Anal hair growth is generally a physiological phenomenon and occurs in both men and women. Adult men usually have thicker anal hair than adult women, and people generally have less hair in places with hot weather. Most of the body hair growth areas such as the anus are hereditary, which is related to the local climate. In addition, anal hair and human endocrine has a great relationship, generally speaking, adults have hair in the anus, anal hair can make the anus keep ventilation, but also to invade the liver of bacteria discharge, to prevent bacterial infection. But some people around the anus too thick anal hair, can make the stool bacteria attached to the anal hair, so the anal hair is a normal physiology, this do not worry, if you feel inconvenient, you can carry out laser cosmetic surgery or hair removal.