Boys abdominal hair may be a normal performance, consider and genetic factors, androgen secretion, may also be caused by certain diseases. 1. Hereditary factors: abdominal hair is more vigorous, consider and hereditary related, such as father and family grandparents, abdominal hair is more, by the influence of genetic factors, abdominal hair growth is more exuberant. 2. Exuberant secretion of androgens: Hormone levels change during puberty, androgens are more abundant in the body, which may lead to an increase in body hair in the armpits, abdomen and back. 3. Disease: In addition to the more vigorous growth of body hair, it is also accompanied by acne, full moon face, buffalo back, it is recommended to pay attention. You can go to the hospital for a relevant examination to find out whether it is related to Cushing’s syndrome, which causes increased body hair. To summarize, increased body hair may be caused by physiological factors or certain diseases. If you suspect that the increase in body hair is caused by a disease, it is recommended that you consult a doctor in time and take the doctor’s advice into account.