An<unk>  (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<unk> s 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<unk>  may be maintained by inflammation and/or secondary infection. Two common<unk>  types are aphthous<unk> s (canker sores) and cold sores, which are caused by the herpes simplex virus.
Oral ulcer
Oral cancer
Nosebleed
Deep neck infection
Genital ulcer
Stomach rumble
Oral complications of cancer treatment
Sore mouth infection