Noticing that one of your legs has suddenly become red, warm, and swollen can be alarming. While some people might think it is just from standing too long or a minor injury, the truth is that this symptom often points to an underlying health issue. In many cases, it requires prompt medical attention. Understanding the possible causes can help you recognize when to seek help and avoid dangerous complications.

1. Deep Vein Thrombosis (DVT)

One of the most serious causes of sudden redness and swelling in one leg is deep vein thrombosis (DVT). This condition occurs when a blood clot forms in a deep vein, usually in the calf or thigh. The blockage prevents blood from flowing properly, leading to pain, swelling, redness, and warmth in the affected leg.

DVT is particularly dangerous because the clot can travel through the bloodstream to the lungs, causing a pulmonary embolism—a potentially life-threatening emergency. Risk factors include sitting for long periods (such as during long flights), recent surgery, pregnancy, smoking, obesity, and certain medications like birth control pills. If you notice sudden swelling in one leg along with pain or shortness of breath, you should seek medical help immediately.

2. Cellulitis (Skin Infection)

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