Sweating at night belongs to the category of hyperhidrosis, normal people after physical labor, sweating in hot days, high temperature environment are normal physiological phenomena. When the skin sweat excretion is too much, called hyperhidrosis, can be caused by a variety of reasons, confined to a certain part or generalized sweating. Sweat is secreted by sweat glands, sweat glands can be divided into sweat glands and sweat glands, sweat glands are only seen in a few parts of the sweat glands, sweat glands in the human skin, in addition to the red edge of the lips, nail beds, labia minora, glans, and the inner side of the foreskin, visible everywhere to the palms and metatarsals and armpits are the most abundant. The sweat glands open directly on the skin surface and are mainly innervated by cholinergic nerves. Patients who sweat a lot in bed at night often have hyperhidrosis of the small sweat glands, which can be generalized or confined to a certain area, while restricted hyperhidrosis occurs in the armpits or palmar-plantar or pressurized areas. Patients should first carefully look for the cause of their excessive sweating, identifying any emotional changes, changes in body position, or an environment that is too hot. Find out if it is caused by certain diseases, such as infection with hyperthermia, oral antipyretic drugs, endocrine disorders, tuberculosis and other factors. When sweating in bed at night, others its called night sweats, which is thought to be related to tuberculosis. Therefore, it is recommended that patients should first get rid of environmental, physiological and emotional factors, and if necessary, go to the hospital after a series of tests to clarify the diagnosis.