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This article helps you tell routine aches from urgent problems by outlining the warning signs of serious leg pain and when to seek care. It highlights red flags—sudden severe pain, one‑leg swelling with warmth/redness, calf pain after travel or surgery, chest pain or shortness of breath, numbness or weakness, a cold or pale foot, fever, open wounds or ulcers that won’t heal, color changes, or inability to bear weight—so you know when to call emergency services or get same‑day evaluation. It explains common causes such as blood clots (DVT), peripheral artery disease, infections, nerve compression/sciatica, and fractures, and offers practical steps for what to do now and how to prepare for a medical visit. Supportive and evidence-based, it empowers patients and caregivers to act promptly, reduce complications, and make informed decisions.