Why don't men have hair under their armpits?

Armpit hair grows under the armpits, which not only dissipates heat, but also reduces friction in the wrinkled parts and avoids discomfort. Adults have hair under their armpits. As the human body evolves, the armpit hair becomes less and less, and some people even have no armpit hair. In life, many people use various methods to remove armpit hair. For people who don't have armpit hair, it's much easier. So why don't some people have armpit hair?

1. The main reason why boys don't grow armpit hair is that girls contain a large amount of testosterone in their bodies, so the skin under the armpits is insensitive to the sex hormone testosterone or has no reaction, resulting in the lack of armpit hair. Or it may be that boys are born without ovaries or have ovarian hypoplasia and other diseases. If the second situation occurs, you should go to the hospital for diagnosis in time.

2. It is normal for boys not to have armpit hair. Some boys are born without armpit hair. This has a lot to do with their own physical constitution and hormone levels in the body. It is not an abnormal phenomenon. If you don't feel any discomfort in your body, you don't have to worry. Armpit hair usually grows slowly during boys' puberty.

3. Armpit hair is a secondary sexual characteristic of females. The growth of armpit hair is the result of the adrenal glands secreting androgen. Armpit hair appears about two years later than pubic hair, and generally grows around the age of 15. Having armpit hair is a sign of puberty. Having armpit hair can prevent bacterial growth and relieve skin friction.

Note:

Under normal circumstances, everyone will grow some armpit hair, which usually occurs during puberty. It is a secondary sexual characteristic and a sign that one has entered puberty. Most people will have armpit hair, which can better help the evaporation of sweat. The growth of armpit hair is closely related to the body's male and female hormones. Having armpit hair can better relieve friction between the skin and absorb sweat. However, in daily life, some people do not grow armpit hair.

Once armpit hair grows under the armpits, the armpits will often sweat, so they should be cleaned in time. If they are not cleaned in time, a smell called body odor will gradually develop. Therefore, you should take a bath and change your clothes frequently, and try not to cut your armpit hair to harm your health.

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