Children’s back sweating may be a physiological phenomenon, or vitamin D deficiency, hyperthyroidism and other diseases. 1. Physiological phenomenon: if the child is in a long time in the high temperature, high humidity environment, affecting the body heat dissipation, will increase the amount of sweating, the occurrence of back sweating, but also with strenuous exercise. 2. Vitamin D deficiency: the occurrence of this disease is related to insufficient sunlight hours, vitamin D synthesis disorders or insufficient intake of other reasons, including gastrointestinal malabsorption, lactose intolerance, excessive sunscreen and other factors. Typical symptoms include nocturnal awakening, irritability and excessive sweating, which may be manifested as excessive sweating on the back of the child. 3. Hyperthyroidism: This disease is caused by overactive thyroid function, resulting in increased synthesis and secretion of thyroid hormones, and is associated with thyroid nodules, excessive iodine intake and other factors. Affected children will have symptoms such as tachycardia, fatigue and excessive sweating, so there will be the manifestation of excessive sweating on the back of children. 4. Other: In addition, in the clinical need to consider the primary hyperhidrosis, tuberculosis and other diseases caused. Children’s back sweating, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.