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Thrombosis risk factors include prolonged immobility, obesity, pregnancy, smoking, and a history of blood clots. Additional factors are birth control use and underlying health conditions. Common symptoms include pain, swelling, redness, and warmth in the affected area. Learn more about the risk" target="_blank" rel="noopener noreferrer">https://njvvc.com/travelers-thrombosis-red-blotches-on-ankles-or-calves/">risk factors and symptoms of traveler’s thrombosis.