The main reasons why the mouth always suffers from mouth ulcers are the following: 1, improper dietary habits caused by many paranoid, picky eaters will exist in the body vitamin and trace element deficiency, the body lack of vitamin C, vitamin B and trace elements in iron and zinc, the mucosa is easy to ulcers, and many people like to eat spicy, irritating food for a long time, such as love to eat hot pot or spicy hot, long-term consumption 4, people with low immune function, the mouth is prone to the occurrence of mouth ulcers, ulcers will not heal for a long time, and repeated attacks, causing great pain.