Frequent sweating at the base of the thighs may be caused by physiological factors such as improper clothing, exercise or diseases such as hyperhidrosis. 1. Physiological factors: including fat distribution in the thigh area, clothing is too tight and airtight, exercise, local hygiene and cleanliness, etc., may lead to the thigh root temperature increases, airtight, thus triggering the symptoms of sweating. 2. Hyperhidrosis: Hyperhidrosis may be related to diseases, medications, heredity and other factors, generally divided into generalized hyperhidrosis and limited hyperhidrosis, limited hyperhidrosis occurs in the palms of the hands, soles of the feet, armpits and perineum, when the perineum area of the sweating abnormally increased, the sweat will flow down to the root of the thighs or other parts of the thighs, and at the same time may be accompanied by odors, white or erythema and other skin impregnation symptoms. Frequent sweating at the base of the thighs may also have other causes, it is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease and then give targeted treatment.