Identify a red flag for abdominal pain that requires urgent assessment.

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The key idea here is that sudden, severe abdominal pain with signs of peritoneal irritation signals an acute abdomen that needs urgent assessment. When the peritoneum is irritated—often from a perforated hollow organ, a severe infection, or a vascular problem—the condition can deteriorate quickly, so it demands rapid medical evaluation and often immediate imaging or surgical intervention. Look for features such as abrupt onset, intense localized pain, guarding or a rigid abdomen, and possibly fever or a fast heart rate. Because these signs indicate a potentially life-threatening situation, urgent care or emergency services are required rather than waiting at home. In contrast, mild intermittent pain, pain that worsens after meals, or a chronic dull ache typically point to non-acute or less urgent GI issues and do not imply an immediate surgical crisis.