Mouth ulcers clinically known as oral ulcers, recurrent aphthous ulcers have no clear etiology, related to genetics, emotions, micronutrient deficiencies, etc. Traumatic oral ulcers have a clear irritant. 1. recurrent aphthous ulcers: the onset may have the role of immunogenetic factors. The onset of the disease is related to mental stress, overwork, external stimuli, climate maladaptation and so on. Some studies have shown that the lack of zinc, iron and other trace elements, or the lack of B vitamins, and the development of recurrent Aphthous ulcer may be related. 2. Traumatic aphthous ulcers: there are clear physical, chemical and other irritating factors. If aphthous ulcers, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.