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A blood clot in the leg can be life-threatening if it travels through the bloodstream to become lodged in the lungs. This extreme complication can cause a pulmonary embolism, but even before a clot reaches this severity, it can cause a range of potentially dangerous symptoms.

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1. Inflammation

Blood clots can cause unexplained swelling. The density of the bone and tissue in this part of the body makes it difficult to breakdown or clear out clots naturally. Inflammation or swelling of the calf, ankle, or upper leg may indicate a blood clot, especially if the usual home treatments for swelling, such as cold and hot compresses, fail to alleviate the symptom.

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