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.
Prevention and Risk Factors
- Tips for Healthy 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 Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: Folliculosebaceous neoplasms: A review of clinical and histological features.
- Article: Recurrent spontaneous subserosal hematoma of ileum causing intestinal obstruction in...
- Article: Use of silicon for skin and hair care: an approach...
- 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
- Aging changes in hair and nails (Medical Encyclopedia) Also in Spanish
- Dry hair (Medical Encyclopedia) Also in Spanish
- Excessive or unwanted hair in women (Medical Encyclopedia) Also in Spanish
- Folliculitis (Medical Encyclopedia) Also in Spanish
- Trichorrhexis nodosa (Medical Encyclopedia) Also in Spanish