Mouth ulcers can be caused by mental reasons, external injuries, and digestive system dysfunction. If recurrent attacks, medication and daily maintenance can be used for treatment. 1. Mental reasons: if the patient’s life and work pressure is large, it is easy to cause mental tension and emotional fluctuations, which will induce mouth ulcers, and the patient needs to relieve the mental pressure in time. For the wound, patients can take antibiotic drugs such as amoxicillin, supplemental vitamin B2 to relieve. 2. External damage: due to bite wounds, food stimulation, etc., resulting in recurrent mouth ulcers, patients should pay attention to oral hygiene, avoid eating too hard, spicy and stimulating food, while taking vitamin B2 under the guidance of the doctor for relief. 3. Digestive system dysfunction: digestive system dysfunction can lead to recurring mouth ulcers, patients can take drugs to promote digestion, such as domperidone and other treatments, and at the same time pay attention to daily diet. When the patient recurrent mouth ulcers phenomenon, it is recommended to consult a professional doctor for diagnosis and treatment in a timely manner.