Ear hair growth, like the growth of other terminal hairs on the body, is primarily driven by hormones called androgens. According to dermatologist Matthew Stephany, MD, hair in areas such as the ears, scalp, underarms, groin, eyebrows, and nostrils are all terminal hairs, and their growth is regulated by these hormones.
The Role of Androgens
Androgens are a group of hormones, including testosterone, that play a crucial role in the development and maintenance of male characteristics, including hair growth. The sensitivity of hair follicles to androgens varies in different parts of the body due to unique receptors that bind to these hormones.
- Androgen Receptors: These receptors are present on hair follicles and determine how they respond to androgens.
- Differential Sensitivity: Follicles in the ears, for example, may be more sensitive to androgens than follicles on the scalp. This is why some men experience hair growth in their ears as they age, even while experiencing hair loss on their head.
Why Does Ear Hair Increase with Age?
Generally, ear hair tends to become more noticeable as men age. This is because:
- Increased Androgen Levels: While testosterone levels may decline slightly with age, the sensitivity of hair follicles in the ears to androgens can increase.
- Cumulative Effect: Over time, even a constant level of androgens can stimulate more hair growth in sensitive areas like the ears.
Summary
In summary, ear hair growth is primarily determined by the presence and action of androgen hormones on hair follicles in the ears, with sensitivity to these hormones playing a significant role. As people age, especially men, increased sensitivity and cumulative effects of androgen exposure can lead to more noticeable ear hair.
