Ankle swelling happens when fluid pools in the tissue around your ankles, usually because gravity has been working against you all day. The good news: most cases respond well to simple daily habits. Elevating your legs above heart level for just 15 minutes, three to four times a day, is one of the most effective ways to push that fluid back into circulation. But elevation alone isn’t always enough, and the best approach combines movement, compression, diet, and knowing when swelling signals something more serious.
Why Ankles Swell in the First Place
Your veins and lymph vessels work against gravity to push fluid back up from your feet toward your heart. When you sit or stand still for long periods, that system struggles. Fluid leaks out of small blood vessels into surrounding tissue, and your ankles, being the lowest point, collect the most. Excess sodium in your diet makes it worse by causing your body to hold onto more water. Medications like blood pressure drugs, hormones, and anti-inflammatory painkillers can also contribute. Heat, pregnancy, and carrying extra weight all increase the likelihood of puffy ankles by the end of the day.
Move Regularly Throughout the Day
Prolonged sitting causes more lower-leg swelling than standing does. A 2022 crossover trial found that 20 minutes of uninterrupted sitting produced significantly more fluid accumulation in the lower legs than 20 minutes of standing. The most effective condition in the study was alternating between sitting and standing every minute, which essentially prevented swelling altogether.
You don’t need a precise schedule. The practical takeaway is to break up long stretches of sitting every 20 to 30 minutes. Stand up, walk to the kitchen, do a few calf raises, or simply shift positions. Calf raises are especially useful because contracting your calf muscles squeezes the veins in your lower legs and actively pumps fluid upward. If you work at a desk, flexing and pointing your feet under the table accomplishes something similar.
Elevate Your Legs the Right Way
Elevation works, but only if your legs are actually above the level of your heart. Propping your feet on a low ottoman doesn’t do much. Lie down on a couch or bed and stack pillows under your calves and ankles so they’re higher than your chest. Hold this position for about 15 minutes, and aim for three to four sessions spread throughout the day. Many people find it easiest to do this once in the morning, once after work, and once before bed. If you can only manage it once, the end of the day, when swelling peaks, gives you the most noticeable relief.
Cut Back on Sodium
Salt causes your body to retain water, and that extra fluid tends to settle in your lower extremities. The general recommendation for people managing fluid retention is to stay under 2,000 to 2,300 milligrams of sodium per day. Most people consume well over 3,400 milligrams daily, so even modest reductions help. The biggest culprits aren’t the salt shaker on your table. They’re processed foods: canned soups, deli meats, frozen meals, soy sauce, and restaurant dishes. Reading nutrition labels and cooking more meals at home are the two changes that make the biggest difference. Increasing your potassium intake through bananas, sweet potatoes, and leafy greens also helps your kidneys flush out excess sodium.
Use Compression Stockings
Compression stockings apply graduated pressure to your lower legs, with the tightest squeeze at the ankle and decreasing pressure moving upward. This supports your veins and prevents fluid from pooling. They come in different pressure classes:
- Class 1 (under 20 mmHg): Mild compression for occasional, minor swelling. Available over the counter and a good starting point for most people.
- Class 2 (20 to 30 mmHg): Medium compression for moderate or recurring swelling and mild varicose veins.
- Class 3 (over 30 mmHg): High compression for more severe swelling, significant varicose veins, or chronic venous insufficiency. These typically require a prescription or professional fitting.
Put them on first thing in the morning before swelling starts. Trying to pull them on over already-swollen ankles is both difficult and less effective. Knee-high styles are sufficient for ankle swelling. If you find full stockings uncomfortable, compression socks with open toes are widely available and easier to tolerate in warm weather.
Preventing Swelling During Travel
Long flights and car rides are a perfect storm for ankle swelling: you’re sitting still, your legs are bent at the knee, and cabin pressure on planes further affects circulation. Wearing compression stockings during any trip longer than three or four hours noticeably reduces swelling. Beyond that, get up and walk the aisle every hour or so on a flight. On road trips, plan stops where you can walk around for a few minutes. While seated, rotate your ankles in circles, pump your feet up and down, and avoid crossing your legs. Staying hydrated helps too, since dehydration actually makes your body hold onto more fluid rather than less.
Other Habits That Help
Staying physically active in general improves your circulation over time. Walking, swimming, and cycling all strengthen the calf muscles that act as pumps for your venous system. Even 30 minutes of moderate activity most days of the week makes a measurable difference in how much your ankles swell by evening.
Excess body weight puts additional pressure on your veins, making it harder for blood to return to your heart efficiently. Losing even a modest amount of weight can reduce the severity of daily swelling. Wearing shoes that restrict your feet, particularly tight heels or stiff flats without support, can also worsen the problem by limiting ankle movement and calf engagement throughout the day.
When Swelling Signals Something Serious
Most ankle swelling is harmless and responds to the strategies above. But certain patterns warrant prompt medical attention.
Swelling in only one leg, especially if it comes on suddenly with pain, warmth, or redness, needs urgent evaluation. This pattern is a hallmark of deep vein thrombosis (a blood clot in the leg), which can become dangerous if the clot travels to the lungs. The risk is higher if you’ve recently been immobile after surgery, a long trip, or an illness.
Swelling in both legs that develops rapidly could indicate a heart, kidney, or liver problem. Pay attention to accompanying symptoms: shortness of breath, difficulty breathing while lying flat, unexplained weight gain over a few days, or a swollen abdomen alongside swollen legs all point toward something systemic rather than simple fluid pooling.
If you press a finger into your swollen ankle and the indentation stays visible for more than a few seconds, that’s called pitting edema. Mild pitting that bounces back immediately is common and usually benign. Deeper pits that take 15 seconds to a minute or longer to refill suggest more significant fluid retention that’s worth investigating. Swelling that doesn’t improve with elevation, gets progressively worse over weeks, or appears alongside skin changes like thickening, discoloration, or open sores also warrants a closer look from a healthcare provider.