Deep vein thrombosis (DVT) occurs when blood clots form in the legs during plane flights, chiefly because of prolonged immobility. The longer the flight, the greater the risk. Though most blood clots are reabsorbed uneventfully, some may break off and travel through the blood vessels to the lungs, where they may cause life-threatening complications.
The chief symptom of DVT is swelling or pain of the foot, ankle or calf, usually but not always on just one side. When a blood clot travels to the lungs, it may cause chest pain and difficulty breathing. Travellers with any of these symptoms should seek medical attention immediately.
To prevent the development of DVT on long flights, you should walk around the cabin, contract the leg muscles while sitting, drink plenty of fluids and avoid alcohol and tobacco.
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