Swollen ankles usually improve with a combination of elevation, movement, compression, and dietary changes. Most mild swelling from prolonged sitting or standing responds to these measures within a few hours, though persistent or recurring swelling may take days of consistent effort to manage. The key is understanding what’s driving the fluid buildup, because the best approach depends on the cause.
Why Ankles Swell in the First Place
Your body constantly moves fluid between your blood vessels and the tissue surrounding them. Swelling happens when fluid leaks out of tiny blood vessels (capillaries) faster than your lymphatic system can drain it back. Gravity pulls that excess fluid downward, which is why ankles and feet bear the brunt of it.
Several things tip this balance. Sitting or standing for long periods raises pressure in the veins of your lower legs, pushing more fluid into surrounding tissue. High sodium intake causes your body to hold onto water. Heart or kidney problems can disrupt fluid balance on a larger scale. And certain medications, particularly blood pressure drugs called calcium channel blockers, cause swelling not by retaining extra fluid but by redistributing it from capillaries into surrounding tissue. At higher doses, these medications cause ankle swelling in more than 80% of long-term users.
Elevate Your Legs Above Heart Level
Elevation is the simplest and fastest way to move fluid out of your ankles. Lie down and prop your legs up so your feet sit higher than your chest. This reverses the gravitational pull that pools fluid in your lower legs. You don’t need a dramatic height difference. Research on post-surgical ankle swelling found that even resting your leg on a standard pillow (about 10 centimeters of elevation) produced satisfactory swelling reduction, though higher elevation with a cushion wedge worked slightly better.
Try to elevate for 15 to 20 minutes at a time, several times a day. If your swelling is significant, longer sessions help more. During the first 24 to 48 hours of noticeable swelling, prioritize rest and elevation as much as possible.
Use Ankle Pumps to Drive Circulation
Your calf muscles act as a pump for the veins in your lower legs. Every time they contract, they squeeze blood upward toward your heart. When you sit still for hours, that pump goes idle, and fluid accumulates.
Ankle pumps are a simple exercise you can do anywhere. Sit or lie with your legs extended, then alternate between pointing your toes toward your knees and pointing them away from you, moving through the full range each direction. Do this for two to three minutes at a time, and repeat two to three times per hour when you’re sitting for extended periods. Walking is even more effective since it engages the full calf muscle, but ankle pumps work well when you’re stuck at a desk or on a long flight.
Try Compression Stockings
Compression stockings apply graduated pressure to your lower legs, with the tightest squeeze at the ankle and decreasing pressure up toward the knee. This counteracts the tendency for fluid to pool at the lowest point.
Compression is measured in millimeters of mercury (mmHg), and stockings come in four classes:
- Class I (18 to 21 mmHg): mild compression for occasional swelling, tired legs, or prevention during travel
- Class II (23 to 32 mmHg): moderate compression for recurring edema or varicose veins
- Class III (34 to 46 mmHg): firm compression for more severe or chronic swelling
- Class IV (49+ mmHg): very firm compression, typically prescribed for lymphatic conditions
For general swelling from prolonged sitting or standing, Class I stockings are a good starting point and are available without a prescription. If your swelling is more persistent, Class II stockings offer meaningful improvement but are best fitted with guidance, since stockings that are too tight or the wrong length can make things worse. Put them on in the morning before swelling builds up during the day.
Cut Back on Sodium
Sodium causes your body to retain water, and most people eat far more than they need. The American Heart Association recommends staying under 1,500 mg of sodium per day. For context, a single fast-food meal can easily exceed that amount.
The biggest sources of hidden sodium aren’t the salt shaker on your table. They’re processed foods, canned soups, deli meats, sauces, and restaurant meals. Reading nutrition labels helps, but the most effective strategy is cooking more meals from whole ingredients. If you currently eat a high-sodium diet, cutting back often produces a noticeable difference in fluid retention within a few days as your body releases the extra water it was holding.
Stay Hydrated and Check Your Magnesium
It sounds counterintuitive, but drinking enough water actually reduces fluid retention. A well-hydrated body is less likely to hold onto excess fluid because it isn’t getting signals to conserve water. Dehydration triggers your kidneys to retain sodium and water, which can worsen swelling.
Magnesium deficiency can also contribute to water retention. If your diet is low in magnesium-rich foods like nuts, seeds, leafy greens, and dark chocolate, that gap may be part of the problem. Cleveland Clinic’s Dr. Georgeanne Botek notes that 200 to 400 mg of supplemental magnesium per day may help reduce swelling, though people with kidney or heart conditions should check with their doctor before supplementing.
Check Your Medications
If your ankle swelling started or worsened after beginning a new medication, the drug itself may be responsible. Calcium channel blockers, commonly prescribed for high blood pressure, are the most frequent culprits. These include amlodipine, nifedipine, felodipine, diltiazem, and verapamil, among others. The swelling is dose-related: at low doses, it affects 1 to 15% of users, but at higher doses taken long-term, incidence climbs dramatically.
Other medication categories that can cause ankle swelling include certain diabetes drugs, anti-inflammatory painkillers, and some hormonal therapies. Don’t stop any prescribed medication on your own, but if you suspect a connection, bring it up with your prescriber. Dose adjustments or switching to an alternative often resolves the issue.
Apply Cold Therapy for Acute Swelling
If your swelling is from an injury like a sprain or strain, cold therapy helps in the first 48 hours. Immerse your foot and ankle in cold water, or wrap an ice pack in a towel and apply it for 15 to 20 minutes, three times a day. The cold constricts blood vessels and slows the inflammatory process that drives acute swelling. After the first couple of days, the focus shifts to gentle movement and gradual return to activity.
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 accompanied by pain, warmth, tenderness, or skin that looks red or purple, can indicate a deep vein thrombosis (a blood clot in the leg veins). DVT can sometimes occur without obvious symptoms, which makes one-sided swelling worth taking seriously even if it doesn’t hurt much.
Seek emergency care if you experience sudden shortness of breath, chest pain that worsens with deep breaths, a rapid pulse, dizziness, or coughing up blood. These are signs that a blood clot may have traveled to the lungs. Swelling in both legs that develops gradually and doesn’t improve with elevation can point to heart, kidney, or liver issues that need medical evaluation, particularly if you also notice swelling in your hands or face, or if you’re gaining weight rapidly without changes in diet.