HealAll.info An oral ulcer (from Latin ulcus) is the name for the appearance of an open sore inside the mouth caused by a break in the mucous membrane or the epithelium on the lips or surrounding the mouth. The types of oral ulcers are diverse, with a multitude of associated causes including: physical or chemical trauma, infection from microorganisms or viruses, medical conditions or medications, cancerous and sometimes nonspecific processes. Once formed, the ulcer may be maintained by inflammation and/or secondary infection. Two common oral ulcer types are aphthous ulcers (canker sores) and cold sores. Cold sores can be caused by the herpes simplex virus. Causes ====== There are many processes which can lead to ulceration of the oral tissues. In some cases they are caused by an overreaction by the body’s own immune system. Factors that appear to provoke them include stress, fatigue, illness, injury from accidental biting, hormonal changes, menstruation, sudden weight loss, food allergies and deficiencies in vitamin B12, iron and folic acid. Oral ulcers are also a common result of ceased cigarette smoking, affecting about two out of five quitters. Some drugs, such as nicorandil, have also been linked with oral ulcers.Some recreational drugs cause mouth ulcers.

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