Frequent mouth ulcers, also known as recurrent mouth ulcers. The disease is self-limiting, will recur and accompanied by strong pain, resulting in many reasons for the disease, such as injury, lowered body immunity, nutritional deficiency, psychological stress, gastrointestinal disorders, endocrine disorders, genetic factors, etc. Targeted measures can be taken to deal with the cause: 1. injury: may be due to the patient’s teeth constantly rubbing the oral mucosa, or the patient wears orthodontic braces, the ectopic part of the braces Constantly rubbing the oral mucosa when patients chew, or due to bite wounds, are prone to recurrent mouth ulcers; 2, lower body immunity: recurrent mouth ulcer patients often have low body immunity, their own tissue antigen immune reaction, it will induce the appearance of mouth ulcers; 3, nutritional deficiency: research shows that when the intake of vitamin B, vitamin D, as well as zinc, iron, selenium 4, psychological stress: when encountering some events or life changes, learning work life pressure increases, mental tension, too fatigue, poor sleep quality is also easy to frequent mouth ulcers; 5, gastrointestinal dysfunction: when patients suffer from gastritis, colitis, duodenal ulcer, gastric ulcer and other diseases, but also easy to accompany recurrent mouth ulcers appear 6, endocrine disorders: a history of diabetes, endocrine dysfunction in menopause and menstruating women, also prone to frequent mouth ulcers; 7, genetic factors: research shows that when both parents have a history of mouth ulcers, the probability of children with this mouth ulcer is about 80%; when the parents have a history of mouth ulcers alone, the probability of children with mouth ulcers is about 50%. Therefore, treatment is based on symptomatic treatment, and medication can be applied, usually choosing topical drugs with anti-inflammatory, pain-relieving and healing properties, such as chlorhexidine rinse and ulcer patches. Recurrent ulcers caused by psychological stress factors need to pay attention to adjust their bad mood, if necessary, psychotherapy. At the same time, pay attention to keep your mouth clean, develop good oral care habits, eat a light diet, and exercise appropriately.