A blood clot behind your knee can cause swelling and pain. It can become serious if not treated. The popliteal vein runs up the back of the knee and carries blood from the lower leg to the heart.
Popliteal artery entrapment syndrome (PAES) is a rare condition affecting the artery in the back of the knee. It causes pain in the lower legs during exercise. The popliteal artery runs behind the ...
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