Many patients encounter mouth ulcers, mistaken for “fire”, fierce drink herbal tea. In fact, the cause of mouth ulcers is still unclear, spiritual, psychological and social factors, genetic factors, infectious factors, nutritional deficiencies and other factors can trigger ulcers, these cases drink herbal tea is not the solution. Recurrent mouth ulcers also have a very close relationship with immunity. Some patients show immune deficiency, while others show autoimmune disorder. In addition, anemia, partial diet, indigestion, diarrhea, fever, excessive fatigue, work stress, and changes in the menstrual cycle are also predisposing factors. As one or more factors are active, alternating and overlapping, there is a decrease in muscle immunity and immune dysfunction, which also causes frequent episodes of mouth ulcers. Recurrent mouth ulcers attack when the lesion mucosa necrosis in the mouth, the formation of ulcers, the larger the ulceration point the more painful, but there is self-limiting, generally about 7 ~ 10 days to heal naturally. Oral ulcers usually occur in the buccal mucosa, tongue and mouth and lips where there is often movement, so the pain is very obvious during the attack, plus the constant recurrence, which can have a great impact on the work and life of patients. Doctors remind people to eat more vegetables and fruits, take vitamin B2 and zinc gluconate supplements, pay more attention to rest and combine work and rest. If the mouth ulcer is not healed for a long time, it is easy to become cancerous. If often stimulated by chewing and talking, it may become cancerous over time. That is, those parts in contact with teeth, due to the patient’s reluctance to remove the remaining broken teeth, teeth extraction is not to repair, or denture repair is not appropriate, sharp edges constantly stimulate, scraping the mucosa to produce ulcers. If the stimulus is not removed, the ulcer will not only not heal but will only get worse. This kind of ulcer that does not heal over time is a kind of precancerous lesion, which is very easy to become cancerous. If the disease is delayed and spreads at an accelerated rate, the consequences are unthinkable. Therefore, you should consult your doctor promptly if you have any problems.