Swollen feet and ankles usually improve with a combination of elevation, movement, compression, and dietary changes. The right approach depends on whether your swelling is from standing all day, a medication side effect, or an underlying health condition. Most mild to moderate edema responds well to home strategies, but persistent or sudden swelling sometimes signals something that needs medical attention.
Why Fluid Pools in Your Feet
Your body constantly moves fluid between your blood vessels and surrounding tissues. Two opposing forces keep this in balance: pressure inside your capillaries pushes fluid out, while proteins like albumin in your blood pull fluid back in. When something tips this balance, fluid leaks into the tissue around your ankles and feet and stays there.
Several things can cause this shift. Gravity is the simplest one: standing or sitting for hours raises the pressure in your leg veins, forcing more fluid out than your body can reabsorb. Excess sodium causes your kidneys to hold onto water, expanding your blood volume and increasing that outward pressure further. Heart, kidney, or liver conditions can disrupt the balance more seriously, and so can medications, pregnancy, or damaged veins. Once fluid accumulates, your kidneys may compensate by retaining even more sodium and water, which can make swelling worse if the underlying cause isn’t addressed.
One Leg vs. Both Legs Matters
Swelling in both feet and ankles at the same time usually points to a systemic cause: too much salt, prolonged sitting, a medication side effect, or conditions like heart failure or kidney disease. The most common cause of chronic bilateral leg swelling is venous insufficiency, where the valves in your leg veins weaken over time.
Swelling in just one leg is a different situation. Acute one-sided swelling is commonly caused by a blood clot (deep vein thrombosis), especially if the leg is also warm, red, or tender. It can also result from an injury, infection, or a Baker’s cyst behind the knee. Chronic one-sided swelling is more often from venous insufficiency or lymphedema. The distinction matters because treatments differ significantly, and a sudden swollen leg with warmth or pain needs prompt evaluation.
Elevate Your Legs the Right Way
Leg elevation is the most immediate thing you can do to reduce swelling, but the angle and duration matter. Research comparing different elevation angles found a clear relationship: higher angles drain more fluid. Lying flat helps some, but elevating your legs to 30 degrees above heart level for 15 to 30 minutes produces a meaningful reduction. An angle of 45 degrees or more is even more effective. A study found statistically significant improvement at the highest elevation compared to simply lying flat.
In practical terms, this means stacking two or three pillows under your calves while lying on your back, or resting your feet on the arm of a couch so they’re clearly above your chest. Doing this two to three times a day, for at least 15 minutes each session, is a reasonable target. If you work at a desk, even propping your feet on a low stool during the day can slow fluid accumulation.
Use Ankle Exercises to Pump Fluid Upward
Your calf muscles act as a pump for your veins. Every time they contract, they squeeze blood and fluid upward toward your heart. Sitting still for hours switches that pump off, which is one reason your ankles swell on long flights or at desk jobs.
Ankle pump exercises are the simplest way to activate this system. Point your toes down as far as possible, then pull them up toward your shin as far as possible. Hold each position for about one second, and repeat. Research on these exercises found that doing them for five-minute sessions at a pace of about 30 repetitions per minute effectively boosts venous return. That’s roughly one full up-and-down motion every two seconds. Doing these throughout the day, especially during long periods of sitting, can prevent swelling from building up in the first place.
Walking is equally effective. Even a five-minute walk every hour engages the calf pump continuously and helps your body clear fluid from the lower legs.
Compression Stockings: Choosing the Right Pressure
Compression stockings work by applying gentle external pressure to your legs, counteracting the force that pushes fluid out of your capillaries. They’re most effective when put on first thing in the morning before swelling has a chance to develop.
For occupational swelling (from standing or sitting at work), stockings in the 15 to 20 mmHg range are a good starting point. Research shows this level significantly reduces swelling within just a couple of days of regular use. Stockings in the 20 to 30 mmHg range provide additional benefit and are typically recommended for moderate edema or chronic venous insufficiency. Higher pressures exist but generally require a fitting from a healthcare provider.
Compression is not safe for everyone. If you have peripheral arterial disease, diabetes with circulation problems, skin infections, or open wounds on your legs, compression stockings can restrict blood flow and cause harm. If you’re unsure about your circulation, it’s worth checking before you start wearing them regularly.
Cut Back on Sodium
Sodium directly drives fluid retention. When you eat more salt than your kidneys can efficiently clear, your body holds onto extra water to keep sodium concentrations balanced. This expands your blood volume and increases the pressure that pushes fluid into your tissues.
Guidelines for people with fluid retention suggest limiting sodium to 2,000 to 3,000 mg per day, with a stricter target of under 2,000 mg for more significant swelling or heart failure. For context, one teaspoon of table salt contains about 2,300 mg of sodium, and many restaurant meals contain well over 2,000 mg in a single dish.
The biggest sources of hidden sodium aren’t the salt shaker but processed and packaged foods: canned soups, deli meats, frozen meals, bread, condiments, and restaurant food. Reading nutrition labels and cooking at home more often are the two changes that make the most practical difference. Many people see a noticeable reduction in ankle swelling within a few days of cutting sodium intake.
Check Your Medications
Certain blood pressure medications are a common and underrecognized cause of foot and ankle swelling. Calcium channel blockers, a widely prescribed class of blood pressure drugs, cause peripheral edema in roughly 10.7% of people taking them, compared to about 3% on placebo. After six months of use, that rate climbs to about 24%, nearly one in four patients. Higher doses make it significantly worse: edema occurs about three times more often at high doses than low doses.
Other medications that can cause swelling include certain diabetes drugs, anti-inflammatory painkillers (NSAIDs), steroids, and some hormone therapies. If your swelling started or worsened after beginning a new medication, that connection is worth raising with your prescriber. Sometimes a dose adjustment or switch to a different medication resolves the problem entirely.
When Edema Needs Medical Treatment
If home measures aren’t enough, your doctor may prescribe diuretics (water pills) to help your kidneys excrete excess fluid. These are particularly common when edema is related to heart failure, kidney disease, or liver problems. Diuretics work by blocking sodium reabsorption in the kidneys, which pulls water out along with it. You’ll typically notice increased urination within a few hours of taking them.
The choice of diuretic and the dose depend heavily on the underlying cause and how well your kidneys are functioning. Some oral formulations are absorbed more predictably than others, which matters if you have significant swelling in your gut that could interfere with absorption. Your doctor will likely monitor your weight, kidney function, and electrolyte levels while you’re on these medications, since they can lower potassium and affect kidney function if not managed carefully.
How to Tell If Your Swelling Is Serious
You can get a rough sense of severity by pressing a finger firmly into the swollen area for about five seconds and then releasing. If the skin bounces back immediately and leaves only a shallow 2 mm dent, that’s mild (grade 1). If it leaves a deeper pit that takes 15 to 60 seconds to refill, that’s moderate (grade 3). The most severe form leaves an 8 mm pit that takes two to three minutes to rebound.
Seek emergency care if you experience sudden, unexplained swelling in just one leg, especially if it’s accompanied by warmth, redness, or tenderness. Swelling paired with chest pain, difficulty breathing, coughing up blood, or fever also requires immediate attention. These combinations can indicate a blood clot, heart failure, or infection that needs urgent treatment.