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8 signs of a dangerous blood clot

Medically reviewed by Alicen Nelson, MD, MPH Key Takeaways Lightheadedness or dizziness can be a sign of a blood clot in the lungs, heart, or brain and may lead to fainting in severe cases.Swelling, ...
A blood clot in a deep leg vein is one of the most common serious cardiovascular events people cannot name. A U.S. Surgeon General's report estimated that at least 350,000 Americans are affected by ...