The tongue pain may be caused by the following reasons: 1, it may be caused by ulcers, if the patient has a lack of vitamins or low body resistance, it is very likely to cause mouth ulcers, ulcers that grow on the tongue will cause tongue pain. 2, the tongue pain may be caused by gastrointestinal disorders, irregular diet and patients who smoke and drink, may have this symptom. 3. It is also possible to have tongue pain, there are many causes of tongue infection, the specific cause needs to go to the hospital for professional examination. 4, if the body on fire may also lead to pain in the tongue, it is recommended to drink more warm water as well as a light diet. 5, if the mental stress may also appear the symptoms of tongue pain. If the tongue pain is not relieved for a long time, it is advisable to go to a hospital stomatology department for a systematic examination.