Nail biting in children is mostly related to psychological reasons and nutritional deficiencies, it is recommended to consult a professional doctor for timely treatment. Common causes 1, psychological reasons: the child’s personality is more introverted, due to the pressure of learning, scolding, and the impact of the family atmosphere of disharmony, often in a tense, worried mood, may trigger nail biting behavior; some children may imitate the behavior of others, or by the transformation of the thumb-sucking habit; 2, lack of nutrition: long-term partiality, picky eating, resulting in the lack of micronutrients, such as iron, zinc deficiency, can lead to Ectophagia, nail biting, wallpaper biting, soil eating and other abnormal behaviors. Treatment 1, daily intervention: cultivate children’s interests and hobbies, and divert children’s attention; 2, aversion therapy: smear difficult or children do not like to eat food on the nails, and correct the habit of biting nails; 3, psychological intervention: consult professional psychologists, and conduct psychological counseling; 4, medication: if the nail biting is due to iron and zinc deficiencies, improve the micronutrient examination, and you can take appropriate supplements of iron, Zinc, zinc supplement can be oral zinc gluconate, iron supplement can be oral ferrous sulfate oral solution. Improve daily dietary habits, pay attention to balanced nutrition, eat more food rich in calcium, zinc and other trace elements, such as fish, milk, walnuts, apples and so on. Provide the child with a warm, comfortable growing environment, avoid scolding, and properly accompany the child to outdoor activities.