Sweating in bed has little relation with tumor, it may be caused by stuffy heat, low blood sugar, low blood calcium and so on. 1. Stuffy heat: too high temperature at night, elevated room temperature in the morning, covering the quilt to sleep, etc. will lead to overheating of the human body or the surrounding environment, and the physiological phenomenon of the body’s self-regulation of body temperature may be manifested as sweating, which is a normal reaction. 2. Hypoglycemia: If diabetic patients use hypoglycemic drugs before going to bed at night, and the hypoglycemic drugs, after use, will play a role in the night, it is easy to let the blood glucose drop too much, and the night hypoglycemia, and hypoglycemia at night is easy to let the body sweat a lot. 3. Low blood calcium: If the sweating time is mainly in the middle of the night after the patient goes to sleep, it is usually caused by low blood calcium. Low calcium will increase the excitability of sympathetic nerves, increase the secretion of sweat glands, such a phenomenon of sleep sweating is more common in rickets patients. Sleep sweating is not a cause for anxiety, but if it is not relieved for a long time, it is recommended to go to the hospital for examination and treatment under the guidance of the doctor.