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.
Warning signs of DVT include:
Sudden swelling in one leg
Redness or discoloration
Warmth to the touch
Pain or tenderness, especially in the calf
2. Cellulitis: A Fast-Spreading Infection
Another possible cause is cellulitis, a bacterial skin infection that can spread rapidly if not treated with antibiotics.
Common symptoms include:
Red, swollen skin that feels hot and tender
Fever or chills
Rapid spreading of redness
Cellulitis often affects the lower legs and needs prompt medical treatment to prevent complications.
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