The causes of mouth sores include teeth accidentally biting, improper diet, mental stress, etc. Symptoms can be improved by general treatment and medication. 1. General treatment: patients are advised to gargle with salt water, eat more fruits and vegetables, eat a light diet, avoid spicy and stimulating foods, get enough rest, stop drinking and smoking, and avoid stress and anxiety. 2. Drug therapy: patients can apply local lidocaine gel to relieve pain; you can also take levamisole, vitamin C and other drugs to improve symptoms. Drugs need to follow the doctor’s instructions for standardized use, not unauthorized use of drugs, the emergence of adverse reactions to timely medical care, drug allergy is prohibited. Therefore, patients with mouth sores need to promptly consult a doctor to receive standardized treatment.