As a recurrent ulcerative disease of the oral mucosa, it mainly has the following symptoms: 1. pain: when the ulcer attacks, the patient has severe pain, and the local burning pain is very obvious, which may affect the patient’s eating, pronunciation, and bring great inconvenience to daily life; 2. complications: when the oral ulcer attacks, systemic complications may occur, such as bad breath, chronic pharyngitis, constipation, headache, dizziness, swollen lymph nodes, etc.; 3. Headache, dizziness, swollen lymph nodes, etc.; 3. Cancer: If the mouth ulcer does not heal continuously and for a long time, and the corresponding lymph nodes are swollen, patients should be alert to whether cancer has occurred and go to the hospital in time.