Children eating nails may be due to bad habits, psychological factors, abnormal trace elements and other reasons. 1. Bad habits: children imitate nail eating to people around them, such as kindergarten children. When a child is lonely and has no other entertainment such as toys, he or she may bite nails for self-entertainment. 2. Psychological factors: When the child is overstressed and his emotional needs are not met, bad habits such as nail biting may also occur. 3. Abnormalities of trace elements: for example, iron deficiency, zinc deficiency, lead poisoning, etc., may cause xerophagia in children, and nail biting may also occur, accompanied by behavioral and emotional disorders. Children eating nails, there may be other reasons, 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.