conditions Jock Itch Juvenile Angiofibroma Juvenile Rheumatoid Arthritis Kaposi’s Sarcoma Kawasaki Disease Keloids Keratoconus Keratosis Obturans Keratosis Pilaris Kidney Disease Kidney Disease - Resources Kidney Function Tests Kidney Infection (pyelonephritis) Kidney Removal Kidney Stones Kidney Stones In-Depth Klinefelter Syndrome Klippel-Trenaunay Syndrome Knock Knees Krabbe Disease Kuru Kwashiorkor Kyphosis Labyrinthitis Lack Of Intrinsic Factor Lacrimal Gland Tumor Lactic Acidosis Lactose Intolerance Lambert-Eaton Syndrome Lamellar Ichthyosis Laryngeal Nerve Damage Laryngitis Left-sided Heart Failure Legg-Calve-Perthes Disease Legionnaire's Disease Leiomyosarcoma Leishmaniasis Leprosy Leptospirosis Lesch-Nyhan Syndrome Leukemia Leukemoid Reaction Leukoplakia Leydig Cell Tumor Lichen Planus Lichen Simplex Chronicus Limb-girdle Muscular Dystrophies Listeriosis Liver Disease Liver Metastases Liver Spots Lobar Intracerebral Hemorrhage Lower Esophageal Ring (Schatzki) Ludwig’s Angina Lumps In The Breasts Lung Cancer Lung Cancer - Non-small Cell Lung Cancer - Small Cell Lung Disease Lupus Anticoagulants Lupus Nephritis Luteal Phase Defect Lyme Disease Lyme Disease - Chronic Persistent Lyme Disease - Early Disseminated Lyme Disease - Primary Lyme Disease And Related Tick-borne... Lymph Follicular Hypertrophy Lymphadenitis And Lymphangitis Lymphatic Obstruction Lymphogranuloma Venereum Lymphoid Hyperplasia MRSA Infection Macroamylasemia Macroglobulinemia Of Waldenstrom Macular Degeneration Major Depression Major Depression With Psychotic Fea... Malabsorption Malaria Male Pattern Baldness Malignant Hypertension (arteriolar ... Malignant Hyperthermia Malignant Otitis Externa Malignant Teratoma Mallory-Weiss Tear Malnutrition Malocclusion Of Teeth Maple Syrup Urine Disease Marfan Syndrome Marijuana Intoxication Mastoiditis Maternal Deprivation Syndrome Mathematics Disorder McArdle Syndrome McCune-Albright Syndrome Measles Meatal Stenosis Meckel's Diverticulum Meconium Aspiration (inhalation) Mediastinal Tumor Mediastinitis Medullary Carcinoma Of Thyroid Medullary Cystic Kidney Disease Megaloblastic Anemia Meibomianitis Melanoma Melanoma And Other Skin Cancers In-... Melanoma Of The Eye Melasma Membranoproliferative GN I Membranoproliferative GN II Membranous Nephropathy Meniere’s Disease Meningitis Meningitis - Cryptococcal Meningitis - Gram-negative Meningitis - H. Influenzae Meningitis - Meningococcal Meningitis - Pneumococcal Meningitis - Tuberculous Meningococcemia Menkes Syndrome Menopause Menopause In-Depth Menstrual Disorders In-Depth Mental Retardation Mesenteric Artery Ischemia Mesenteric Venous Thrombosis Mesothelioma (benign-fibrous) Mesothelioma (malignant) Metabolic Acidosis Metabolic Neuropathies Metachromatic Leukodystrophy Metastatic Brain Tumor Metastatic Cancer To The Lung Metastatic Pleural Tumor Metatarsus Adductus Methanol Intoxication Methemoglobinemia Methemoglobinemia - Acquired Methylmalonic Acidemia Methylmercury Poisoning Migraine Migraine - Resources Migraine Headaches In-Depth Migraine With Aura Migraine Without Aura Milia Milk-alkali Syndrome Mineral Metabolism Disorders Minimal Change Disease Miscarriage Mitral Regurgitation - Acute Mitral Regurgitation - Chronic Mitral Stenosis Mitral Valve Prolapse Mittelschmerz Mixed Receptive-expressive Language... Mixed Tension Migraine Molluscum Contagiosum Mongolian Blue Spots Mononeuritis Multiplex Mononeuropathy Mononucleosis Morquio Syndrome Mosaicism Mouth Ulcers Mucormycosis