Leg Swelling
Swelling, or edema, is a buildup of fluid that makes the ankles, feet, or calves look puffy. Occasional mild swelling is common, but swelling that is persistent, painful, or in one leg only can signal a vein, clot, or other medical problem.
What leg swelling tells you
Where the swelling is, and whether it affects one leg or both, is the most important clue.
Swelling in both legs that builds through the day and eases overnight often points to the veins not returning blood efficiently. It can also relate to the heart, kidneys, thyroid, or certain medications. Pressing the swollen area may leave a dimple that slowly fills back in.
Swelling in one leg, especially if it comes on suddenly with pain, warmth, or redness, needs prompt attention because it can be a sign of a blood clot (deep vein thrombosis). Long-standing one-sided swelling can also come from vein disease or lymphedema.
Common causes of leg swelling
Several of these are circulation conditions that a specialist treats. Tap any card to learn more.
Knee Osteoarthritis
Worn cartilage causes knee stiffness and pain, often worse on stairs.
Learn more →Spider Veins
Small surface veins that show as thin red or blue lines on the legs.
Learn more →Varicose Veins
Bulging, ropey veins from valves that no longer close properly.
Learn more →Deep Vein Thrombosis
A clot in a deep leg vein, which is a medical emergency.
Learn more →Peripheral Neuropathy
Nerve damage causing numbness, tingling, or burning.
Learn more →Peripheral Artery Disease
Narrowed arteries reduce blood flow, often felt as pain when walking.
Learn more →Chronic Venous Insufficiency
Poor vein return causing swelling, aching, and skin changes.
Learn more →Lymphedema
Swelling from a build-up of lymph fluid in the tissues.
Learn more →Nerve Compression
Pressure on a nerve causing tingling, pain, or weakness in the leg.
Learn more →When leg swelling is an emergency
Some swelling needs urgent care. Seek emergency care now if you have:
- Sudden swelling in one leg with pain or warmth (possible clot or DVT)
- Chest pain or shortness of breath with leg swelling
- Skin over the swelling that is red, hot, and tender (possible infection)
- An open sore or wound that will not heal
- Rapidly worsening swelling
- Swelling after a long flight or period of bed rest
What a specialist can do
A leg and vascular specialist will examine both legs, check your pulses and skin, and ask about your health history. Painless tests help find the cause:
- Venous ultrasound: checks the leg veins for reflux or a clot without any needles.
- Health review: looks at heart, kidney, thyroid, and medication factors when both legs swell.
- Skin and pulse exam: helps tell vein disease from lymphedema or other causes.
Treatment depends on the cause and often includes compression, elevation, movement, and, for vein disease, minimally invasive procedures that are done in an office rather than surgery.
How Help My Legs works
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Questions people ask about leg swelling
Why are my ankles swollen at the end of the day?
Fluid tends to pool in the lower legs when you are upright, so mild swelling that builds through the day and eases overnight is common. If it is persistent, painful, or getting worse, a specialist can check whether the veins are involved.
Is swelling in one leg serious?
One-sided swelling deserves attention, especially if it comes on suddenly with pain, warmth, or redness, because it can signal a blood clot. Get urgent care for sudden one-leg swelling, and see a specialist for swelling that persists.
Does leg swelling mean a heart problem?
Not always. Swelling in both legs can relate to the heart, but it is more often linked to the veins, and it can also involve the kidneys, thyroid, or medications. An evaluation can sort out the cause.
What helps reduce leg swelling?
Elevating the legs, moving regularly, compression stockings, and limiting salt can help. If a vein condition is behind it, treating that condition is the most effective step.
Tired of swollen, puffy legs?
Get matched with a specialist near you who can find the cause of your swelling and help you feel better.
Find a Specialist Near YouLast updated July 2026