DVT — the plain-language one-pager.

What is Deep Vein Thrombosis?Diagnosis

Deep Vein Thrombosis (DVT) is a blood clot that forms in a deep vein — almost always in the leg or pelvis. Two things make DVT dangerous: part of the clot can break off and travel to the lungs, causing a pulmonary embolism (PE) — a life-threatening event; and even when treated, the clot can damage vein valves and cause post-thrombotic syndrome, with chronic leg swelling and pain. Catching DVT early, treating it properly, and preventing the next one are all in your control.

• Classic signs — One-sided leg swelling, pain, tenderness, warmth, redness, often in the calf or thigh. Sometimes there are no symptoms — a sudden PE can be the first sign.
• Top triggers — Recent surgery (especially orthopedic), hospitalization, long immobilization (long flights, bed rest), pregnancy/postpartum, hormonal contraception, cancer, obesity, smoking, prior DVT, inherited clotting disorders (Factor V Leiden, Prothrombin gene), and increasingly recognized: severe COVID-19.
• How it is diagnosed — Clinical Wells score → D-dimer blood test → venous duplex ultrasound (the diagnostic gold standard). Sometimes CT or MR venography for pelvic clots.
• Treatment — An anticoagulant (apixaban or rivaroxaban first-line for most; LMWH or warfarin in some cases). Duration is the key decision: 3 months for provoked DVT, often indefinite for unprovoked or recurrent DVT. Compression stockings reduce post-thrombotic syndrome.

Provoked vs. unprovoked — the duration decisionKnow your plan

Almost every DVT decision after the first month comes down to one question: was the clot provoked by something temporary, or did it come out of nowhere? The answer drives how long you stay on anticoagulation — and that decision changes your bleeding risk and your recurrence risk for years.

• Provoked DVT — clot triggered by surgery, trauma, hospitalization, immobilization, pregnancy, hormonal contraception. Usually treated 3 months, then stop. Recurrence risk after stopping is low.
• Unprovoked DVT — no obvious trigger. Recurrence risk is much higher. Many patients stay on long-term anticoagulation indefinitely.
• Cancer-associated DVT — anticoagulation continues as long as cancer is active.
• Recurrent DVT — almost always indefinite anticoagulation.
• Inherited clotting disorders — Factor V Leiden, prothrombin mutation, antithrombin/protein C/S deficiency, antiphospholipid syndrome — change the calculus.

Your daily Force FieldLive It

• Take your anticoagulant every day, same time — apixaban / rivaroxaban / dabigatran / warfarin all work only when consistent.
• Compression stockings — knee-high, 20-30 mmHg, daytime use, especially after a leg DVT. Cuts post-thrombotic syndrome risk.
• Move — early ambulation after the diagnosis is safe and helpful. Walk daily once cleared.
• Hydrate + avoid prolonged immobility — on long flights/drives: walk every 1-2 hours, ankle pumps, hydrate, avoid alcohol.
• Surgery + travel risk plan — tell every surgeon and dentist you have a clotting history. Consider perioperative bridging plans.
• Bleeding awareness — know what to do if you fall, hit your head, or get a cut that won't stop. Carry a med list. Wear a medical ID.
• Family screening if you have an inherited clotting disorder — first-degree relatives may be screened.
• Vaccines + cancer screening up to date — both are ways to lower DVT recurrence risk indirectly.

Red flags — call nowAction

• Call your clinic the same day for: new chest discomfort with exertion that goes away with rest (stable leg swelling and pain worth evaluating); a missed dose of antiplatelet or anticoagulant; medication side effects (muscle aches, bleeding, GI symptoms).
• Bring up at next visit: any change in exercise tolerance, lipid follow-up timing, BP log review, smoking-cessation support, depression screening, sleep concerns.