Children like to bite their nails to consider with the habit related, may also be mental stress, micronutrient deficiency and other factors. 1. Habits, children usually like to imitate the behavior of others, long-term imitation may form a habit, so there will be like biting nails symptoms. 2. Mental stress, usually children’s mental stress is relatively large, psychological tension, may appear like biting nails, which can divert attention. 3. Trace element deficiencies, if the children’s body trace element deficiencies, such as zinc, iron, selenium, etc., may lead to children’s sense of taste abnormalities, so this symptom will appear. Children like to bite their 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.