Frequent mouth ulcers are considered to be caused by the recurrence of mouth ulcers, mouth ulcers are recurrent and the etiology is not clear, generally due to genetic, immune, mental, dietary, trauma and other factors. 1. Heredity: oral ulcers have a close connection with heredity, and most patients have a family history of heredity. If the patient’s family has a history of mouth ulcers, most of them will have genetic phenomenon. 2. Immunity: when patients with mouth ulcers are attacked by pathogens such as bacteria or viruses, if the patient’s immunity decreases, it will also lead to the emergence of mouth ulcers. 3. Mental: If the patient has a high level of mental stress in daily life, negative emotions or poor quality of sleep, it may also lead to the development of mouth ulcers. 4. Diet: If the patient has the phenomenon of partiality, the body’s nutritional intake is not sufficient, it may also lead to mouth ulcers. 5. Trauma: If the patient eats sharp food, such as fish bones, shelled food, and toothbrush brushing scratches the oral cavity, can also lead to mouth ulcers. Frequent mouth ulcers may also be caused by other reasons, patients should consult a doctor in time and follow the doctor’s instructions for treatment. In daily life, you should develop healthy habits and ensure adequate nutritional intake.