Swollen ankles usually improve with a few straightforward steps: elevating your legs, moving around, cutting back on salt, and wearing compression socks. Most cases are caused by fluid pooling in your lower legs after sitting or standing too long, and the fix is largely mechanical. But ankle swelling can also signal something more serious, so knowing when to act on your own and when to get medical attention matters.
Why Ankles Swell in the First Place
Tiny blood vessels called capillaries leak small amounts of fluid into surrounding tissue all the time. Normally your body reabsorbs that fluid efficiently. Swelling happens when the leak outpaces the drainage, and fluid builds up faster than your body can clear it. Gravity pulls that excess fluid downward, which is why your ankles and feet take the hit first.
The most common triggers are everyday and reversible: sitting at a desk all day, standing for hours at work, flying on a long flight, eating a salty meal, or being pregnant. Certain medications are frequent culprits too. A class of blood pressure drugs called calcium channel blockers causes ankle swelling in 1 to 15 percent of people taking standard doses, and that number can climb above 80 percent at higher doses. If your ankles started swelling after a new prescription, that connection is worth raising with your provider.
More serious causes include heart failure (where the heart can’t pump blood forward efficiently, so it backs up into the legs), kidney disease, liver disease, thyroid problems, and chronic venous insufficiency, where damaged valves in leg veins let blood pool instead of returning to the heart. These conditions typically cause swelling in both legs. Swelling in just one leg raises a different concern, particularly a blood clot.
Simple Steps That Reduce Swelling
Elevate Your Legs
The simplest and most effective thing you can do is get your feet above the level of your heart. Lie on a couch and prop your legs on a couple of pillows, or lie on the floor with your legs resting up against a wall. This lets gravity work in your favor, draining fluid back toward your core. Even 15 to 20 minutes a few times a day helps noticeably. If you tend to swell overnight, a pillow under your ankles while sleeping can make a difference by morning.
Move Your Ankles and Calves
Your calf muscles act as a pump for your veins, squeezing blood upward with every contraction. When you sit still for hours, that pump shuts off and fluid accumulates. Ankle pumps are the easiest fix: point your toes toward your knees, then away from you, alternating back and forth for two to three minutes. Repeat this two to three times per hour when you’re sitting for long stretches. Walking, even briefly, activates the same calf pump more forcefully. If you work at a desk, setting a timer to stand and walk for a few minutes every hour can prevent swelling from building up in the first place.
Cut Back on Sodium
Salt makes your body hold onto water, which worsens swelling. The general recommendation for people dealing with edema is to keep daily sodium intake between roughly 1,400 and 1,800 milligrams. For context, one teaspoon of table salt contains about 2,300 milligrams, and a single fast-food meal can easily exceed 1,500. Reading nutrition labels, cooking at home more often, and swapping processed foods for fresh ones are the most practical ways to get sodium down. The results aren’t instant, but within a few days of lower salt intake, most people notice less puffiness.
Try Compression Socks
Compression stockings apply graduated pressure to your lower legs, helping push fluid back up toward your heart. Low-compression options (under 20 mmHg) are available over the counter and work well for mild swelling from prolonged sitting, standing, or pregnancy. Stockings rated 20 mmHg or higher typically require a prescription and are used for more persistent swelling or venous insufficiency. Put them on in the morning before swelling has a chance to build, since they’re much harder to pull on over already-swollen ankles. Some people experience skin irritation or discomfort, so start with shorter wear times and make sure you have the right size.
One Leg vs. Both Legs
Pay attention to whether the swelling is in one ankle or both, because the distinction points to very different causes. Swelling in both legs is more commonly linked to systemic conditions: heart failure, kidney problems, liver disease, medication side effects, or simply too much time on your feet. These tend to develop gradually and worsen over the course of the day.
Swelling in just one leg, especially if it comes on suddenly and is accompanied by pain, warmth, or redness in the calf, raises concern for a deep vein thrombosis (DVT), a blood clot in a leg vein. This is not something to monitor at home. A clot can break loose and travel to the lungs, causing a pulmonary embolism. Warning signs of that include sudden shortness of breath, chest pain that worsens when you breathe deeply or cough, a rapid pulse, dizziness, or coughing up blood. Any of those symptoms warrant an emergency room visit.
How to Tell If Swelling Is Mild or Serious
You can get a rough sense of severity with a simple test. Press your thumb firmly into the swollen area for about five seconds, then release. If the skin bounces back immediately and leaves only a shallow indent (about 2 millimeters), that’s grade 1 pitting edema, the mildest form. If the dent is deeper (3 to 4 millimeters) and takes up to 15 seconds to fill back in, that’s grade 2. Grade 3 leaves a 5 to 6 millimeter pit that takes up to a minute to rebound, and grade 4 creates an 8 millimeter pit that lingers for two to three minutes.
Grade 1 swelling that shows up after a long day and resolves overnight is usually nothing to worry about. Swelling that doesn’t go away with elevation, gets progressively worse over days or weeks, or sits at grade 3 or 4 warrants a medical evaluation. The same applies if you notice swelling alongside unexplained weight gain, shortness of breath, or reduced urine output, all of which can point to heart, kidney, or liver involvement.
Lifestyle Changes That Help Long-Term
If swollen ankles are a recurring problem rather than a one-time event, a few sustained changes make a real difference. Maintaining a healthy weight reduces pressure on your veins and improves circulation. The 2025 clinical guidelines for chronic venous disease specifically emphasize weight loss and regular exercise as foundational to managing the condition, even for people who eventually need more advanced treatment.
Regular walking or swimming keeps your calf muscles active and your venous system healthy. Avoid crossing your legs for long periods, which compresses veins and slows return blood flow. If your job requires standing all day, compression socks worn during shifts can prevent swelling rather than just treating it after the fact. And if you’re on a medication known to cause swelling, particularly calcium channel blockers, blood pressure drugs in other classes, or certain diabetes medications, a conversation with your prescriber about alternatives may solve the problem entirely.
Drinking enough water seems counterintuitive when your body is already holding onto fluid, but dehydration actually triggers your body to retain more. Staying well-hydrated helps your kidneys flush excess sodium and keeps fluid balance in check.
What a Doctor Visit Looks Like
If home measures aren’t working, your provider will likely start with a physical exam and some blood work to check your heart, kidney, liver, and thyroid function. They may order an ultrasound of your legs to look for blood clots or valve problems in your veins. For chronic venous insufficiency, where damaged vein valves let blood pool in the legs, treatment ranges from consistent compression therapy to minimally invasive procedures that close off faulty veins. In cases related to heart or kidney disease, the underlying condition drives the treatment plan, often including medications that help your body release excess fluid.