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Skin > Skin (Dermatology) > Hair disorders

Hair disorders

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Hair disorders may occur when excessive amounts of hair grow or fall out. They may also occur if the hair lacks pigment in certain areas or if the hair becomes gray prematurely. These conditions can be temporary or permanent, depending on the cause.

There are many potential causes of hair disorders, ranging from immune disorders and genetics to illnesses and medications. For many, abnormal hair loss or growth is not a major health concern, although some individuals may feel self conscious or have a difficult time coping with their appearances. Sometimes a hair disorder is a sign of an underlying health condition, such as a nutrient deficiency, a hormonal disorder (such as an adrenal disorder), metabolic disturbances, or a fungal infection of the scalp.

In healthy individuals, hair of varying length and thickness grows all over the body except for the palms of the hands, soles of the feet, and lips. Most of the hairs on the scalp do not grow individually. Instead, they grow in clusters, called follicular units, of 1-5 hairs. Each hair has its own oil gland.

It generally takes about four months for healthy hair (on the head) to grow one inch. Most hairs on the head grow 4-6 years before falling out. In contrast, hair on the arms, legs, eyelashes, and eyebrows only grows for about 30-45 days, which is the hair is so much shorter than the hair on the scalp.

It is normal for some hair to fall out each day. It is estimated that adults lose 50-150 hairs on the head each day. Once a hair falls out, new hair grows in its place. Hair growth may be less noticeable in patients with curly hair or in people with lighter-colored hair. As individuals age, most people experience hair thinning or loss. It is also common for the hair to become gray or white and dry, coarse, and/or wiry.

Related Terms

Abnormal hair loss, alopecia, alopecia areata, androgenetica alopecia, bald, balding, baldness, bleaching, body hair, coarse hair, depilatory, electrolysis, facial hair, hair, hair growth, hair loss, hair restoration, hair transplant, hyperandrogenism, hypertrichosis, ingrown hair, laser therapy, plucking, shaving, threading, telogen effluvium, waxing, white hair, wig.

Natural Standard Bottom Line Monograph, Copyright © 2009 (www.naturalstandard.com). Commercial distribution prohibited. This monograph is intendedfor informational purposes only, and should not be interpreted as specific medical advice. You should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

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