Experts call it "economy class syndrome" — but it can happen to anyone in any class of an airplane. Deep vein thrombosis, or DVT as it's known, occurs when blood clots in one or more veins. A 52-year-old former businessman in the banking industry said he developed deep vein thrombosis as a result of a four-hour flight from Singapore to Hong Kong. Urbazon | E+ | Getty ImagesThose who fly long-haul flights are at greater risk, but deep vein thrombosis can develop on shorter flights, he said. Alok Tapadia, a 52-year-old former businessman in the banking industry, said he developed deep vein thrombosis as a result of four-hour flight from Singapore to Hong Kong.

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Persons: Pinakin, Parekh, I've, Tapadia, Doctors Organizations: Heart, Vascular, CNBC Travel, Mayo Clinic, Getty, Clinic Locations: Singapore, Hong Kong