Economy class syndrome is a popular term used to describe deep vein thrombosis when it occurs in air travellers on long haul flights. In deep vein thrombosis, a large cylindrical blood clot forms in a vein of the leg.
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If it's still very high, seek medical care. Call 911 or emergency medical services if your blood pressure is 180/120 mm Hg or greater and you have chest pain, shortness of breath, or symptoms of stroke. Stroke symptoms include numbness or tingling, trouble speaking, or changes in vision.