Sudden leg swelling can be alarming, and in some cases, it signals a serious medical issue. One of the most dangerous causes is deep vein thrombosis (DVT), which occurs when a blood clot forms in a deep vein—often in the calf or thigh. This can lead to swelling, redness, warmth, and pain. The greatest risk is that the clot can travel to the lungs and cause a life-threatening pulmonary embolism. People who are immobile for long periods, recently had surgery, are pregnant, smoke, or take certain medications face higher risk.9 Another major cause is cellulitis, a fast-spreading bacterial skin infection....
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