Swollen ankles happen when tiny blood vessels leak fluid into surrounding tissue faster than your body can clear it away. The good news: most cases respond well to simple strategies you can start today. Elevating your legs, cutting back on salt, wearing compression socks, and staying active all help move trapped fluid back into circulation.
Why Fluid Pools in Your Ankles
Gravity is the main reason your ankles bear the brunt of fluid buildup. When you sit or stand for long stretches, blood and fluid naturally settle into the lowest point of your body. Normally, one-way valves in your leg veins push blood back up toward your heart, and your lymphatic system drains excess fluid from tissues. But when those systems are overwhelmed or damaged, fluid accumulates and your ankles swell.
Common triggers include prolonged sitting or standing, high sodium intake, pregnancy, and being overweight. Chronic venous insufficiency, where the valves in leg veins weaken and allow blood to pool, is one of the most frequent underlying causes. Heart, liver, or kidney problems can also drive fluid retention throughout the body, with the ankles showing it first.
Certain medications cause ankle swelling as a side effect. Blood pressure drugs called calcium channel blockers are well-known culprits, causing ankle swelling in 1 to 15 percent of people who take them. Steroids, some diabetes medications, and hormone therapies can also contribute. If your swelling started around the same time as a new prescription, that connection is worth exploring with your prescriber.
Elevate Your Legs Above Your Heart
Elevation is the simplest and fastest way to start draining fluid from swollen ankles. The key detail most people miss: your legs need to be above the level of your heart, not just propped on an ottoman. Lying on a couch or bed with your legs resting on a stack of pillows works well. Aim for about 15 minutes per session, three to four times a day. You’ll often notice your ankles feel less tight within the first session, though consistent daily elevation produces the best results over time.
Use Compression Socks
Compression stockings apply steady pressure to your lower legs, preventing fluid from settling into the tissue around your ankles. They work best when you put them on first thing in the morning, before swelling has a chance to build up during the day.
Compression levels are measured in millimeters of mercury (mmHg), and the right level depends on how much swelling you’re dealing with:
- 8 to 15 mmHg (mild): Good for tired, achy legs with minor puffiness. Available over the counter.
- 15 to 20 mmHg (moderate): Helpful for regular minor swelling and long travel days. Also widely available without a prescription.
- 20 to 30 mmHg (firm): Medical-grade compression for moderate swelling, varicose veins, or post-surgical recovery. Often recommended by a clinician.
- 30 to 40 mmHg (extra-firm): Reserved for severe swelling and venous ulcers. Typically prescribed.
Starting with a moderate pair (15 to 20 mmHg) is reasonable for most people with everyday ankle swelling. If that level doesn’t make a noticeable difference after a couple of weeks, stepping up to firm compression is the next move.
Cut Your Sodium Intake
Salt makes your body hold onto water. When sodium levels in your blood rise, your kidneys retain extra fluid to keep the concentration balanced, and that fluid often ends up in your ankles and feet. Reducing your sodium intake to around 2,000 mg per day is a widely used target for people managing fluid retention. That’s roughly one teaspoon of table salt for the entire day, including what’s already in your food.
The biggest sources of hidden sodium aren’t the salt shaker. Processed foods, canned soups, deli meats, restaurant meals, bread, and condiments like soy sauce account for the majority of what most people consume. Reading nutrition labels and cooking more meals at home are the two changes that tend to make the biggest difference. Seasoning with herbs, citrus, vinegar, or spices can replace some of the flavor you lose when you cut back on salt.
Move Your Calf Muscles Regularly
Your calf muscles act as a pump for your circulatory system. Every time they contract, they squeeze the veins in your lower legs and push blood and fluid upward against gravity. When you sit still for hours, that pump essentially shuts off and fluid accumulates.
Ankle pumps are one of the easiest exercises to keep things moving. Sit or lie down with your legs extended, then alternately point your toes toward your knees and away from you, flexing and extending as far as comfortable. Do this for two to three minutes, and repeat two to three times per hour when you’re sitting for extended periods. Walking, even short laps around your home or office every 30 to 60 minutes, also activates the calf pump effectively.
Preventing Swelling During Travel
Long flights and car rides are a perfect setup for swollen ankles. You’re sitting in a cramped position, often slightly dehydrated, for hours at a time. Wearing compression stockings during travel is one of the most effective preventive steps. The Mayo Clinic specifically recommends them for long flights, noting they also lower the risk of blood clots.
Beyond compression, get up and walk the aisle every hour or two on a flight. If you can’t stand, do ankle pumps in your seat. Stay hydrated with water rather than alcohol or caffeine, both of which can contribute to dehydration and make swelling worse. If you notice swelling in just one leg that persists or develops within two weeks after a long flight, that warrants prompt medical attention since it can signal a blood clot.
Stay Hydrated (It Helps, Not Hurts)
It sounds counterintuitive, but drinking enough water actually helps reduce fluid retention rather than making it worse. When you’re dehydrated, your body responds by holding onto whatever fluid it has, which can worsen swelling. Adequate hydration keeps your kidneys flushing sodium and waste products efficiently, which helps regulate fluid balance. Plain water throughout the day is the simplest approach.
Eat Enough Potassium
Potassium works opposite to sodium in your body. It helps your kidneys excrete excess sodium, which in turn reduces the amount of fluid your body retains. Most people don’t get enough potassium from their diet. Good sources include bananas, sweet potatoes, avocados, spinach, beans, and yogurt. Rather than reaching for supplements, which can cause problems in people with kidney issues, focus on adding more potassium-rich foods to your meals.
Magnesium plays a supporting role in fluid balance too, and low magnesium levels can throw off both potassium and calcium regulation. Nuts, seeds, dark leafy greens, and whole grains are reliable sources.
One-Sided vs. Two-Sided Swelling
Pay attention to whether both ankles are swollen or just one. Swelling in both legs typically points to a systemic issue: too much sodium, medication side effects, prolonged sitting, or conditions affecting the heart, liver, or kidneys. This type of swelling usually develops gradually and responds well to the lifestyle strategies above.
Swelling in just one leg is a different situation. It can indicate a blood clot (deep vein thrombosis), an injury, infection, or lymphatic damage. Lymphedema, where the body’s drainage system is impaired, affects just one leg in about 75 percent of cases, with the left leg involved more often. One-sided swelling that comes on suddenly, is accompanied by pain, warmth, or redness, or doesn’t improve with elevation deserves prompt evaluation.
Putting It All Together
The most effective approach combines several strategies rather than relying on just one. A realistic daily routine might look like this: put on compression socks in the morning before your feet hit the floor, take short walking breaks every hour during the day, keep sodium under 2,000 mg, do ankle pumps when you’re stuck sitting, and elevate your legs for 15 minutes three or four times throughout the day. Most people with mild to moderate ankle swelling notice improvement within a few days of consistently following these steps. If your swelling doesn’t respond, worsens, or is accompanied by shortness of breath or chest pain, that points to something beyond lifestyle management.