What are the symptoms of a blood clot after surgery?

The main symptoms are: calf pain or tenderness, swelling in one leg, redness or warmth over the calf. If a clot travels to the lungs (pulmonary embolism), symptoms include sudden shortness of breath, chest pain, or coughing blood — this is a medical emergency requiring immediate 000/999/911.

When is DVT risk highest after surgery?

Risk is highest in the first 2–4 weeks after surgery, particularly for orthopaedic procedures like knee and hip replacement. However, risk remains elevated for up to 3 months after major surgery.

How long should I take blood thinners after surgery?

Duration varies by surgery: typically 10–14 days for abdominal surgery, 28–35 days for hip and knee replacement, and longer for higher-risk patients. Follow your surgeon's specific prescription.

Can I fly after surgery?

Flying significantly increases DVT risk due to prolonged immobility and cabin dehydration. Most surgeons recommend waiting at least 2–6 weeks depending on the surgery. Compression stockings, regular movement, and hydration are essential if flying is necessary.

Are compression stockings necessary after surgery?

Yes — for most major surgeries, compression stockings are prescribed as standard DVT prevention. Wear them as instructed, typically from the day of surgery until fully mobile.

⚕️ General information only. Always follow your medical team's specific instructions.

Blood Clot (DVT) After Surgery: Symptoms, Risk, and Prevention

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Based on guidance from NHS, NICE, AAOS & healthdirect

Last reviewed: July 2026 · Free to use · No data collected

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Deep vein thrombosis (DVT) (a blood clot forming in a deep vein, usually in the leg) is one of the most serious postoperative complications. Post-surgery DVT risk is significantly higher than normal because surgery triggers clotting, movement is reduced, and blood flow slows during and after the procedure. Knowing the symptoms of a blood clot after surgery, understanding your specific risk, and following prevention measures can be life-saving.

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Recovery essentials

Little things that make a real difference: the kind of practical help other patients wish someone had mentioned.

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The single most important thing you can buy for DVT prevention after surgery. Compression/TED stockings →

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Blood Clot (DVT) After Surgery: Symptoms, Risk, and Prevention

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