Leg swelling happens when fluid leaks out of tiny blood vessels and pools in the tissues of your lower legs, ankles, or feet. The fastest way to start reducing it is to lie down and prop your legs above the level of your heart for 15 minutes, three to four times a day. But lasting relief depends on identifying why the swelling is happening and addressing the root cause, whether that’s too much salt, too little movement, a medication side effect, or an underlying health condition.
Why Legs Swell in the First Place
Your body constantly moves fluid between your bloodstream and the surrounding tissues. Two main forces keep this in balance: the pressure inside your blood vessels pushing fluid out, and proteins in your blood (especially one called albumin) pulling fluid back in. When something tips that balance, fluid accumulates in your tissues instead of returning to your veins.
The legs are especially vulnerable because gravity works against the return of blood and fluid to the heart. Sitting or standing for long stretches makes it worse. On top of that pressure imbalance, your kidneys may respond by holding onto extra sodium and water, which adds even more volume to the system. That’s why swelling tends to worsen over the course of the day and improve overnight when you’re lying flat.
Elevate Your Legs the Right Way
Elevation is the simplest and most immediate tool. The key detail most people get wrong is height: your legs need to be above your heart, not just propped on an ottoman. Lying on your back with your legs resting on a stack of pillows or up against a wall works well. Aim for 15 minutes per session, three to four times daily. This uses gravity to help fluid drain back toward your core and into your circulatory system.
If you can only manage once or twice a day, do it in the evening when swelling peaks. Even a single session before bed can noticeably reduce overnight puffiness and morning stiffness.
Use Compression Stockings
Compression stockings apply gentle, graduated pressure to your legs, squeezing tightest at the ankle and easing up toward the knee or thigh. This helps push fluid back into your veins and prevents it from pooling. They come in several pressure levels, measured in millimeters of mercury (mmHg).
- 15 to 20 mmHg (mild): Good for very early or mild swelling, long flights, or if you’re new to compression and building tolerance.
- 20 to 30 mmHg (moderate): The most commonly prescribed level for everyday wear. Balances effectiveness with comfort and works well for mild to moderate swelling after injuries, surgery, or venous insufficiency.
- 30 to 40 mmHg (firm): Used for more significant lower leg swelling, particularly when moderate stockings aren’t enough, or when there’s thickened, fibrotic tissue involved.
- 40 to 50 mmHg and above: Reserved for severe cases and only after a clinical assessment.
Put them on first thing in the morning before swelling has a chance to build. If you wait until your legs are already puffy, they’ll be harder to pull on and less effective. You can buy mild compression stockings over the counter, but anything 20 mmHg or above is worth discussing with a provider to make sure the fit and pressure level are right for you.
Cut Back on Sodium
Sodium tells your kidneys to hold onto water, which increases your blood volume and pushes more fluid into your tissues. For people actively managing fluid retention, Georgetown University’s nephrology department recommends limiting sodium to roughly 1,400 to 1,800 mg per day. That’s significantly less than the average American intake of around 3,400 mg.
The biggest sources are rarely the salt shaker. Processed and packaged foods, restaurant meals, canned soups, deli meats, and condiments like soy sauce account for most dietary sodium. Reading nutrition labels is the single most effective habit change. Swapping canned vegetables for frozen, cooking more meals at home, and seasoning with herbs, citrus, or vinegar instead of salt can make a meaningful difference within days.
Move More, Sit and Stand Less
Both prolonged sitting and prolonged standing contribute to swelling. Your calf muscles act as a pump for your veins, squeezing blood upward toward your heart with every step. When you’re stationary, that pump shuts off and fluid pools.
If you have a desk job, alternate between sitting and standing throughout the day, and take short walking breaks every 30 to 60 minutes. Even simple calf raises at your desk (rising onto your toes and lowering back down) activate the muscle pump. Walking, swimming, and cycling are all effective for keeping fluid circulating. The goal isn’t intense exercise. It’s consistent, frequent movement that prevents long stretches of inactivity.
Check Your Medications
Several common medications cause leg swelling as a side effect, and many people don’t realize the connection. The most frequent culprits include:
- Blood pressure medications called calcium channel blockers (such as amlodipine and nifedipine), which widen small arteries and increase pressure in the capillaries, pushing fluid into surrounding tissue.
- Nerve pain medications like gabapentin and pregabalin, which cause a similar type of artery widening.
- Diabetes medications in the thiazolidinedione class (such as pioglitazone), which cause the kidneys to retain sodium and water while also making blood vessel walls leakier.
- Anti-inflammatory painkillers (NSAIDs) like ibuprofen and naproxen, which promote sodium retention.
If your swelling started or worsened after beginning a new medication, that’s worth a conversation with your prescriber. Stopping or switching the drug often resolves the swelling, but don’t make changes on your own since abruptly stopping some medications can be dangerous.
Horse Chestnut Seed Extract
For swelling related to poor vein function (chronic venous insufficiency), horse chestnut seed extract is one of the few supplements with real clinical backing. A review of 13 randomized controlled trials found that it reduced lower leg volume, decreased calf and ankle circumference, and lowered the rate at which fluid leaked through capillary walls by 22% in one study. It works by protecting the structural proteins in blood vessel walls from breaking down, which helps keep fluid where it belongs.
The effective dose in studies was 100 to 150 mg daily of its active component, escin. Improvements showed up within two weeks at doses of 100 mg. Look for products standardized to escin content. It’s generally well tolerated, but it’s not appropriate for everyone, particularly people with kidney or liver problems.
When Swelling Signals Something Serious
One of the most important things to notice is whether the swelling affects one leg or both. This distinction points toward very different causes.
Swelling in both legs is more commonly tied to systemic issues: heart failure, kidney disease, liver disease, or medication side effects. These conditions affect your whole body’s fluid balance, so both legs swell roughly equally. Both-leg swelling that developed gradually and worsens over weeks or months warrants medical evaluation but is rarely an emergency on its own.
Swelling in one leg demands closer attention. The most common cause (about 40% of cases) is a muscle strain or injury. But one-sided swelling can also signal a deep vein thrombosis (DVT), a blood clot in a deep leg vein that can be dangerous if it travels to the lungs. Other causes include infections (cellulitis), a cyst behind the knee, lymphatic blockage, or chronic vein disease. If one leg suddenly swells and you also have pain, warmth, redness, or recent immobility (long flight, surgery, bed rest), seek medical evaluation promptly. Ultrasound can quickly confirm or rule out a clot.
When Doctors Prescribe Diuretics
Diuretics, sometimes called “water pills,” work by telling your kidneys to release more sodium and water into your urine, reducing the total fluid volume in your body. Doctors prescribe them when swelling is caused by conditions like heart failure, kidney disease, or liver cirrhosis, where the body is retaining far more fluid than lifestyle changes alone can manage.
They’re not typically a first-line option for garden-variety swelling from sitting too long or eating too much salt. Diuretics come with their own side effects, including dehydration, low potassium, dizziness, and kidney strain, so they’re reserved for situations where the underlying cause clearly calls for them. If your swelling persists despite consistent elevation, compression, sodium reduction, and regular movement, that’s the point at which medical evaluation and possible medication become appropriate.