Mucous Cyst Multi-infarct Dementia Multifocal Atrial Tachycardia Multiple Endocrine Neoplasia (MEN) ... Multiple Endocrine Neoplasia Type I Multiple Lentigines Syndrome Multiple Myeloma Multiple Sclerosis Multiple Sclerosis - Resources Multiple Sclerosis In-Depth Multiple System Atrophy Mumps Munchausen Syndrome By Proxy Muscular Dystrophy Myasthenia Gravis Mycoplasma Pneumonia Myelomeningocele (children) Myocardial Contusion Myocarditis Myopathic Changes Myositis Myotonia Congenita Nabothian Cyst Narcissistic Personality Disorder Narcolepsy Narcolepsy In-Depth Nasal Polyps Natural Short Sleeper Nearsightedness Necrotizing Enterocolitis Necrotizing Granuloma Necrotizing Soft Tissue Infection Necrotizing Vasculitis Neonatal Conjunctivitis Nephrocalcinosis Nephrotic Syndrome Neuralgia Neuroblastoma Neurofibromatosis 2 Neurofibromatosis-1 Neurogenic Bladder Neuronal Ceroid Lipofuscinoses (NCL... Neuropathy Secondary To Drugs Neurosarcoidosis Neurosyphilis Neutropenia - Infants Newborn Jaundice Nicotine Withdrawal Niemann-Pick Disease Night Terror Nipple Problems Nocardia Infection Noma Non-Hodgkin's Lymphoma Non-Hodgkin's Lymphoma In-Depth Non-gonococcal (septic) Bacterial A... Non-small Cell Lung Cancer In-Depth Nonspecific Back Pain Noonan Syndrome Normal Pressure Hydrocephalus (NPH) Nummular Eczema Nursemaid’s Elbow Obesity Hypoventilation Syndrome (O... Obsessive-compulsive Disorder Obsessive-compulsive Personality Di... Obstructive Uropathy Occupational Asthma Occupational Hearing Loss Olivopontocerebellar Atrophy Omphalocele Opiate Withdrawal Opioid Intoxication Oppositional Defiant Disorder Optic Glioma Optic Nerve Atrophy Optic Neuritis Oral Cancer Orbital Cellulitis Orbital Pseudotumor Orchitis Organic Brain Syndrome Osgood-Schlatter Disease Osler-Weber-Rendu Syndrome Osmotic Diuresis Osteitis Fibrosa Osteoarthritis Osteoarthritis In-Depth Osteogenesis Imperfecta Osteomalacia Osteomyelitis Osteopenia - Premature Infants Osteoporosis Osteoporosis In-Depth Osteosarcoma Otitis Otitis Media - Chronic Otitis Media With Effusion Otosclerosis Ovarian Cancer Ovarian Cancer Dangers Ovarian Cancer In-Depth Ovarian Cysts Ovarian Hypofunction Ovarian Overproduction Of Androgens Ozena Paget’s Disease Painless (silent) Thyroiditis Palatal Myoclonus Pancreas Divisum Pancreatic Abscess Pancreatic Carcinoma Pancreatic Islet Cell Tumor Pancreatic Pseudocyst Pancreatitis Panic Disorder Panic Disorder With Agoraphobia Parainfluenza Paranoid Personality Disorder Paraphimosis Parapneumonic Pulmonary Effusion Paraquat Lung Parathyroid Adenoma Parathyroid Cancer Parathyroid Hyperplasia Parinaud Syndrome Parkinson’s Disease Parkinson’s Disease - Resourc... Parkinson's Disease In-Depth Paronychia Paroxysmal Cold Hemoglobinuria (PCH... Paroxysmal Nocturnal Hemoglobinuria... Paroxysmal Supraventricular Tachyca... Partial (focal) Seizure Passive-aggressive Personality Diso... Patent Ductus Arteriosus Patent Foramen Ovale Pathological Gambling Pediatric Asthma Pellagra Pelvic Inflammatory Disease (PID) Pemphigus Vulgaris Peptic Ulcer Peptic Ulcers In-Depth Pericarditis Pericarditis - After Heart Attack Pericarditis - Bacterial Pericarditis - Constrictive Perichondritis Periodic Paralysis With Hypokalemia Periodontal Disease In-Depth Periodontitis Perioral Dermatitis Periorbital Cellulitis Peripartum Cardiomyopathy Peripheral Artery Disease And Inter... Peripheral Neuropathy Perirenal Abscess Peritonitis Peritonitis - Dialysis Associated Peritonitis - Secondary Peritonitis - Spontaneous Peritonsillar Abscess Periventricular Leukomalacia Pernicious Anemia Personality Disorders Pertussis Pes Planus Petit Mal Seizure Petrositis Peutz-Jeghers Syndrome Pharyngitis Pharyngitis - Gonococcal Pharyngitis - Viral Pharyngomaxillary Space Abscess Phenylketonuria Pheochromocytoma Phlegmasia Cerulea Dolens Phobia - Simple/specific Phonological Disorder Pica Pick’s Disease Pierre Robin Syndrome Pinguecula Pinworms Pituitary Infarction Pituitary Tumor Pityriasis Alba Pityriasis Rosea Pityriasis Rubra Pilaris Placenta Abruptio Placenta Previa Placental Insufficiency Plague Plantar Fasciitis Pleural Effusion Pleurisy Plummer-Vinson Syndrome/esophageal ... Pneumocystis Carinii Pneumonia Pneumomediastinum Pneumonia Pneumonia In Immunocompromised Host Pneumonia In-Depth Pneumothorax Poison Ivy - Oak - Sumac Poison Ivy Itchiness Poliomyelitis Polyarteritis Nodosa Polychromatophilia Polycystic Kidney Disease Polycystic Ovary Disease Polycythemia Vera Polymorphic Light Eruption Polymyalgia Rheumatica Polymyositis - Porphyria Port-wine Stain Portacaval Shunt Post-partum Depression Post-splenectomy Syndrome Post-streptococcal GN Post-traumatic Stress Disorder Posterior Fossa Tumor Posterior Tongue Carcinoma Potter Syndrome Prader-Willi Syndrome Precocious Puberty Preeclampsia Premature Ejaculation Premature Infant Premenstrual Dysphoric Disorder Premenstrual Syndrome Prerenal Azotemia Presbyopia Primary Alveolar Hypoventilation Primary Amyloidosis Primary Biliary Cirrhosis Primary Hyperparathyroidism Primary Insomnia Primary Intestinal Pseudo-obstructi... Primary Lymphoma Of The Brain Primary Myelofibrosis Primary Or Secondary Fibrinolysis Primary Pulmonary Hypertension Primary Thrombocythemia Proctitis Proctitis - Streptococcal Progeria Progressive Multifocal Leukoencepha... Progressive Supranuclear Palsy Prolactinoma Prolactinoma - Males Prostate Cancer Prostate Cancer - Genetic And Other... Prostate Cancer - Resources Prostate Cancer In-Depth Prostatitis - Acute Prostatitis - Chronic Prostatitis - Nonbacterial Proximal Renal Tubular Acidosis Prune Belly Syndrome Pseudogout Pseudohypoparathyroidism Pseudomembranous Colitis Pseudotumor Cerebri Psittacosis Psoriasis Psoriasis - Guttate Psoriasis - Resources Psoriasis In-Depth Psoriatic Arthritis Psychosis Pterygium Ptosis Pubic Lice Pulmonary Actinomycosis Pulmonary Alveolar Proteinosis Pulmonary Arteriovenous Fistula Pulmonary Aspergilloma (mycetoma) Pulmonary Aspergillosis - Allergic ... Pulmonary Aspergillosis - Invasive Pulmonary Atresia Pulmonary Edema Pulmonary Embolus Pulmonary Nocardiosis Pulmonary Tuberculosis Pulmonary Valve Stenosis Pulmonary Veno-occlusive Disease Pyloric Stenosis Pyogenic Granuloma Pyogenic Liver Abscess Pyruvate Kinase Deficiency Q Fever Q Fever Early Stage Rabies Radial Nerve Dysfunction Radiation Enteritis Ramsay Hunt Syndrome Rapidly Progressive (crescentic) Gl... Rat-bite Fever Raynaud’s Phenomenon Reactive Attachment Disorder Of Inf... Rectal Prolapse Recurrent Cystitis Reflux Nephropathy Reifenstein Syndrome Reiter Syndrome Relapsing Fever Renal Renal And Urologic Disorders Renal Artery Stenosis Renal Cell Carcinoma Renal Papillary Necrosis Renal Vein Thrombosis Renovascular Hypertension Repeated Nightmares Respiratory Respiratory Acidosis Respiratory Alkalosis Respiratory Distress Syndrome (RDS)... Respiratory Syncytial Virus (RSV) Restless Leg Syndrome Restless Legs Syndrome And Related ... Restrictive Cardiomyopathy Retinal Detachment Retinal