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From Wikipedia, the free encyclopedia

Classification and external resources

Alopecia in 33 yr. old male.
ICD-10 L65.9
ICD-9 704.09
DiseasesDB 14765
MedlinePlus 003246
MeSH D000505

Alopecia or hair loss is the medical description of the loss of hair from the head or body, sometimes to the extent of baldness. Unlike the common aesthetic depilation of body hair, alopecia tends to be involuntary and unwelcome, e.g., androgenic alopecia. However, it may also be caused by a psychological compulsion to pull out one's own hair (trichotillomania) or the unforeseen consequences of voluntary hairstyling routines (mechanical "traction alopecia" from excessively tight ponytails or braids, or burns to the scalp from caustic hair relaxer solutions or hot hair irons).

In some cases, alopecia is an indication of an underlying medical concern, such as iron deficiency.[1]

When hair loss occurs in only one section, it is known as alopecia areata. Alopecia universalis is when complete hair loss on the body occurs, similar to how hair loss associated with chemotherapy sometimes affects the entire body.[2]



Latest research

In May 2009, researchers in Japan identified a gene, SOX21, that appears to be responsible for hair loss in humans.[5]

See also


External links



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