What causes children to bite their fingernails?

Children love biting fingernails, considering the bad habits or emotional tension and other physiological factors, but also may be a fetishism, obsessive-compulsive disorder and other diseases caused.
1. Physiological factors: children love biting fingernails for a variety of reasons, may be habitual nail biting, may also be emotional tension, emotional needs are not satisfied, through biting fingernails to relieve tension and pressure.
2. Ectophagia: the etiology of ectophagia is unknown, may be related to the lack of certain nutrients in the child’s body, mainly manifested in the patient will eat non-food and non-nutritious substances, such as hair, paint, paper, nails, etc., often accompanied by behavioral and emotional disorders.
3. Obsessive-compulsive disorder (OCD): the causes of OCD are many, related to genetic factors, neurobiological factors, physiological and psychological factors, as well as abnormalities in the structure and function of the brain, and the typical symptoms are obsessive-compulsive concepts, obsessive-compulsive behaviors, avoidance behaviors, and so on.
Children love to bite fingernails, 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.