Simple excessive back sweating may be an individual difference, or it may be a sympathetic nerve injury. The distribution of sweat glands in the human body is not very balanced, usually more sweat glands in the head, neck and chest, but there are some people who have developed sweat glands in the back due to developmental abnormalities, and this kind of back sweating belongs to physiological activities. The secretion of sweat glands is controlled by sympathetic nerves, and the sympathetic nerves of the back sweat glands come from the sympathetic ganglion of the cervical medulla, if there is a tumor or inflammation in the cervical medulla, it will easily lead to the sympathetic nerve dysfunction of the back, and symptoms such as excessive sweating will occur. In addition, calcium deficiency is also likely to induce increased sympathetic excitability, excessive sweating, you can do a serum electrolyte test to rule out calcium deficiency. If necessary, do an MRI of the cervical medulla and routine examination of the cerebrospinal fluid to exclude cervical medulla tumors or inflammation.