Swollen ankles usually respond well to a combination of elevation, movement, compression, and dietary changes. Most cases stem from fluid pooling in your lower legs due to gravity, prolonged sitting or standing, excess salt intake, or medication side effects. The strategies below work for everyday fluid retention, but sudden swelling in one leg, especially with pain or warmth, needs immediate medical attention.
Elevate Your Legs Above Your Heart
The fastest way to move fluid out of swollen ankles is gravity. Lie down and prop your feet on pillows so your ankles sit higher than your chest. This lets pooled fluid drain back toward your core through your veins and lymphatic system. Aim for 20 to 30 minutes at a time, several times a day if the swelling is persistent. Even a modest elevation, like resting your feet on an ottoman while sitting, helps more than keeping them flat on the floor.
Use Calf and Ankle Exercises
Your calf muscles act as a pump that pushes blood back up toward your heart. When you sit or stand still for hours, that pump barely works, and fluid accumulates around your ankles. Simple movements reactivate it. Ankle pumps (pointing your toes down, then pulling them up toward your shin) are the easiest to do anywhere, including at a desk or on a plane. Heel raises, where you stand and lift onto your toes then lower back down, are another effective option. Alternating between heel raises and toe raises while standing engages both the front and back of your lower leg.
A structured routine used in vein therapy programs includes static calf stretches, resistance band exercises for the ankle, heel and toe raises on both feet, and mini-squats. You don’t need to follow that exact protocol. The key principle is to flex and extend your ankle and contract your calf repeatedly throughout the day, especially during long periods of sitting.
Try Compression Socks or Stockings
Compression garments apply graduated pressure, tightest at the ankle and looser up the calf, to prevent fluid from settling downward. They come in different pressure levels measured in millimeters of mercury (mmHg):
- 15 to 20 mmHg (mild): Best for very early or mild swelling and for everyday prevention if you’re on your feet all day or traveling.
- 20 to 30 mmHg (moderate): Appropriate for mild to moderate lower-leg swelling that doesn’t resolve with lighter compression alone.
- 30 to 40 mmHg (firm): Typically reserved for more significant venous problems and usually requires a fitting or prescription.
For most people dealing with occasional puffy ankles, the 15 to 20 mmHg range is a good starting point. Put them on in the morning before swelling builds, since they’re designed to prevent fluid accumulation rather than squeeze it out after the fact. If your ankles are already swollen, elevate first, then slide the stockings on.
Cut Back on Sodium
Salt makes your body hold onto water, and that extra fluid tends to settle in your feet and ankles. Keeping sodium intake under 2,000 mg per day is the threshold that clinical guidelines use for managing fluid retention. For context, a single fast-food meal can easily contain 1,500 mg or more. Canned soups, deli meats, frozen meals, soy sauce, and restaurant food are the biggest sources for most people.
Reading nutrition labels is the most practical step here. Look for sodium per serving, not per container, and choose products with less than 300 to 400 mg per serving when you can. Cooking at home with fresh ingredients gives you the most control. The reduction in swelling from lowering your salt intake can be noticeable within a few days.
Rethink Fluid Intake
It sounds counterintuitive, but drinking more water doesn’t always help with swelling. Harvard Health notes that treatment for edema sometimes involves avoiding excessive fluid intake alongside reducing salt. If your swelling is related to heart, kidney, or liver conditions, drinking large amounts of water can actually make things worse. Practical guidelines for people with heart-related fluid retention suggest limiting fluids to about 50 ounces per day.
For otherwise healthy people with mild ankle swelling, staying normally hydrated is fine. The goal is to avoid the extremes: neither dehydrating yourself nor flooding your system with fluids your body can’t process efficiently.
Check Your Medications
Several common medications cause ankle swelling as a side effect. Blood pressure drugs in the calcium channel blocker family are among the most frequent culprits. They work by relaxing blood vessels, but this relaxation can let extra fluid leak into surrounding tissues, particularly around the ankles. Other medications linked to swelling include certain diabetes drugs, anti-inflammatory painkillers like ibuprofen and naproxen, steroids, some antipsychotics, insulin, and certain drugs used for nerve pain.
If your ankle swelling started or worsened after beginning a new medication, that connection is worth raising with your prescriber. There are often alternative drugs in the same class that cause less fluid retention. Don’t stop a prescribed medication on your own, but do flag the timing if it lines up.
Magnesium May Help as a Supplement
There’s limited but encouraging evidence that magnesium supplements can reduce swelling in people with vein-related fluid retention. In one clinical study, patients who added 365 mg of magnesium oxide at bedtime to their existing vein treatment saw significantly greater improvements in edema scores over two weeks compared to those who didn’t take magnesium. The effect was modest, and the supplement was used alongside other treatments rather than alone.
Magnesium is generally safe at supplemental doses up to 350 to 400 mg daily for most adults, though it can cause loose stools at higher amounts. It’s worth trying if your swelling is a recurring issue, but it’s not a substitute for the basics of elevation, movement, and sodium reduction.
How to Tell If Swelling Is Serious
Most ankle swelling is harmless and related to lifestyle factors. But certain patterns signal something more urgent. Swelling in only one leg, particularly when accompanied by pain or cramping in the calf, skin that looks red or purple, or warmth in the affected leg, can indicate a deep vein thrombosis (blood clot). A DVT can also occur without obvious symptoms, which is why sudden, unexplained one-sided swelling deserves prompt evaluation.
You can do a simple self-check by pressing a finger firmly into the swollen area for about 10 seconds. If your finger leaves a visible dent that takes time to fill back in, that’s called pitting edema. Mild pitting, where the dent is about 2 mm and rebounds immediately, is common and usually not worrying. Deeper pits of 5 mm or more that take 15 seconds to a few minutes to rebound suggest more significant fluid retention that warrants medical evaluation, especially if it’s new or getting worse over days.
If you ever develop sudden shortness of breath, chest pain that worsens with breathing, a rapid pulse, dizziness, or coughing up blood alongside leg swelling, those are signs of a pulmonary embolism and require emergency care.