Which symptom is a hallmark of compartment syndrome?

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Compartment syndrome develops when pressure within a closed muscle compartment cuts off blood flow, leading to ischemia. The telltale sign is severe, intense pain that is out of proportion to what the exam shows, and this pain often worsens with passive stretching of the affected muscles. This early pain signal reflects nerve and muscle ischemia before other signs become obvious. As pressure rises, numbness or pins-and-needles can occur, and if not relieved, weakness and tissue damage follow. Painless swelling, fever, or slow heart rate are not characteristic features of this condition, so they don’t fit the hallmark pattern. Recognizing the disproportionate pain promptly is crucial because timely relief of pressure—often by decompression—prevents lasting harm.