The so-called armpit odor is a special kind of odor emitted from the armpit, also known as fox odor, armpit gas. This is a special pungent odor, more pronounced in summer. Most occur in the armpits, a few people can also emit this odor from the vulva, perianal and areola. This unpleasant odor often affects the patient as well as the surrounding population. Armpit odor does not exist in everyone, so why do some people have armpit odor? We need to start with the causes of armpit odor to understand this problem. The causes of armpit odor are as follows: 1, the influence of genetic factors, if both parents suffer from armpit odor, the chances of the child suffering from armpit odor is about 80%, if one parent has armpit odor, then the chances of inheritance is 50%. It can be seen that genetics is the main cause of armpit odor. 2, the impact of mental factors, because the human body in a state of tension will sweat, too much sweat will lead to the human body, the body emits an unpleasant smell, the folds are particularly prone to breeding bacteria and fungi, so anxiety and tension, is easy to appear armpit odor. 3, the impact of endocrine factors, the human sweat gland is a greater relationship with the individual’s endocrine system, in adolescence, the sweat gland began to be active, and the sweat gland will cause the body to appear sweat odor symptoms, with the growth of age, the sweat gland activity will decline, then the symptoms of armpit odor will also be reduced. 4, poor hygiene habits, some people do not love hygiene, usually do not bathe, then the folds on the body, such as the armpits, etc., will give off a very unpleasant smell, and over time it is easy to induce armpit odor. 5, the sweating factor, the human sweat glands are too developed will appear a lot of sexual sweating, and sweat with a very special odor, and then after the human skin surface of the bacteria and fungal decomposition will give off odor. It can be seen that only some people will have these conditions, so some people will have armpit odor, while most people are not.