No matter what steps you take to reduce your risk of developing deep vein thrombosis while flying, there’s still a chance a blood clot might form in your legs. Typical symptoms of DVT include pain and swelling in the affected area.
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While a blood clot itself isn’t dangerous, the reason DVT is considered a serious condition is because the blood clot could break loose, travel through the bloodstream and end up lodged in the lungs (a potentially fatal condition called pulmonary embolism). Typical symptoms of pulmonary embolism include a rapid pulse, chest pain, sudden shortness of breath, lightheadedness, coughing up blood and possible fainting. If you experience these symptoms while flying, you should immediately inform a flight attendant.