This is the one item you should always pack on a long-haul flight
Briefly

Deep vein thrombosis (DVT) is a serious health concern that can arise from prolonged immobility during air travel. When blood flow slows in deep veins, particularly in the legs, blood clots can form, potentially leading to conditions like pulmonary embolism. Several factors, including age, pregnancy, certain medications, and pre-existing medical conditions can elevate the risk of DVT in travelers, particularly on flights longer than four hours. Compression socks may provide benefits by promoting better blood circulation during flights.
DVT occurs when a blood clot forms in a deep vein, and can become life-threatening during long flights due to inactivity.
Those over 60, pregnant women, and those on certain medications are at higher risk for developing DVT during air travel.
Read at CN Traveller
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