Sweating at dawn can be caused by perimenopausal syndrome, hypoglycemia, hyperthyroidism and other causes. 1. Perimenopausal syndrome: generally refers to the menopausal stage of the female body estrogen, progesterone levels will change, and the autonomic nervous system function will occur to a certain degree of disruption, thus appearing to dawn body sweating. 2. Hypoglycemia: generally refers to the occurrence of hypoglycemia, which causes excessive secretion of adrenaline and norepinephrine, resulting in sympathetic excitation, which may be accompanied by panic, hunger, and so on, resulting in sweating at dawn. 3. Hyperthyroidism: generally due to increased synthesis and secretion of thyroid hormones in the body, the body is in a high metabolic state, thus appearing to dawn sweating, there may also be a fear of heat, hyperphagia, increased stool frequency, emaciation and so on. These are only some of the common causes. Dawn body sweating need to go to the hospital in time, under the guidance of the doctor’s instructions for standardized treatment.