Common clinical causes of tongue biting include abnormal tooth alignment, tongue hypertrophy, and central nervous system disorders. 1. Abnormal alignment of teeth: Abnormal alignment of teeth may lead to biting dysfunction. This may lead to biting the tongue, oral mucosa and other parts of the mouth when eating. 2. Hypertrophy of the tongue: If the patient’s tongue is hypertrophied, the mucous membrane of the tongue is also easily bitten by the teeth when eating. 3. Central nervous system diseases: Suffering from central nervous system diseases such as cerebral hemorrhage, cerebral infarction, etc., the ability to control the movement of the tongue is abnormal, which may also lead to always biting the tongue. There may be other clinical reasons for tongue biting. It is recommended to go to the stomatology department of the hospital as soon as possible, and complete the relevant examinations to clarify the cause.