Why do people get mouth ulcers?

mouth ulcer Causes: overreaction by the body’s own immune system stress fatigue illness injury from accidental biting hormonal changes menstruation sudden weight loss food allergies deficiencies in B12…iron…folic acid…C…zinc ceased cigarette smoking Some drugs, such as nicorandil Some recreational drugs eating sharp or abrasive food poorly fitting dentures…dental braces trauma from a tooth brush Chemicals such as aspirin or alcohol that are held or that come in contact with the oral mucosa Sodium lauryl sulfate (SLS), one of the main ingredients in most toothpastes viruses such as - Herpes simplex virus…shingles…chicken pox…Coxsackie A virus and its subtype…HIV bacteria such as - tuberculosis…syphilis…aerobic streptococci…Neisseria…Actinomyces…spirochetes…Bacteroides fungal such as - valley fever…cryptococcosis…North American Blastomycosis Protozoans such as - Entamoeba histolytica when the body becomes aware of and attacks chemicals which it does not recognize low levels of immunoglobulin caused by such things as - Chemotherapy…HIV…mononucleosis Autoimmunity allergies Oral cancers Behçet’s disease Bullous pemphigoid Coeliac disease (gluten sensitivity) Crohn’s disease Gingivostomatitis Leukoplakia oral lichen planus Lupus erythematosus Neutropenia Oral thrush *Ulcerative colitis