How do you know if you have a blood clot in your leg?

Swelling: Typically you will have pain associated with swelling. If you are concerned the ask for an ultrasound of your leg.

Ultrasound: Best way is to get an ultrasound- a painless test.

Need testing: The only way to know if you have a blood clot is to get testing by a doctor. The two most common test is a venous ultrasound of the legs or a blood test called a D-dimer test. You would need one of these to assess. Although some patients with blood clots have leg symptosm of pain & swelling, many have no immediate symptoms at all & so can be dangerous (can embolize to lungs or delayed symptoms).