Sweating below the buttocks at night can be caused by physiologic or pathologic reasons. Physiological phenomenon can be seen in hot weather, etc., pathological causes are mostly seen in eczema, etc.. 1. Hot weather: Sweating below the buttocks at night is not excluded and hot weather has a direct relationship, especially for some people who are not easy to move the patient, it is easy to cause sweating below the buttocks. Just open the window to ventilate or through the air conditioning to reduce the indoor temperature. 2. Eczema: The cause of eczema is still unclear, and may be related to internal and external factors as well as psychosocial factors. Eczema can have symptoms such as edema, erythema and papules in the acute stage; in the subacute stage, it can have symptoms such as redness, swelling and oozing reduction, crusting and flaking; in the chronic stage, it can have symptoms such as rough and thickened skin and mossy changes. These are only some of the common causes. When you sleep at night below the buttocks with persistent sweating symptoms, you should go to the hospital in time for relevant examinations, early detection of the cause as soon as possible treatment, patients should follow the doctor’s instructions for standardized treatment.