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Peritoneal signs signal acute irritation of the lining of the abdomen and point to a potential surgical emergency. Rigidity, rebound tenderness, and guarding mean the peritoneum is inflamed or irrited, often from hollow-viscus perforation, severe infection, ischemia, or a strangulated obstruction. That level of irritation can deteriorate quickly, so urgent imaging to identify the underlying cause and a surgical consult to plan management are typically required.

By contrast, mild diffuse tenderness that improves with NSAIDs suggests a nonemergent, likely benign cause; normal vital signs can be reassuring but don't completely rule out serious pathology; and non-specific abdominal pain lacks red flags that would mandate urgent imaging or surgery.