Answer:
As the peritoneum adjacent to a diseased organ becomes inflamed, palpation or any abdominal movement causes stretching of the sensitized peritoneum and, consequently, pain localized at that site (localized peritonitis). If irritating material (pus, blood, gastric contents) spills into the peritoneal cavity, the entire peritoneal surface may become sensitive to stretch or motion, and any movement or palpation may provoke pain at any or all points within the abdominal cavity (generalized peritonitis).

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