Sweating tends to occur at night while sleeping if the ambient temperature is high and hot, especially in summer. Especially in the area at the back of the neck, because of the contact with the pillow, breathability is not good, easy to appear neck sweating, if it is simply because of environmental factors caused by sweating, often do not need special treatment. You can blow an electric fan or turn on the air conditioner to lower the ambient temperature and provide a comfortable sleeping environment. If there is lateral neck sweating, there are some patients who will have abnormal lateral limb sweating if there is a plant nerve disorder or if there is a brain lesion that causes the patient to develop Horner’s syndrome, and these patients need to be seen in the hospital.