A fat tongue may be caused by physiological hypertrophy, deformity, tongue tumor, etc. It can be made smaller by full denture restoration, injection of sclerosing agent, excision surgery, etc. under the guidance of a doctor. 1. Physiological hypertrophy: If the upper and lower teeth are missing, that is to say, when the whole mouth is toothless, the tongue will become bigger, and the tongue can usually be restored to normal size after completing the denture restoration. 2. Malformation: If the tongue has venous malformation, lymphatic malformation or mixed malformation, etc., the tongue cannot return to normal size by itself. Sclerosing agents can be injected into the tongue to make it shrink and become smaller. 3. Tongue tumor: If the tongue is enlarged due to tongue tumor, you need to go to hospital stomatology department for inpatient surgery to remove the enlarged tongue and make it smaller. There are many factors that cause the tongue to become fat and large, so we suggest that patients should go to the hospital in time to consult the doctor, clarify the cause of the disease and take effective measures under the guidance of the doctor.