Axillary hair

Underarm hair
Details
Identifiers
Latin	hirci
TA	A16.0.00.021
FMA	70756
Anatomical terminology []

Underarm hair, also known as axillary hair, is the hair in the underarm area (axilla).

Underarm hair, as human body hair, normally starts to appear at the beginning of puberty, with growth usually completed by the end of the teen-age years.

Axillary hair goes through 4 stages of development, driven by weak androgens produced by the adrenal in males and females during adrenarche, and testosterone from the testicle in males during puberty. Like Tanner Staging for pubic hair, axillary hair can be staged according to the staging system, named for Pediatric Endocrinologist, Dr. Joseph Wolfsdorf, as follows:

Staging a patient's axillary hair will allow the physician to track the child's development longitudinally.

The evolutionary significance of human underarm hair is still debated. It may naturally wick sweat or other moisture away from the skin, aiding ventilation. Colonization by odor-producing bacteria is thereby transferred away from the skin (see skin flora).

Today in much of the Western world, it is more common for women to regularly shave their underarm hair, but this practice is uncommon among men. The prevalence of this practice varies widely, though. Religious reasons are sometimes cited; for example, some in Islamic culture, both men and women remove underarm hair to meet religious guidelines of cleanliness. Removal of underarm hair was part of a collection of hygienic or cosmetic practices recommended by Muhammad (570-632) as consistent with fitra for both women and men and has since usually been regarded as a requirement by most Muslims. In much of the Western world, men also choose to remove their underarm hair for aesthetic reasons.

Many competitive swimmers remove nearly all of their body hair, including their underarm hair, believing it makes their bodies more streamlined during races. Many male bodybuilders also remove their body hair for cosmetic purposes.

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