Leg swelling happens when excess fluid gets trapped in the tissue beneath your skin, and in most cases you can reduce it with a combination of elevation, movement, and dietary changes. The underlying cause matters, though. Swelling in both legs often points to something systemic like fluid retention from too much sodium or a medication side effect, while swelling in just one leg can signal a more urgent problem like a blood clot. Here’s how to bring the swelling down and when to take it more seriously.
Why Fluid Pools in Your Legs
Your body constantly moves fluid between your bloodstream and the surrounding tissue. Swelling occurs when that exchange gets thrown off balance. Several things can tip the scale: higher pressure inside your blood vessels pushes more fluid out, weakened vessel walls let fluid leak through too easily, or your lymphatic system (the network that drains excess fluid) falls behind. Gravity does the rest. When you sit or stand for hours, fluid naturally settles into your feet and ankles because there’s no muscle activity pushing it back up toward your heart.
Elevate Your Legs Above Your Heart
The simplest and most effective immediate relief is elevation. Lie down and prop your legs on pillows so they sit above the level of your heart. This reverses the gravitational pull that trapped fluid in your lower legs in the first place. Aim for about 15 minutes per session, three to four times a day. If you work at a desk, even putting your feet up on a stool during the day helps slow fluid accumulation, though it won’t be as effective as lying flat with your legs raised overhead.
Use Your Calf Muscles as a Pump
Your calf muscles act as a second heart for your lower body. When they contract during walking, they squeeze the deep veins in your legs and push blood upward toward your heart. This action drops the pressure inside your foot veins by 60% to 80%, which dramatically reduces the force that pushes fluid out of your blood vessels and into surrounding tissue. When you stop moving, that pressure climbs right back up.
Walking is the most natural way to activate this pump, but even small movements help when you’re stuck at a desk or on a plane. Flexing your feet up and down (pointing your toes toward your shins, then pressing them away) engages the calf and creates measurable pressure changes in the veins. Try doing 20 to 30 of these ankle pumps every hour if you’re sitting for long stretches. Calf raises while standing work the same way. The key is rhythmic contraction and release, which alternately squeezes blood out of the leg veins and then lets them refill.
Cut Back on Sodium
Sodium causes your body to hold onto water. The more sodium you consume, the more fluid your kidneys retain, and some of that extra volume ends up in your legs. The American Heart Association recommends no more than 2,300 milligrams of sodium per day, with an ideal target of 1,500 milligrams for most adults. For context, a single teaspoon of table salt contains about 2,300 milligrams, and most processed and restaurant foods are loaded with it.
The biggest sources tend to be bread, deli meats, canned soups, frozen meals, pizza, and condiments like soy sauce. Reading nutrition labels and cooking more meals at home gives you the most control. Many people notice a visible reduction in leg swelling within a few days of cutting sodium intake significantly.
Check Your Medications
Several common medications cause leg swelling as a side effect, and calcium channel blockers (a widely prescribed class of blood pressure medication) are among the most frequent culprits. Ankle swelling affects anywhere from 1% to 15% of people taking these drugs at standard doses. At higher doses taken long-term, the rate can exceed 80%. The swelling also tends to get worse over time rather than resolving on its own, with one large study of elderly patients finding that it increased gradually the longer treatment continued.
Other medications known to cause fluid retention include certain diabetes drugs, steroids, hormonal therapies like estrogen, and some anti-inflammatory painkillers. If your leg swelling started or worsened after beginning a new medication, that connection is worth exploring with whoever prescribed it. Stopping or switching medications on your own can be dangerous, but your prescriber may have alternatives that don’t cause this side effect.
Compression Stockings
Compression stockings apply graduated pressure to your legs, tightest at the ankle and loosening as they go up. This external pressure counteracts the forces that push fluid into your tissue and supports your veins in moving blood back toward your heart. They’re especially useful if you stand or sit for long periods, travel frequently, or have chronic venous insufficiency. Knee-high stockings with 15 to 20 mmHg of pressure are available without a prescription and work well for mild swelling. Higher pressures (20 to 30 mmHg or above) are more effective for moderate swelling but may require a fitting to ensure they work properly and don’t cut off circulation at the knee or thigh.
Put them on first thing in the morning before swelling has a chance to build up. If your legs are already swollen, elevate them for 15 minutes first, then put the stockings on.
How to Tell Mild Swelling From Something Serious
You can get a rough sense of severity by pressing a finger into the swollen area for about five seconds. If it leaves a temporary dent, that’s called pitting edema. A shallow 2-millimeter indent that bounces back immediately is grade 1, the mildest form. A deeper indent (8 millimeters) that takes two to three minutes to fill back in is grade 4 and typically needs medical evaluation.
Swelling in both legs that develops gradually is usually related to prolonged sitting, sodium intake, medication side effects, or chronic venous insufficiency. Swelling in just one leg deserves more attention. A blood clot in a deep vein (DVT) typically causes one-sided swelling along with pain or cramping that starts in the calf, skin that looks red or purple, and warmth over the affected area. If you notice those symptoms, especially after a period of immobility like a long flight or recovery from surgery, get it evaluated promptly.
The most dangerous complication of a leg blood clot is when a piece breaks off and travels to the lungs. Warning signs of this include sudden shortness of breath, chest pain that worsens with deep breathing or coughing, a rapid pulse, dizziness or fainting, and coughing up blood. These symptoms require emergency care.
Swelling That Doesn’t Respond to Home Measures
If you’ve been elevating consistently, moving regularly, wearing compression, and watching your sodium for a couple of weeks without improvement, the swelling likely has an underlying cause that needs to be identified. Bilateral leg swelling that persists can be associated with heart failure, kidney problems, liver disease, thyroid disorders, or chronic venous insufficiency. Each of these has distinct patterns. Heart-related swelling often worsens throughout the day and improves overnight. Kidney-related swelling may show up around the eyes in the morning in addition to the legs. Lymphedema, where the drainage system itself is damaged, often starts soft and pitting but over time becomes firm and doesn’t indent when pressed.
Persistent swelling isn’t something to just live with. Beyond discomfort, chronic fluid buildup stretches the skin, slows wound healing, and increases infection risk. Identifying and treating the root cause is what ultimately resolves it, while the strategies above manage the symptom in the meantime.