The symptom of biting the tongue after sleeping and waking up in pain may be related to a bad bite of the teeth. Similar symptoms may occur if there is oral gum inflammation, tooth decay, or malocclusion. Biting the tongue may also be related to swelling, inflammation, and hypertrophy of the tongue. If you have poor sleep quality, have long dreams and dream of eating hard things, you may also have symptoms of teeth biting into the tongue. Patients who usually have diseases such as high blood pressure, high blood lipids or diabetes are prone to bite their tongues when they sleep. It may also be related to having cerebrovascular disease. Patients with epilepsy who have seizures while sleeping may also have symptoms such as biting their tongues, foaming at the mouth, and twitching of limbs. If similar symptoms occur frequently, you should go to the hospital and have relevant tests done to determine the cause of the disease before treatment.