The common reasons why the human body does not sweat much are as follows: 1. The human body does not sweat much may be caused by congenital underdeveloped sweat glands. Patients with congenital underdeveloped sweat glands usually show symptoms of localized or generalized underdeveloped sweating. 2. The human body does not sweat much may also be caused by certain undesirable skin diseases, such as ichthyosis, leprosy and skin atrophy. The human skin’s sweat glands are damaged, and the damage to the human skin’s sweat glands will cause the skin to be unable to secrete sweat. 3, the human body does not sweat much may also be caused by certain internal hidden diseases, such as uropathy, malignant tumors, mucus edema, etc. These internal hidden diseases will cause the human body to be unable to excrete sweat normally through the sweat glands, thus causing the human body to not sweat much.