Elevating your legs, cutting back on salt, staying active, and wearing compression stockings are the most effective steps you can take for leg swelling. Most swelling in the legs is caused by fluid pooling in the tissues, a condition called edema, and the right approach depends on whether the swelling is in both legs or just one, how suddenly it appeared, and what’s driving it.
Why Legs Swell
Fluid in your body is constantly moving between your blood vessels and the surrounding tissue. When the pressure inside your veins increases, when vessel walls become leaky, or when your lymphatic system can’t drain fluid fast enough, that fluid builds up in your legs, ankles, and feet. Gravity makes it worse: sitting or standing for long stretches lets fluid settle in the lowest parts of your body.
The most common culprit is chronic venous insufficiency, where damaged valves in the leg veins can’t push blood back toward the heart efficiently. This typically causes swelling in both legs that gets worse through the day and improves overnight. Heart failure produces a similar pattern because blood backs up in the veins when the heart can’t pump strongly enough. Kidney disease also causes bilateral swelling but often shows up around the eyes as well, because the kidneys can’t clear excess fluid and salt from the blood. Swelling in just one leg is a different story and usually points to something localized: a blood clot, an infection, or a blockage in the lymphatic drainage on that side.
Elevate Your Legs the Right Way
Elevation is the simplest and fastest relief. Raise your feet above the level of your heart three or four times a day for about 15 minutes each session. Lying on a couch with your legs propped on two or three pillows works well. The key detail is “above the heart,” not just slightly raised. When your legs are higher than your chest, gravity helps fluid drain back into circulation instead of pooling at your ankles.
Elevation works especially well for swelling related to venous insufficiency or prolonged sitting. It won’t resolve swelling caused by a blood clot or infection, so if the puffiness doesn’t improve with elevation or keeps coming back, that’s a signal to look deeper.
Cut Sodium to Reduce Fluid Retention
Salt makes your body hold onto water, and for people with edema, even moderate sodium intake can keep the swelling going. Georgetown University’s nephrology department recommends that people with edema limit 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 of sodium aren’t what you’d expect. Most of it comes from packaged and restaurant food, not the salt shaker. Canned soups, deli meats, frozen meals, bread, and condiments are the usual offenders. Reading nutrition labels and cooking more meals from scratch are the two changes that move the needle most. You don’t need to eliminate salt entirely, but staying under that 1,800 mg ceiling makes a noticeable difference in how much fluid your body retains.
Compression Stockings and Pressure Levels
Compression stockings squeeze your legs in a graduated pattern, tighter at the ankle and looser toward the knee, which helps push fluid upward. Research shows that even light compression in the range of 10 to 15 mmHg is effective at preventing swelling and relieving leg complaints for people who sit or stand for long hours. Stockings in the 15 to 20 mmHg range produce significant reductions in swelling within just two days of use. Stepping up to 20 to 30 mmHg provides even greater benefit, particularly for people who sit most of the day.
For mild, everyday swelling, over-the-counter knee-high stockings in the 15 to 20 mmHg range are a reasonable starting point. If you have diagnosed venous insufficiency or more persistent swelling, a higher compression level may be more appropriate. The stockings should feel snug but not painful. Put them on first thing in the morning before swelling starts, and remove them at bedtime.
Move More, Even in Small Ways
Your calf muscles act as a pump for your veins. Every time you flex your ankle or take a step, those muscles squeeze the veins and push blood upward. When you sit still for hours, that pump shuts off and fluid accumulates.
Ankle pump exercises are one of the simplest fixes. Point your toes down, then pull them up toward your shin, repeating every 3 to 4 seconds. A systematic review of the research found this pace to be the most effective frequency for improving blood flow in the lower legs. You can do these at your desk, on a plane, or in bed.
If your job keeps you seated, alternating between sitting and standing in short intervals helps significantly. A study comparing different positions found that switching between sitting and standing every minute for just 20 minutes prevented the fluid buildup that occurred during uninterrupted sitting or standing alone. You don’t need a formal sit-stand desk routine. Getting up to refill water, walking to a colleague’s desk instead of emailing, or simply standing during phone calls all count. The core message from the research: even small, brief movements reduce leg swelling.
When Swelling Signals Something Serious
Swelling that appears suddenly in one leg, especially with warmth, redness, tenderness, or pain, could indicate a deep vein thrombosis (a blood clot). This requires urgent evaluation, typically within hours, not days. A clot that breaks loose can travel to the lungs, which is a life-threatening emergency.
Swelling in both legs that develops alongside shortness of breath may point to heart failure or fluid buildup in the lungs. Swelling around the eyes combined with puffy legs can signal kidney problems. And swelling that pits when you press a finger into it (leaving a temporary dent) often indicates a systemic cause like heart, liver, or kidney disease rather than a local vein problem.
Chronic, stable swelling that’s been present for weeks or months is less urgent but still worth investigating. Identifying the underlying cause, whether it’s venous insufficiency, a medication side effect (calcium channel blockers and certain anti-inflammatory drugs are common triggers), or a lymphatic issue, determines which combination of treatments will actually work long-term.
Medical Treatments for Persistent Swelling
When lifestyle measures aren’t enough, doctors often prescribe water pills (diuretics) to help your kidneys flush out excess sodium and water. These reduce total fluid volume in your body and can bring down swelling within days. They’re most useful when the swelling is driven by heart failure, kidney disease, or liver problems.
For venous insufficiency specifically, the 2023 guidelines from the Society for Vascular Surgery recommend that patients who are candidates for a procedure should consider venous intervention over long-term compression stockings. Modern procedures seal off or remove the faulty veins through minimally invasive techniques, and they tend to provide better symptom relief than compression alone. Compression therapy after the procedure is typically recommended for at least one week to manage pain.
Lymphedema, where the lymphatic drainage system itself is impaired, requires a different approach. Compression, manual lymphatic drainage (a specialized form of massage), and specific wrapping techniques are the mainstays. Diuretics generally don’t help with lymphedema because the problem isn’t excess fluid production but impaired drainage.
For people who aren’t candidates for procedures or are waiting for treatment, plant-based supplements containing flavonoids have shown modest benefit for vein-related pain, heaviness, and the sensation of swelling, though they’re not a substitute for the strategies above.