Redness Swelling and Warmth in One Leg

If you’ve noticed sudden redness, swelling, or warmth in one leg, it’s important not to brush it off. While it might seem minor at first, these symptoms can signal serious underlying health conditions—some of which require immediate medical attention.

Here’s what you need to know.

1. Deep Vein Thrombosis (DVT): A Silent Threat

One of the most serious possibilities is deep vein thrombosis (DVT). This condition occurs when a blood clot forms in a deep vein, usually in the leg.

If left untreated, DVT can lead to a pulmonary embolism—a potentially life-threatening situation where the clot travels to the lungs and blocks blood flow.