A lesion that forms in the wall of the stomach or of the duodenum, & the result of stomach acid eroding the gastric mucosa causing pain & bleeding.

• A. Ulcer
• B. Gastritis
• C. Duodenitis
• D. Gastric carcinoma

Answer: (A)

A lesion formed when stomach acid erodes the mucosa of the stomach or duodenum is an ulcer. An ulcer is a crater-like break in the lining that extends into deeper layers, and it can produce pain and bleeding as the damaged tissue leaks or erodes blood vessels. This is characteristic of peptic ulcer disease, where acid and enzymes injure the mucosa faster than it can heal.

Gastritis is simply inflammation of the stomach lining, which may accompany ulcers but is not defined by an excavation. Duodenitis refers to inflammation of the duodenum, not a crater from erosion. Gastric carcinoma is a malignant tumor, a much different process from erosion-based ulceration.