Is it normal to not have underarm hair?
Jul 16, 2025
Source: Cainiu Health
Dr. Liu Wenmin
Introduction
In general, the absence of underarm hair is usually a normal physiological phenomenon, but in rare cases, it may be related to pathological factors. Underarm hair growth is primarily regulated by genetic and hormonal factors. If parents have sparse or absent underarm hair, their children are more likely to exhibit a similar pattern, which is considered a familial hair distribution characteristic and typically requires no special treatment. However, if it is accompanied by underdeveloped gonads, further medical evaluation is necessary.
In general, the absence of underarm hair is usually a normal physiological phenomenon, but in rare cases, it may be related to pathological factors. A detailed analysis is as follows:
Underarm hair growth is primarily regulated by genetics and hormone levels. If a person's parents have sparse or absent underarm hair, their children are more likely to exhibit a similar pattern, which is considered a familial hair distribution characteristic and typically requires no special treatment. Additionally, although androgen levels during puberty initiate underarm hair growth, some individuals may have sparse or absent underarm hair due to lower sensitivity of hair follicles to androgens. In such cases, if other secondary sexual characteristics are normal, it suggests normal endocrine function.
However, if the absence of underarm hair is accompanied by underdeveloped gonads, such as primary amenorrhea or lack of breast development, or if there is an androgen synthesis disorder, such as low libido or abnormal genital development, it may indicate an underlying abnormality that requires attention.
It is important to maintain good lifestyle habits and proper local hygiene in daily life to prevent discomfort.
