The phenomenon of sweating during sleep and stopping after waking up is called “night sweating”. Night sweats is the name of a disease in Chinese medicine, which is characterized by abnormal sweating after going to sleep and stopping after waking up. “The ancient medical practitioners used thieves to describe the disease with sneaky activities at night every day, whenever people fall asleep, or just a closed eyes and will fall asleep, sweat like thieves secretly leaked out. Some children sweat mainly in the first half of the night after they fall asleep, which is often caused by low blood calcium. Low calcium tends to make the sympathetic nerves more excitable, as if opening the sweat gland “faucet”, this situation is especially common in children with rickets. However, night sweats are not unique to rickets, but should be analyzed based on the child’s feeding and outdoor activities, as well as blood calcium, blood phosphorus and wrist bone x-ray to determine whether the child has active rickets. The majority of patients with mild night sweats have sweats that come out easily when they are deep asleep, or at about 5:00 a.m. or 1 to 2 hours before waking up, and the amount of sweat is small. Usually there is no discomfort. The majority of patients with medium type night sweats, sweat can be released soon after going to sleep, or even make sleepwear wet, sweat will stop after waking up, wipe the sweat from the body, and then go back to sleep that is no longer sweating. In this type of night sweats, patients often have a sense of baking heat, hot as sweat, and sometimes have a dry mouth and throat after waking up. In patients with severe night sweats, sweat is easily released. Soon after going to sleep or just close your eyes when you are about to go to sleep, that is, there is a large amount of sweat night gush, sweat can wake up, after waking up sweat can suddenly converge. When you go back to sleep, you can sweat again. Sweating, sweat often with a light salty smell, or sweating at the same time mixed with sweat odor. The sweating can make the bedding wet, not several times a night to replace the sleeping clothes can not sleep peacefully, there are individual patients with heavy evidence can make the bedding wet, thin bedding or with a mat, sweat can be printed on the bed board sweat stains. These patients are often accompanied by a pronounced feeling of baking heat, and their mood also shows irritability, dry mouth after sweating, and a preference for cool water. Usually, it may be accompanied by low fever or hot flashes, five heartburn, red cheekbones, dizziness, emaciation, fatigue, dark urine, low urine volume, and dry stools. Light and medium night sweats do not cause too much damage to the body, but heavy night sweats often worsen over time and develop into “desiccation”, seriously threatening the patient’s health and life safety. For children with pathological night sweats, treatment should be directed at the cause. If the sweating is caused by calcium deficiency, calcium, phosphorus and vitamin D should be supplemented appropriately, and the following points should be done: 1. Can be outdoors, not through the glass sun. 2, strongly advocate mother’s milk feeding. 3, premature babies, twins, children with frequent diarrhea or other gastrointestinal diseases should pay attention to the addition of vitamin D. 4, rural areas in the north or cold areas should be planned to take the “summer sunshine, eat D in winter” measures to prevent rickets. For night sweats caused by tuberculosis, regular anti-tuberculosis treatment should be carried out under the guidance of a doctor.