Ulcers inside the mouth stitches may be due to improper diet, postoperative infection, or may be caused by low immunity, the patient can alleviate the symptoms through diet, medication or the use of immunomodulators. 1. Improper diet: If the mouth ulcers are caused by improper diet, patients should pay attention to diet, avoid spicy and stimulating food, so as not to aggravate the pain, and gargle with light salt water after meals, paying attention to oral hygiene. 2. Post-operative infection: If the ulcers are caused by improper postoperative care and infection, patients with ulcers can follow the doctor’s instructions to apply drugs to promote healing, such as lidocaine gel, cotrimoxazole, recombinant human epidermal growth factor gel, and so on. 3. low immunity: for mouth ulcers caused by low immunity, patients can follow the doctor’s instructions to use immunomodulators, such as levamisole, thalidomide, transfer factor, thymosin, etc., can play a cellular immune regulation function, improve the symptoms. If the patient appears inside the mouth stitches long ulcers and other uncomfortable symptoms, should promptly go to the hospital for consultation, and follow the doctor’s instructions to receive treatment and medication.