Biting the tongue while eating is usually a sign of stress, oral deformity, localized oral disease, or intracranial disease, and requires prompt medical attention. Occasional tongue biting usually requires no special attention, and is usually the result of stressful thoughts that lead to a lack of concentration while eating, resulting in tongue biting. Oral deformities such as tongue, teeth or denture discomfort may cause frequent biting of tongue while eating; and local oral diseases such as oral cancer and tongue cancer may cause excessive hypertrophy of tongue muscles and poor bite relationship of teeth, resulting in frequent biting of tongue while eating. When patients with cerebral hemorrhage and stroke develop, their tongue and upper and lower jaws usually cannot move normally and flexibly, which may also lead to the symptom of biting the tongue when eating.