Men with less body hair may be related to heredity, androgen reduction, disease and other factors. 1. Heredity: the amount of body hair is generally related to genetic predisposition, such as family genetic body hair, their offspring body hair will also be more, in addition, with the ethnicity of the gene is also related to the white body hair is relatively more, and the yellow body hair is relatively sparse. 2. Androgen reduction: the amount of body hair and androgen levels, when the male androgen secretion is reduced, may cause relatively less body hair, such as before puberty, the human body hair is not obvious. 3. Disease: Men with less body hair may be associated with endocrine diseases, such as hypothyroidism, etc.; genetic lesions, such as Crohn’s syndrome and other diseases caused. In addition, if the patient suffered from viral mumps as a child, resulting in testicular inflammation complications, affecting the secretion of androgen, may also cause less body hair. It is recommended that patients seek timely medical examination, clear causes for targeted treatment, maintain a good mood in life, such as the emergence of other uncomfortable symptoms, should be timely medical treatment.