Mouth ulcers, called oral ulcers, commonly known as “mouth sores”, are superficial ulcers on the oral mucosa, from the size of rice grains to soy beans, round or oval, concave ulcer surface, surrounding congestion, can cause pain due to irritating food, generally 1-2 weeks can be self-healing. Oral ulcers often occur, often associated with trauma factors, malnutrition, endocrine disorders, mental, genetic and other factors. 1, trauma factors: mainly refers to the local external stimulation of the oral mucosa, such as dental bites, hard food scratches oral mucosa, etc., which in turn causes ulcers to appear in the patient’s mouth. 2, malnutrition: the lack of trace elements and B vitamins in the human body, etc., will increase the probability of oral ulcers; 3. Endocrine disorders: before the onset of menstruation, some women can appear in the mouth often have ulcer symptoms, mainly due to the female pre-menstrual body progesterone level increased, and estrogen levels decreased due to endocrine disorders; 4, mental factors: excessive psychological pressure and irregular rest and rest, etc., can make the body of false fire, resulting in mouth ulcers; 5, genetic factors: mouth ulcers and genetic Certain relationship, if there are members of the family often mouth ulcers, patients are also prone to the symptoms of frequent ulcers in the mouth; 6, radiotherapy and chemotherapy: long-term radiotherapy will cause a significant reduction in the number of human white blood cells, followed by damage to normal oral mucosal cells, causing widespread oral ulcers, and even affect the human swallowing function; 7, other: if the immunity of the patient’s body decreases, or there are stomach ulcers, Duodenal ulcer, ulcerative colitis, etc. are also prone to frequent ulcers in the mouth. In addition, if the patient suffers from leukoplakia, oral tumors and other diseases, it is also easy to accompany the mouth ulcers.