Sweating in the neck at night may be caused by physiological factors such as overheating of the environment and over-thickness of the blanket, or it may be caused by other factors such as hyperthyroidism, autonomic dysfunction, and diabetes mellitus. 1. Physiological factors: If the ambient temperature is too high at night, or if you sleep under too thick a blanket, it may lead to increased sweating. At this time, there will be a large number of symptoms of sweating in the neck at night, which is a normal physiological phenomenon and does not require treatment. 2. Hyperthyroidism: Hyperthyroidism may be caused by thyroid tumor, diffuse toxic goiter and so on. Patients will have excessive sweating, hand tremor, irritability and so on. Therefore, patients will have the symptom of profuse sweating on the neck when they sleep at night. 3. Autonomic dysfunction: Autonomic dysfunction may be caused by mental tension, excessive pressure, heredity and so on. Patients may show forgetfulness, stomach distension, panic, sweating, dizziness, etc. Therefore, patients may have profuse sweating on the neck when they sleep at night. 4. Other: Patients’ heavy neck sweating at night may also be caused by diabetes, malignant tumor, Parkinson’s disease and other factors. For the exclusion of physiological factors lead to night sleep neck sweating, patients need to consult a doctor in time, the doctor will be for the cause of the treatment.