Frequent hand eating may be a physiological phenomenon, or it may be caused by zinc deficiency, iron deficiency anemia and other diseases. 1. Physiological phenomenon: frequent eating of baby’s hands is mostly considered to be caused by physiological factors such as insufficient feeding and insecurity, which can be gradually relieved with age. 2. Zinc deficiency: the common causes of this disease include insufficient zinc intake, increased need, intestinal absorption obstacles, genetic defects, excessive loss of zinc, etc. The common symptoms are anorexia, growth and development backwardness, xenophagia, etc., and some of the affected babies will appear to eat their hands frequently. 3. Iron deficiency anemia: the occurrence of this disease is related to insufficient iron intake, increased iron demand, excessive iron loss and other reasons. Typical symptoms include xerostomia, inattention, irritability, and xerophagia, which can be manifested as frequent hand eating in affected children. Frequent eating of hands may have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.