Leg hair grows exuberant for a variety of reasons, including physiological factors, genetic factors, disease factors and so on. 1. Physiological factors: some patients due to the androgen secretion of the body is more exuberant, resulting in leg hair growth is more exuberant, belong to the more normal physiological phenomenon, generally do not need to carry out special treatment. 2. Hereditary factors: some patients are more vigorous leg hair, considering and genetic factors, especially both parents have the phenomenon of vigorous leg hair, then their offspring will also increase the chance of vigorous leg hair. 3. Disease factors: In addition to some of the diseases, can also lead to exuberant growth of leg hair, more common female polycystic ovary syndrome, can lead to androgen secretion, thus causing more leg hair growth. So once the leg hair is too exuberant, it is best to go to the hospital in time to find out the cause of the disease, and then treatment.