Swollen ankles and feet usually improve with a few straightforward strategies: elevating your legs, moving more, cutting back on salt, and wearing compression socks. Most cases are caused by fluid pooling in the lower legs after long periods of sitting or standing, and the swelling resolves once you help that fluid drain. But persistent or sudden swelling, especially on one side, can signal something more serious that needs medical attention.
Elevate Your Legs Above Your Heart
The single fastest way to bring down swelling is to lie down and prop your legs up on pillows so your feet sit above the level of your heart. Gravity does the work, pulling trapped fluid back toward your core where your body can process it. Aim for 20 to 30 minutes at a time, and repeat several times a day if swelling is persistent. A recliner with a footrest can help, but lying flat with pillows stacked under your calves is more effective because it creates a steeper angle.
Use Compression Socks
Compression socks apply gentle, graduated pressure that keeps fluid from settling in your ankles and feet. They’re most effective when you put them on first thing in the morning, before swelling has a chance to build up.
For mild, everyday swelling from standing or sitting too long, socks in the 15 to 20 mmHg range work well and don’t require a prescription. If you’re dealing with moderate swelling or varicose veins, 20 to 30 mmHg provides firmer support. Anything above 30 mmHg is typically reserved for severe swelling or post-surgical recovery and should be fitted with guidance from a healthcare provider. Start with a lower pressure level if you’ve never worn compression socks before, and make sure they fit snugly without digging into your skin or bunching behind the knee.
Get Your Legs Moving
Your calf muscles act as a pump that pushes fluid upward through your veins and lymphatic vessels. When you sit or stand still for hours, that pump shuts off and fluid pools at your ankles. Even small movements restart it.
The simplest exercise is ankle pumps: pull your toes up toward your shin, then point them toward the floor. Repeat 5 to 10 times. You can do this at your desk, on a plane, or lying in bed. Ankle circles work the same way and also loosen stiff joints. Other effective movements include seated heel raises (keeping your toes on the floor while lifting your heels), seated leg raises (straightening one leg and pulling your toes toward the ceiling), and marching in place for up to a minute, either sitting or standing.
Walking is the best overall option if you’re able. Even a five-minute walk every hour makes a noticeable difference compared to sitting still. If mobility is limited, the seated exercises alone can meaningfully reduce swelling over the course of a day.
Cut Back on Sodium
Sodium causes your body to hold onto water, and that extra fluid often shows up as swelling in the lowest parts of your body. Most health guidelines for people prone to fluid retention recommend keeping sodium under 2,000 mg per day. For context, a single fast-food meal can contain 1,500 mg or more.
The biggest sources of hidden sodium are processed and packaged foods: canned soups, deli meats, frozen meals, bread, condiments, and restaurant dishes. Cooking at home with fresh ingredients gives you far more control. Read nutrition labels and look at the sodium per serving, not just per package. Swapping salty snacks for fruits and vegetables that are naturally high in potassium (bananas, sweet potatoes, spinach) also helps your kidneys flush excess fluid.
Consider Magnesium
Fluid retention can sometimes be linked to low magnesium levels. Taking 200 to 400 mg of magnesium daily may help reduce swelling, according to Cleveland Clinic podiatrist Georgeanne Botek. Magnesium is found in nuts, seeds, dark leafy greens, and dark chocolate, but a supplement can fill the gap if your diet falls short. Magnesium citrate and glycinate tend to absorb better than magnesium oxide.
Check Your Medications
Foot and ankle swelling is a common side effect of several widely prescribed drug classes. If your swelling started or worsened after beginning a new medication, that connection is worth exploring with your prescriber.
Blood pressure medications called calcium channel blockers are among the most frequent culprits, and the swelling tends to get worse at higher doses. Pain medications in the NSAID category (ibuprofen, naproxen) can cause fluid retention by affecting kidney function. Nerve pain medications like gabapentin and pregabalin produce swelling through a similar mechanism. Steroids, insulin, certain diabetes medications, and some antipsychotics can also contribute. Never stop a prescribed medication on your own, but knowing that drug-induced swelling exists can help you have a more productive conversation with your doctor about alternatives.
When Swelling Is a Warning Sign
Most ankle swelling is harmless, but certain patterns point to conditions that need prompt evaluation.
Swelling in One Leg Only
When only one ankle or leg swells, the concern is a blood clot in a deep vein. This is especially likely if the swelling came on suddenly and is accompanied by warmth, redness, or a deep aching pain in the calf. Other causes of one-sided swelling include muscle injuries (the most common, accounting for about 40% of cases), infections, and cysts behind the knee. A blood clot requires urgent treatment, so sudden one-sided swelling shouldn’t be waited out.
Swelling in Both Legs
Bilateral swelling that develops gradually is most often caused by chronic vein problems, prolonged sitting or standing, or medication side effects. But when both legs swell suddenly, heart failure is a common cause, particularly if you also notice shortness of breath, fatigue, or difficulty lying flat without feeling breathless. Kidney disease, liver disease, severe thyroid problems, and sleep apnea can also cause persistent swelling in both legs.
Swelling During Pregnancy
Some ankle swelling is normal in pregnancy, especially in the third trimester. However, sudden or severe swelling in the face, hands, or feet can be a sign of preeclampsia, a serious blood pressure condition. If swelling comes with headaches, vision changes, or upper abdominal pain, that warrants immediate evaluation.
Symptoms That Need Emergency Care
Call emergency services if swelling in your legs is accompanied by sudden difficulty breathing, chest pain or tightness, or coughing up blood. These can indicate a blood clot has traveled to the lungs, which is life-threatening and requires immediate treatment.
Daily Habits That Prevent Swelling
If you’re prone to puffy ankles by the end of the day, a few habit changes can keep swelling from building up in the first place. Avoid sitting or standing in one position for more than an hour. Set a timer if you need to. When seated, uncross your legs and keep your feet flat on the floor, or place them on a low footstool. Wear shoes that aren’t too tight, especially if your feet tend to swell as the day goes on. Stay well hydrated, because dehydration actually makes your body retain more fluid, not less. And if compression socks help, make them part of your morning routine on days when you know you’ll be on your feet or traveling.