Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «U»:
Ulcer: An area of tissue erosion, for example, of the skin or lining of the gastrointestinal (GI) tract. Due to the erosion, an ulcer is concave. It is always depressed below the level of the surrounding tissue.
Ulcers can have diverse causes. Ulcers on the skin are often due to irritation, as with ...
Ulcer, aphthous: A small sensitive painful ulcer crater in the lining of the mouth. Commonly called a canker sore.
Picture of a canker sore
Aphthous ulcers are one of the most common problems that occur in the mouth. About 20% of the population (1 in 5 people) have aphthous ulce...
Ulcer, Buruli: See: Buruli ulcer....
Ulcer, duodenal: See: Duodenal ulcer....
Ulcer, esophageal: A hole in the lining of the
esophagus (tube-like organ leading from the throat to the stomach) corroded by the acidic
digestive juices secreted by the stomach cells. Ulcer formation is related to H. pyloridus
bacteria in the stomach, anti-inflammatory medications, and smoking ciga...
Ulcer, gastric: A hole in the lining of the stomach
corroded by the acidic digestive juices which are secreted by the stomach cells. Ulcer
formation is related to H. pyloridus bacteria in the stomach, anti-inflammatory
medications, and smoking cigarettes. Ulcer pain may not correlate with the presen...
Ulcer, peptic: A peptic ulcer is a hole in the lining
of the stomach, duodenum, or esophagus. A peptic ulcer of the stomach is called a gastric
ulcer, an ulcer of the duodenum is a duodenal ulcer, and a peptic ulcer of the esophagus
is an esophageal ulcer. A peptic ulcer occurs when the lining of th...
Ulcer, stasis: A stasis ulcer is an ulcer (a crater) that develops in an area in which the circulation is sluggish and the venous return (the return of venous blood toward the heart) is poor. A common location for stasis ulcers is on the ankle.
Stasis refers to a stoppage or slowdown in the flow o...
Ulceration: The process or fact of being eroded
away, as by an ulcer....
Ulcerative colitis: A relatively common disease that
causes inflammation of the large intestine (the colon). The cause is
Ulcerative colitis is a form of inflammatory bowel disease. It has
some similarity to a related disorder, Crohn's disease.
The end of the colon (the rectum) is alwa...
Ulcerative gingivitis: This is trench mouth, a
progressive painful infection with ulceration, swelling
and sloughing off of dead tissue from the mouth and throat
due to the spread of infection from the gums.
Certain germs (including fusiform bacteria and spirochetes) have
been thought to be inv...
Ulcerative proctitis:Ulcerative colitis that is limited to the rectum.
Ulcerative colitis itself is a relatively common disease involving inflammation of the large intestine (the colon). The cause is unknown. It is a form of inflammatory bowel disease and has some similarity to a related disorder, ...
Ullrich congenital muscular dystrophy
Ullrich congenital muscular dystrophy: A disorder evident at birth characterized by muscle weakness, contractures of multiple joints, and hyperextensibility (looseness) of joints, particularly distal joints (well away from the trunk). The muscle weakness progresses slowly and ranges from mild to sev...
Ulna: The larger of the two long bones within the forearm. (The smaller one is the radius). The ulna is on the same side of the arm as the little finger....
Ulnar: Referring to the larger of the two long bones in the forearm. (The smaller one is the radius). The ulna is on the same side of the arm as the little finger....