I believe that all of us have experienced mouth ulcers and should not be unfamiliar with them. Mouth ulcers attack the ulcer local burning pain, oral blood blisters, bad breath, swollen lymph nodes and other symptoms, so that we suffer a lot, but there is nothing we can do about it. The incidence of mouth ulcers is more than 10%, and can occur throughout the year. It is not too much to say that mouth ulcers are a worldwide difficult problem. Causes are as follows: 1, more triggers, mouth ulcers are a symptom of its pathogenesis for a variety of reasons, some with immunodeficiency, some with the autoimmune response, and some with genetic factors, digestive disorders, and even diabetes can cause mouth ulcers, such as cancerous mouth ulcers, oral ulcers caused by traumatic injury, tuberculosis mouth ulcers and systemic immune diseases. All may cause mouth ulcers. 2, easy to recur, mouth ulcers are also called recurrent mouth sores, or recurrent aphthous ulcers. Then recurrence is a very characteristic place, it is in addition to recurrence, there is a very interesting feature, it has a self-limiting, it is generally in seven to ten days or so, can heal themselves. 3, the symptoms are more obvious, oral ulcers is the destruction of the whole layer of oral mucosal epithelium, is a common occurrence in the oral mucosa of ulcerative injury disease, the most common symptom is pain, most commonly found in the inner lip, tongue, tongue belly, buccal mucosa, vestibular groove, soft palate and other parts of the mucous membrane in these parts of the mucous membrane lack of keratinization layer or keratinization is poor. 4, more complications, severe oral ulcers will cause other diseases, can be complicated by bad breath, chronic pharyngitis, constipation, headache, dizziness, nausea, fatigue, irritability, fever, lymph node swelling and other systemic symptoms. 5, more types, oral ulcers is the destruction of the whole layer of oral mucosal epithelium, the most common symptom is pain, the most common ulcers are recurrent oral ulcers (recurrent aphthous ulcers), stomatitis-type aphthous ulcers, periglottic aphthous ulcers, the latter two types of ulcers will seriously affect the patient’s life. Together, these several factors of oral ulcers constitute a worldwide problem that is self-healing but more recurrent.