DEAR DOCTOR K: A friend of mine recently developed a blood clot in his leg after a long flight. I travel a lot for work, so this has me worried. Is there any way to prevent this type of thing?
DEAR READER: A blood clot that forms deep inside a leg vein, known as deep-vein thrombosis (DVT), can cause pain, swelling and redness in the affected limb. But the real threat happens if the clot breaks off and travels to the lungs. Known as a pulmonary embolism, this can lead to sudden death. (I've put an illustration of this process on my website, AskDoctorK.com.)