Sweating in small children can be caused by physiological reasons, tuberculosis and vitamin D deficiency. 1. Physiological reasons: small children are in the period of growth and development, metabolism is fast, if the activity is large, the body will produce more heat, appear often sweating, is a physiological phenomenon. 2. Tuberculosis: when a child suffers from tuberculosis, it causes abnormalities in the thermoregulatory center, resulting in easy sweating, and is accompanied by fever, fatigue and other symptoms. 3. Vitamin D deficiency: small children grow and develop faster, if the body has vitamin D deficiency, it may lead to rickets, causing easy sweating phenomenon, accompanied by occipital baldness, night terrors and other symptoms. Children sweat easily after excluding physiological reasons. Parents should take their children to the hospital in time, improve the examination to clarify the cause of the disease, and then actively treat.