Philadelphia Eagles quarterback Jalen Hurts is expected to miss the remainder of the 2026 NFL season after being diagnosed with deep vein thrombosis (DVT) and blood clots in both lungs.In a statement on October 19, the team said the 28-year-old was clinically stable with no significant functional limitations. However, he needs blood thinners and cannot participate in contact sports while taking them.His diagnosis raises questions about how blood clots travel from the legs to the lungs, why they are dangerous and how to reduce the risk.What Happened To Jalen Hurts?Hurts was initially diagnosed with a superficial blood clot in his left calf after reporting discomfort following a cleat injury during the October 4 game against the Los Angeles Rams.Although doctors initially cleared him to play, a follow-up ultrasound in Philadelphia and further testing identified DVT and blood clots in both lungs, known as bilateral pulmonary emboli.The team said his treatment would involve anticoagulants, or blood thinners. He can resume football activities once he stops taking the medication.Also read: Hours Of Sitting, Gaming And Binge-Watching OTT? Doctors Warn Of Blood Clot Risk In Young PeopleWhat Is Deep Vein Thrombosis?Deep vein thrombosis occurs when a blood clot forms in a deep vein, usually in the leg. If part of the clot breaks away and travels to the lungs, it can cause a pulmonary embolism (PE), a potentially life-threatening condition.Prolonged sitting, hospitalization, bed rest, injuries and certain genetic factors can increase the risk of developing blood clots.How Can A Leg Clot Travel To The Lungs?A clot can break away from a deep vein in the leg, travel to the right side of the heart and then enter the arteries supplying the lungs. There, it can block blood flow and strain the heart.“You have a clot in your leg. The problem is it can travel up the veins and go to your heart, and from there, go to your lungs, and block the blood vessels in your lungs,” CBS News chief medical correspondent Dr. Jon LaPook, who is not treating Hurts, told CBS Mornings.“That's very serious,” he added.Why Are Athletes At Risk Of Blood Clots?Read More: World Thrombosis Day: Can An Unexplained Blood Clot Be The First Sign Of Cancer? Experts ExplainHurts is not the first high-profile athlete to experience blood clots. Tennis star Serena Williams has a history of clots, while NBA Hall of Famer Chris Bosh retired early following blood-clot-related complications.Fitness does not eliminate the risk. Injuries and prolonged immobility, including during long-haul flights, can slow blood flow and contribute to clot formation.DJ Corey, director of Northeastern University’s EMT program, said extended periods of sitting during air or road travel can increase the risk because leg muscles help maintain blood circulation.The US Centers for Disease Control and Prevention (CDC) also warns that limited mobility during long-distance travel can increase the risk of venous thromboembolism (VTE), which includes DVT and pulmonary embolism.How Can Travellers Reduce Their Risk? To improve circulation during long journeys, the CDC recommends:Moving the legs frequently while seated.Walking periodically when it is safe to do so.Avoiding prolonged immobility.Consulting a doctor about preventive measures if you have additional risk factors.Compression stockings may help some travellers at increased risk, depending on their medical needs.What Are The Warning Signs Of Blood Clots?DVT symptoms can include leg swelling, pain, tenderness, warmth and skin discoloration. Some people may have no obvious symptoms.Pulmonary embolism warning signs include sudden breathlessness, chest pain, a rapid heartbeat, lightheadedness and coughing up blood.Sudden breathing difficulties, chest pain or fainting require immediate medical attention, as a pulmonary embolism can be life-threatening.