A deep vein thrombosis (DVT) is a blood clot in a vein deep in your body. Usually it's in a lower leg, thigh, pelvis, or arm.
There aren't always symptoms. If there are, they usually include swelling and sometimes pain and tenderness.
“Typically, a person calls saying, ‘I’ve had three or four days of swelling in one of my legs and it won’t go down,’” says Terri Remy, MD, of Virginia Hospital Center.
You’re more likely to have a DVT if you:
Have a blood clotting disorder