how did you know you had no blood running through your left leg? I mean, did you have symptoms? I guess, what I'm asking is how did you find out you had to have bypass surgery - what were your symptoms? I'm just curious about your condition. Only because I wonder about my left leg as well. It's always got a dull ache to it, not sciatica or anything and my left knee is achey all the time, but it's probably arthritis, but i wondered about blood clot because it's always behind and on the sides of the knee.