The causes of recurrent mouth ulcers are very complex and not yet clinically defined, and can be triggered by a variety of causes. Some immune, genetic, disease and trauma factors are possible triggers for recurrent mouth ulcers. The clinical treatment of recurrent mouth ulcers is based on relieving symptoms and adjusting living habits, while a balanced diet, supplementing nutrition, avoiding late nights and relaxing in daily life should be used to reduce mouth ulcer attacks from the source. A, the reason: 1, immune factors: the human body is prone to induce mouth ulcers when immunity is low, immunity is low will also break the immune balance in the mouth, resulting in recurring mouth ulcers; 2, genetic factors: some patients with recurrent mouth ulcers, may have a family history of mouth ulcers; 3, dietary factors: picky eating, anorexia, and a lot of eating high sugar, high fat, high calorie, greasy, spicy food, etc. It is easy to cause the body to lack iron, calcium, zinc, vitamins and other essential nutrients, and at the same time may cause fire, which may induce recurrent mouth ulcers; 4, psychological factors: when the human body is under mental stress, it is easy to produce irritability, anxiety and other bad emotions, reducing the immune system activity, which can easily cause recurrent mouth ulcers; 5, disease factors: patients suffering from digestive tract diseases, easily due to stomach , abdominal discomfort, resulting in loss of appetite, thus causing a lack of nutrients in the body, which can easily induce recurrent mouth ulcers. Herpes virus and other viral infections of the mouth, can induce the occurrence of oral ulcers, if the primary disease is not cured, can cause recurrent oral ulcers. Second, treatment: 1, local treatment: mouth ulcers causing pain, you can use lidocaine gel, compound benzocaine gel and other drugs to apply, can help to relieve the burning, pain caused by mouth ulcers. You can also use mouthwash, cetiolide tablets, etc., which can have an inhibitory effect on the bacteria in the mouth and can relieve the inflammatory symptoms caused by mouth ulcers to some extent. In addition, you can also use watermelon cream, growth factor gel, etc., which can be applied to the surface of the mouth ulcer to promote the healing of the ulcer surface; 2. Systemic treatment: for those who have a high frequency of recurrent attacks, causing dietary and speech disorders, immune preparations such as levamisole and transfer factor can be used for treatment; or oral vitamin C, vitamin B and other supplements for systemic combined medication; 3. Daily life conditioning: daily life should Pay attention to the appropriate amount of vegetables, fruits and high-quality meat to supplement protein, vitamins, iron, calcium, zinc and other nutrients to avoid the recurrence of mouth ulcers. At the same time, moderate exercise should be allowed under physical conditions, which is conducive to improving the body resistance to prevent recurrent mouth ulcers.