Cold and sweaty feet under the covers indicate that the patient’s peripheral circulation is poor, which leads to a lower skin temperature of the feet, accompanied by sweaty hands and feet, so the patient’s feet even under the covers feet sweat, but the skin temperature is cool. If the feet are in a wet, cold environment for a long time prone to frostbite, these patients often suffer from hyperhidrosis of the hands and feet. Sweat is a liquid secreted by sweat glands, distributed in the hands and feet are mainly small sweat glands, small sweat glands to the palm and plantar and axillary part of the most abundant, small sweat glands directly open in the skin surface, mainly by the cholinergic nerve innervation. The causes of hyperhidrosis are generally organic diseases and functional disorders, the former is seen in endocrine disorders, such as hyperthyroidism, diabetes mellitus, neurological disorders or infections during or after the infection process. Functional hyperhidrosis is generally characterized by more psychogenic sweating, by highly emotional stimuli, like tension, suspense, pain, fear, etc.. The hands and feet are the richest area of small sweat glands, when unexplained excessive tension, excitement, stress, etc. are prone to cause an abnormal increase in sweating of the hands and feet. For patients with poor blood flow in the feet, poor peripheral circulation, and the performance of the foot skin even if excessive sweat, but the skin temperature is still cold, so patients should pay attention to local warmth, shoes and socks should be kept loose, etc., the treatment of hyperhidrosis of the feet can be used with a variety of inhibition of secretion of sweat glands of topical medicines external coating or soaking.