Fingernail biting in children is usually a result of micronutrient deficiencies, most commonly zinc, iron, and calcium deficiencies, but it can also just be a behavioral problem.
Fingernail biting in children is a very common behavior that can be caused by a lack of micronutrients. Clinical studies have shown that it is more common to be deficient in zinc, iron, calcium and other trace elements. Parents can first take their children to the hospital for a trace element checkup to clarify the type of trace element that is deficient and the degree of deficiency, and then make targeted supplements.
If it is clear that the child bites the fingernails because of the lack of certain trace elements, you can use the appropriate drugs to supplement the treatment, but generally recommended through dietary therapy to correct the lack of trace elements. For example, eat more deep-sea fish to supplement zinc; eat more meat, fish, shrimp to supplement calcium; eat more animal liver and lean meat to supplement iron, all therapies need to follow the doctor’s instructions, so as not to cause adverse effects.