Frequent tongue biting may be caused by tongue hypertrophy, local oral irritants, cerebrovascular lesions and so on. 1. Hypertrophy of the tongue: some causes of tongue hypertrophy, inadvertently bite the tongue will be bitten. 2. Oral local stimulation factors: for example, irregular teeth, there will be occlusal disorders, in the bite will be buccal, tongue mucosa damage. The sharp tips of teeth formed by long-term wear and tear will produce certain stimulation to the buccal and lingual mucosa, which may bite the tongue. 3. Cerebrovascular lesions: some cerebrovascular lesions may have abnormal oral and jaw function in the early stage, which may lead to tongue biting and so on. Frequent biting of the tongue should attract enough attention, timely to the hospital, clear cause for active treatment, so as not to delay the condition.