Vessel Occlusion Retinitis Pigmentosa Retinoblastoma Retinopathy Of Prematurity Retrocalcaneal Bursitis Retrograde Ejaculation Retroperitoneal Fibrosis Retroperitoneal Inflammation Retropharyngeal Abscess Retrosternal Thyroid Retroversion Of The Uterus Rett Syndrome Reye Syndrome Rh Incompatibility Rhabdomyolysis Rhabdomyosarcoma Rheumatic Fever Rheumatoid Arthritis Rheumatoid Arthritis In-Depth Rheumatoid Lung Disease Rheumatoid-collagen Disease Rhinophyma Rickets Rickettsial Pox Right-sided Heart Failure Riley-Day Syndrome Ringworm Rocky Mountain Spotted Fever Rosacea Roseola Rotator Cuff Tendinitis Rubella Rubinstein-Taybi Syndrome Rumination Disorder Ruptured Eardrum Russell-Silver Syndrome SVC Obstruction Salivary Duct Stones Salivary Gland Disorders Salivary Gland Infections Salivary Gland Tumors Salmonella Enterocolitis Sanfilippo Syndrome Sarcoidosis Scabies Scalded Skin Syndrome Scarlet Fever Scheie Syndrome Schistosomiasis Schizoaffective Disorder Schizoid Personality Disorder Schizophrenia Schizophrenia - Disorganized Type Schizophrenia - Paranoid Type Schizophrenia In-Depth Schizotypal Personality Disorder Sciatica Sclera Scleritis Scleroderma - Resources Scleroderma In-Depth Scleroma Sclerosing Cholangitis Scoliosis Scoliosis - Resources Scoliosis In-Depth Scrofula Scrotal Masses Scurvy Seasonal Affective Disorder Sebaceous Cyst Seborrheic Dermatitis Seborrheic Keratosis Secondary Amenorrhea Secondary Aplastic Anemia Secondary Hyperparathyroidism Secondary Parkinsonism Secondary Systemic Amyloidosis Selective Deficiency Of IgA Selective Mutism Senile Cerebral Amyloid Angiopathy Sensorimotor Polyneuropathy Separation Anxiety Sepsis Septal Hematoma Septic Shock Septicemia Serotonin Syndrome Sertoli-Leydig Cell Tumor Serum Sickness Severe Acute Respiratory Syndrome (... Sheehan Syndrome Shigella Enteritis Shingles And Chickenpox (Varicella-... Short Bowel Syndrome Sick Sinus Syndrome Sickle Cell Anemia Sickle Cell Disease In-Depth Silicosis Silicosis - Acute Simple Pulmonary Eosinophilia Sinusitis Sinusitis - Chronic Sinusitis In-Depth Sjogren Syndrome Skin Abscess Skin Cancer Skin Cancer Locations Skin Care And Incontinence Skin Lesion Of Coccidioidomycosis Skin Lesion Of Histoplasmosis Skin Sagging Treatment Skin Wrinkles And Blemishes In-Dept... Sleep Apnea Sleep Apnea In-Depth Sleep Disorders Sleep Disorders In The Elderly Sleep Walking Sleeping Sickness Sleepwalking And Children Slipped Capital Femoral Epiphysis Small Bowel Bacterial Overgrowth Smallpox Smoking In-Depth Social Phobia Solitary Pulmonary Nodule Somatization Disorder Somatoform Pain Disorder Spasmodic Dysphonia Spasmus Nutans Speech Disorders Spider Angioma Spinal Cord Abscess Spinal Cord Trauma Spinal Muscular Atrophy Spinal Stenosis Spinal Tumor Splenic Infarction Spondylolisthesis Spontaneous Pneumothorax Sporotrichosis Squamous Cell Skin Cancer Stable Angina Staph Aureus Food Poisoning Staphylococcal Meningitis Stasis Dermatitis And Ulcers Stereotypic Movement Disorder Stork Bite Strabismus Strep Throat Stress Gastritis Stress Incontinence Stroke Stroke In-Depth Stroke Related To Cocaine Use Stroke Secondary To Atherosclerosis Stroke Secondary To Cardiogenic Emb... Stroke Secondary To Carotid Dissect... Stroke Secondary To Carotid Stenosi... Stroke Secondary To FMD Stroke Secondary To Syphilis Strongyloidiasis Sturge-Weber Syndrome Stuttering Subacute Combined Degeneration Subacute Sclerosing Panencephalitis Subacute Thyroiditis Subarachnoid Hemorrhage Subareolar