The reasons why children like to bite things are psychological factors, micturition period, intestinal parasites and so on. 1. Psychological factors: due to nervousness, anxiety, depression and other psychological factors, the child bites things to divert his attention and relieve the child’s nervousness, anxiety, depression and other emotions. 2. Micturition: If the child is in the age of micturition, the child is in a period of curiosity and tends to explore the surrounding environment by biting things. 3. Intestinal parasites: If the child is infected with parasites in the intestines, the parasites may produce some kind of toxin or metabolite in the intestines, which may affect the central nervous system of the brain and cause the child to bite things. If the child likes to bite things, parents are advised to take the child to the hospital in time to improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions to use medication, so as to avoid delaying the condition.