Ankle swelling caused by fluid buildup, known as edema, typically responds well to a combination of elevation, compression, movement, and dietary changes. For most people, these strategies reduce swelling noticeably within a few days. Persistent or sudden swelling, especially in one leg, can signal something more serious that needs medical attention.
Why Fluid Pools in Your Ankles
Gravity works against you all day. When you sit or stand for long stretches, blood and fluid naturally settle into your lower legs. Your veins and lymphatic vessels are supposed to push that fluid back up toward your heart, but several things can overwhelm or weaken that system: heart failure, vein problems, kidney disease, liver disease, and certain medications.
For many people, the cause is simply prolonged inactivity. Jobs that keep you seated or standing in one position for hours are a common trigger, and the swelling is temporary. But when edema shows up regularly or gets worse over time, it often points to chronic venous insufficiency, where the valves in your leg veins don’t close properly, letting blood and fluid leak backward and pool around the ankles.
Elevate Your Legs the Right Way
Elevation is the simplest and most immediate way to move fluid out of your ankles. The key detail most people miss is height: your legs need to be 10 to 18 inches above your heart, not just propped on an ottoman at hip level. Lying on a couch or bed with pillows stacked under your calves works well. Aim for 15 to 20 minutes several times a day, especially after long periods of sitting or standing. You should notice your ankles looking and feeling less puffy within the first session, though the effect is temporary until you address the underlying cause.
Compression Stockings: Which Strength to Choose
Compression stockings apply graduated pressure to your lower legs, squeezing fluid upward toward your heart. They come in different pressure levels measured in millimeters of mercury (mmHg), and the right level depends on your situation.
For everyday swelling caused by sitting or standing at work, stockings in the 10 to 15 mmHg range are effective at preventing fluid buildup and reducing discomfort. Research shows that 15 to 20 mmHg stockings produce significant reductions in leg volume within just one day of use, and 20 to 30 mmHg stockings reduce swelling even further. If you spend most of your workday sitting, the higher pressure range (20 to 30 mmHg) tends to work better than it does for people who stand.
Knee-high stockings that reach the mid-calf are sufficient for ankle edema. Put them on first thing in the morning before swelling starts, and remove them at bedtime. If they feel too tight, cause numbness, or leave deep marks in your skin, try a lower pressure level or a different size.
Use Your Calf Muscles as a Pump
Your calf muscles act as a built-in pump for your veins. When they contract, they generate pressure of roughly 140 mmHg, forcefully squeezing blood out of the deep veins in your lower leg and pushing it upward toward your thigh and heart. When the muscles relax, the veins refill. This cycle is the primary way your body returns blood from your legs against gravity.
If you sit for most of the day, that pump barely activates. Simple movements fix this:
- Calf raises: Stand and rise onto your toes, hold for two seconds, lower back down. Repeat 15 to 20 times every hour.
- Ankle pumps: While seated, point your toes down, then pull them up toward your shin. Repeat 20 times. This engages the same calf muscles.
- Walking: Even a five-minute walk every hour activates the calf pump repeatedly and can prevent fluid from accumulating.
These exercises work best as prevention. If your ankles are already swollen, combine movement with elevation and compression for faster results.
Cut Back on Sodium
Sodium causes your body to hold onto water, and excess sodium makes edema worse. The average American consumes about 3,400 mg of sodium per day, well above the recommended limit of 2,300 mg. For people dealing with regular swelling, keeping sodium closer to 1,500 mg per day (about three-quarters of a teaspoon of salt) can make a meaningful difference in fluid retention.
Most dietary sodium doesn’t come from the salt shaker. It hides in processed foods, restaurant meals, canned soups, deli meats, bread, and condiments. Reading nutrition labels and cooking more meals at home are the most practical ways to get your intake down. You may not notice a dramatic change overnight, but within a week or two of lower sodium intake, many people find their baseline swelling improves.
Check Your Medications
Several common medications cause ankle swelling as a side effect. Blood pressure drugs called calcium channel blockers are among the most frequent culprits, particularly amlodipine, nifedipine, and felodipine. These medications relax blood vessels in a way that allows fluid to leak into surrounding tissue.
Other medications linked to edema include hormone therapies (estrogen, testosterone, corticosteroids), certain antidepressants, anti-inflammatory painkillers like ibuprofen and naproxen, and diabetes medications in the thiazolidinedione class. If your ankle swelling started or worsened after beginning a new medication, that connection is worth raising with your prescriber. Switching to a different drug in the same class sometimes resolves the problem.
When Ankle Swelling Needs Urgent Attention
Most ankle edema develops gradually in both legs and isn’t dangerous on its own. But certain patterns are red flags. Sudden, painful swelling in one leg, especially with skin discoloration or warmth, can indicate a deep vein thrombosis (a blood clot). This is a medical emergency because the clot can break loose and travel to your lungs.
Swelling accompanied by fever, spreading redness, and heat may signal cellulitis, a skin infection that can become serious without prompt treatment. And if your swelling comes with shortness of breath, chest pain, or difficulty breathing, that combination can point to heart failure or a pulmonary embolism, both of which require immediate care.
How Doctors Assess Edema Severity
When you see a provider about ankle swelling, they’ll likely press a finger firmly against your shin for about 20 seconds, then check whether the skin springs back or stays dented. This is called pitting edema, and it’s graded on a scale from 1+ to 4+ based on how deep the dent is. A 1+ pit is 2 to 4 millimeters deep and rebounds quickly. A 4+ pit is 8 millimeters or deeper and takes much longer to fill back in. The grade helps determine how aggressively the swelling needs to be treated and whether further testing is needed.
Depending on what the exam and your history suggest, your provider may order blood tests, an ultrasound of your leg veins, or heart imaging to identify the underlying cause. Treatment for persistent edema often includes prescription water pills (diuretics) that help your kidneys flush excess fluid. For swelling related to chronic vein problems, the 2025 clinical guidelines from the Society for Cardiovascular Angiography recommend a stepwise approach starting with compression therapy, potentially followed by procedures to close off damaged veins if compression alone isn’t enough.