The average person has 5 million hairs. Hair grows all over your body except on your lips, palms, and the soles of your feet. It takes about a month for healthy hair to grow half an inch. Most hairs grow for up to six years and then fall out. New hairs grow in their place.
Hair helps keep you warm. It also protects your eyes, ears and nose from small particles in the air. Common problem with the hair and scalp include hair loss, infections, and flaking.
Prevention and Risk Factors
- Tips for Healthy Hair (American Academy of Dermatology)
- African-American Hair: Tips for Everyday Care (American Academy of Dermatology)
- Dandruff (Mayo Foundation for Medical Education and Research)
- Hair Dye and Hair Relaxers (Food and Drug Administration) Also in Spanish
- How to Shave (American Academy of Dermatology)
- How to Stop Damaging Your Hair (American Academy of Dermatology)
- Genetics Home Reference: autosomal recessive hypotrichosis (National Library of Medicine)
- Genetics Home Reference: keratoderma with woolly hair (National Library of Medicine)
- Genetics Home Reference: monilethrix (National Library of Medicine)
- ClinicalTrials.gov: Hair Diseases (National Institutes of Health)
Journal ArticlesReferences and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: IMAGES IN CLINICAL MEDICINE. Acanthosis Nigricans and Insulin Resistance.
- Article: Identifying Mutations of the Tetratricopeptide Repeat Domain 37 (TTC37) Gene...
- Article: Case Report: Bazex Syndrome Associated With Pulmonary Adenocarcinoma.
- Hair Problems -- see more articles
- Hair restoration -- see more articles
- Evaluation and Treatment of Hirsutism in Premenopausal Women (Hormone Health Network) - PDF
- Hirsutism and Polycystic Ovarian Syndrome (American Society for Reproductive Medicine) - PDF