Abscess Subconjunctival Hemorrhage Subdural Effusion Subdural Hematoma Sudden Infant Death Syndrome Suicide And Suicidal Behavior Superficial Thrombophlebitis Supranuclear Ophthalmoplegia Swimmer's Ear Swimmer's Ear - Chronic Swimming Pool Granuloma Sydenham Chorea Syringomyelia Systemic Lupus Erythematosus Systemic Lupus Erythematosus In-Dep... Systemic Sclerosis (scleroderma) TMJ Disorders Taeniasis Takayasu Arteritis Tardive Dyskinesia Tay-Sachs Disease Temporal Arteritis Temporal Lobe Seizure Tendinitis Tennis Elbow Tenosynovitis Tension Headache Tension Pneumothorax Testicular Cancer Testicular Failure Testicular Infection Or Torsion Testicular Torsion Tetanus Tetralogy Of Fallot Thalassemia The Flu Thoracic Aortic Aneurysm Thoracic Outlet Syndrome Thromboangiitis Obliterans Thrombocytopenia Thrombophlebitis Thrombotic Thrombocytopenic Purpura Thrush Thyroid Cancer Thyroid Cancer - Papillary Carcinom... Thyroid Diseases Thyroid Nodule Thyrotoxic Periodic Paralysis Thyrotoxic Storm Tibial Nerve Dysfunction Tick Paralysis Tinea Capitis Tinea Corporis Tinea Versicolor Tongue Tie Tonsillitis Tooth Abscess Torticollis Total Anomalous Pulmonary Venous Re... Toxic Megacolon Toxic Nodular Goiter Toxic Shock Syndrome Toxic Synovitis Toxoplasmosis Tracheal/bronchial Rupture Tracheitis Tracheomalacia Trachoma Transfusion Reaction Transient Familial Hyperbilirubinem... Transient Ischemic Attack Transient Tachypnea - Newborn Transient Tic Disorder Transplant Rejection Transposition Of The Great Vessels Traumatic Injury Of The Bladder And... Traumatic Nasogastric Or Endotrache... Traumatic Pneumothorax Treacher-Collins Syndrome Tremor Trench Mouth Trichinosis Trichomoniasis Trichorrhexis Nodosa Trichotillomania Tricuspid Atresia Tricuspid Regurgitation Trigeminal Neuralgia Trisomy 13 Trisomy 18 Tropical Sprue Truncus Arteriosus Tuberculous Arthritis Tuberculous Pleural Effusion Tuberous Sclerosis Tularemia Tumor Turner Syndrome Type 1 Diabetes Type 1 Diabetes In-Depth Type 2 Diabetes Type 2 Diabetes Typhoid Fever Typhus UPJ Obstruction Ulcerative Colitis Ulcerative Colitis In-Depth Ulnar Nerve Dysfunction Umbilical Hernia Undescended Testicle Unilateral Hydronephrosis Unstable Angina Ureterocele Urethral Stricture Urethritis Urethritis - Chronic Urge Incontinence Urinary Incontinence In-Depth Urinary Tract Infection Urinary Tract Infection - Chronic O... Urinary Tract Infection In-Depth Urticaria Pigmentosa Uterine Fibroids Uterine Fibroids And Hysterectomy I... Uterine Prolapse Uveitis Uvulitis VIPoma Vaccine Reaction Vaginal Cysts Vaginal Tumors Vaginal Yeast Infection Vaginismus Varicocele Varicose Veins Vascular Spasm Vasomotor Rhinitis Venous Insufficiency Ventricular Fibrillation Ventricular Septal Defect Ventricular Tachycardia Vernal Conjunctivitis Vertebrobasilar Circulatory Disorde... Vertigo-associated Disorders Viral Arthritis Viral Encephalitis In-Depth Viral Gastroenteritis Viral Pneumonia Visceral Larva Migrans Vitiligo Volkmann’s Ischemic Contractu... 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Explains	why	arm	hair
stays	short,	but	hair	on
the	head	grows	long.	Includes
how	animals	shed	and	change
the	color	of	their	fur.

http://www.howstuffworks.com/question100.htm

Hair Growth Rate 2008 October

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Explains why arm hair stays short, but hair on the head grows long. Includes how animals shed and change the color of their fur.

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