On this page
Causes of leg swelling
- Venous insufficiency and varicose veins: poor return of blood to the heart.
- Deep vein thrombosis: sudden swelling of one leg.
- Fluid retention: from heart or kidney causes.
- Prolonged standing: mild swelling that settles with rest.
Signs that need a doctor
Sudden swelling of one leg with pain and redness may mean a DVT that needs urgent treatment. Swelling with shortness of breath or chest pain, or persistent swelling that does not improve, also needs medical assessment.
How is it diagnosed?
Diagnosis is based on clinical examination and duplex ultrasound of the veins, and sometimes heart and kidney tests to exclude other causes. Identifying the cause precisely is the basis of the right treatment.
Tips for relief
- Raise your legs when resting.
- Avoid long periods of standing or sitting.
- Use compression stockings when advised.
- Keep a healthy weight and walk regularly.
Frequently asked questions
When is swelling dangerous?
When it is sudden in one leg with pain, or comes with shortness of breath.
Do varicose veins cause swelling?
Yes, venous insufficiency is a common cause.
Do compression stockings help?
Yes, in many cases of venous swelling.
Does swelling always mean a vascular problem?
No, it has other causes that your doctor will identify.
Sudden swelling of one leg is different from long-standing swelling of both — each tells a different story.
Prof. Ahmed Samir Hosny
Professor of Vascular & Endovascular Surgery — Kasr Al Ainy, Cairo University
Professor of Vascular & Endovascular Surgery at Kasr Al Ainy, Cairo University. Fellowship in peripheral endovascular interventions (Kiel, Germany) and aortic surgery fellowship (Cologne, Germany); Member of the Royal College of Surgeons of Edinburgh.
Meet the doctor
