In medical terms, mouth ulcers, also known as canker sores, are superficial ulcers that occur on the oral mucosa and can range in size from rice to soybean, round or ovoid, with a concave, congested surface that can be painful due to irritating foods and generally heal on their own in one to two weeks. Because mouth ulcers are a common immune disease, it is inevitable that people will be plagued by mouth sores throughout their lives. Therefore, in the common people’s perception, mouth ulcers do not seem to be a big problem, just a “fire” or a “vitamin deficiency due to a lack of vegetables”, but is it really so? What kind of disease is a mouth ulcer? The doctor said that if it is an occasional mouth ulcer, it does not seem to be a big problem; if the mouth ulcer is recurrent, or accompanied by other symptoms, then it should cause us enough alarm. Because many systemic diseases can be manifested as local oral mucosal ulcers, such as systemic lupus erythematosus, leukodystrophy and other rheumatic diseases often appear repeated oral ulcers, then the oral ulcers at this time is not a minor problem. Even if it is simply “recurrent oral ulcers”, ulcers repeatedly do not heal, pain, bring eating and drinking, open mouth to speak difficulties, but also seriously interfere with our quality of life, at the same time there are some oral ulcers deep large not healed can gradually develop into malignant. ”Small problems” trigger big danger 1, the body immune oral ulcer to the patient’s life and work brings a lot of pain and inconvenience, more serious is the long-term recurrent attacks will directly affect the immune function of the patient’s entire body. 2, endocrine disorders Oral ulcer caused by metabolic disorders endocrine disorders, fever, headache, dizziness, nausea, weakness, vision loss, eye pain, mosquitoes, lymph node enlargement and other systemic symptoms, serious cases can lead to blindness. 3.Organ malignancy Oral ulcers can also cause systemic symptoms such as multiple ulcers of skin, joints and internal organs and perineum, recurrent uveitis, and even cause malignant changes. 4, the risk of cancer Oral ulcers that remain untreated for a long time will most likely lead to malignant changes, causing great harm to the health of patients. 5, induce leukoaraiosis, oral leukoplakia and systemic lupus erythematosus, and induce a variety of complications, aggravate the condition, and in serious cases, can be life-threatening. Many patients think that long-term mouth ulcers are an inflammatory lesion and do not need treatment. However, among the many mouth ulcers, there are a few that are not inferior to oral ulcers, including tuberculous ulcers and syphilitic ulcers, and they do not heal on their own. Even some oral ulcers are early manifestations of some kind of malignant tumors at the beginning, such as tongue cancer, gum cancer, and buccal mucosa cancer. If these ulcers are neglected or treated as inflammation with their own “small prescriptions”, they will definitely delay the disease and accelerate the spread of radiation area, with unimaginable consequences.