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What are the symptoms of a blood clot in one's leg?

What are the symptoms of a blood clot in the leg? I was in a bike accident a few days ago and banged up my calf pretty badly. Then yesterday I had some swelling and bruising that just seemed way more severe than I'd expect. I know a blood clot is really serious, so how would I know if I had one?
The serious blood clot that you are referring to is called a deep venous thrombosis (or DVT for short), these clots are dangerous because of their potential to travel to the lung and cause severe respiratory and cardiac compromise (this is known as a pulmonary embolus, or PE). most DVTs are caused by a combination of three things: -immobility (allows blood to pool in the venous system, which is a risk for clotting) -hypercoaguability (inflammation or genetic predisposition to clotting) -vessel damage (trauma, either direct or indirect (ie via inflammatory mediators or cancer) The main clinical features of a DVT are unilateral leg swelling, pain, discoloration, and warmth. sometimes a physician will be able to feel the clot in the leg when pressing on the deep leg veins. In order to diagnose a DVT, a simple and painless ultrasound test is performed and the clot can be visualized. Treatment involves prevented the spread of the clot or the formation of new clot with anti-clotting drugs ('blood thinners') like coumadin and heparin. It is difficult to tell if the swelling and pain in your leg is due to the accident itself or due to a clot that may have developed as a result of the accident. If the symptoms persist and the leg remains tender and swollen, I would recommend you see a doctor as soon as possible to have an evaluation in order to prevent the complications (ie PE as above).
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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