I was diagnosed with a blood clot - the technical term is deep vein thrombosis, or DVT - back in 1999, after a run-of-the-mill road trip and plane flight.In Britain, it’s known as Long Haul syndrome, and is a much-publicized side effect of travel. I’m not sure why American doctors don’t warn about the possibilities of clots when traveling, but it seems to be less known on this side of the Atlantic.I didn’t know I had a clot; it felt more like a muscle cramp. But it put me in the hospital for more than 10 days, where I had a painful heparin drip and a six-month regimen of blood thinners. Here’s what you can do so a clot doesn’t happen to you:1. Stop the car and walk often. There’s no substitute to moving around so blood doesn’t pool in your legs. 3. If you can, get up and stretch your legs when flying. Failing that, try to get an exit row so you have room to move your legs around. That’s what keeps the blood from pooling.blood clots DVTs Long Haul syndrome blood clots when traveling travel tips airplanes roadtrips flights car trips travel