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.
- 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)
Find an Expert
- Evaluation and Treatment of Hirsutism in Premenopausal Women (Hormone Health Network) - PDF
- Hirsutism and Polycystic Ovarian Syndrome (American Society for Reproductive Medicine) - PDF