Deep Vein Thrombosis (DVT) is a medical condition that occurs when a blood clot forms in a deep vein, usually in the legs. These clots can be serious because they can block blood flow and cause swelling and pain. If a clot breaks free and travels to the lungs, it can cause a potentially life-threatening complication called a pulmonary embolism.

Risk factors for DVT include prolonged immobility (like long flights or bed rest), certain medical conditions, smoking, obesity, pregnancy, and the use of birth control pills or hormone therapy. Symptoms may include swelling, pain, redness, and warmth in the affected leg. However, DVT can also occur without any noticeable symptoms.

Prevention strategies include regular exercise, staying hydrated, and, if necessary, using blood thinners or compression stockings. For those at high risk, such as during long-haul flights, getting up and moving around periodically can be helpful.

Diagnosis typically involves a physical examination, ultrasound, and blood tests. Treatment usually involves anticoagulant medications, which are drugs that help prevent the blood from clotting easily. In severe cases, other medical interventions might be necessary.

It's important for individuals who suspect they might have DVT or are at high risk for it to seek medical advice for proper diagnosis and treatment.