Noticing sudden redness, warmth, or swelling in one leg should never be ignored. These signs often point to a potentially serious health problem that requires prompt attention.

One major concern is deep vein thrombosis (DVT). This condition occurs when a blood clot forms in a deep vein, usually in the leg, blocking circulation. If the clot breaks loose, it can travel to the lungs and cause a life-threatening pulmonary embolism.

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