ACUTE GASTRITIS. Alcohol abuse or ingestion of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs) are the most common causes. Other causes are steroid or digitalis medications; ingestion of corrosive agents such as lye or drain cleaners; ingestion of excessive amounts of tea, coffee, mustard, cloves, paprika, or pepper; chemotherapy or radiation to the upper abdomen; severe stress that is related to critical illness; staphylococcus food poisoning; infections (candida, cytomegalovirus, herpesvirus) in immunosuppressed patients; and Helicobacter(H) pylori in chronic gastritis.

CHRONIC GASTRITIS. Type A gastritis is considered primarily an autoimmune disorder. The primary cause of type B gastritis is H. pylori, which is found in nearly 100% of the cases of type B gastritis. In both acute and chronic type B gastritis, the normal gastric mucosal barrier is disrupted, which leads to mucosal injury.

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