Swollen feet usually improve with a few simple strategies: elevating your legs, cutting back on salt, moving around more, and wearing compression socks. Most foot swelling comes from fluid pooling in your tissues after long periods of sitting or standing, and the fix is helping that fluid drain back toward your heart. But swelling can also signal something more serious, so knowing what’s behind it matters just as much as knowing how to treat it.
Why Your Feet Are Swelling
Foot swelling happens when fluid leaks out of your blood vessels and collects in the surrounding tissue. Gravity pulls that fluid downward throughout the day, which is why your feet and ankles take the brunt of it. The most common everyday triggers are standing or sitting for hours, eating salty food, and hot weather.
Beyond those temporary causes, several medical conditions can make swelling persistent. Heart failure weakens the heart’s pumping ability, causing blood to back up into the legs, ankles, and feet. Venous insufficiency, where the valves in your leg veins stop working properly, is another frequent cause. Kidney disease and liver disease both disrupt your body’s fluid balance in ways that show up as swelling. Certain medications are also known culprits, particularly blood pressure drugs called calcium channel blockers (like amlodipine) and some diabetes medications. If your swelling started around the same time as a new prescription, that connection is worth exploring with your doctor.
Elevate Your Legs
Getting your feet above heart level lets gravity work in your favor, pulling trapped fluid back into circulation. Lie down and prop your legs on a couple of pillows. Research comparing different elevation heights found that even low elevation with a standard pillow produced satisfying swelling reduction, so you don’t need an elaborate setup. The key is doing it consistently: aim for 20 to 30 minutes at a time, several times a day if your swelling is noticeable.
If you work at a desk, even putting your feet up on a stool or chair during the day helps slow the fluid buildup, though lying down with your legs raised is more effective.
Move Your Feet and Legs
Your calf muscles act as a pump for your veins. Every time they contract, they squeeze blood upward toward your heart. When you sit or stand still for hours, that pump goes idle and fluid accumulates.
Ankle pumps are one of the simplest exercises to get things moving. Sit or lie with your legs extended, then alternate between pointing your toes toward your knees and pointing them away from you, going as far as you comfortably can in each direction. Do this for two to three minutes, and repeat two to three times per hour when you’re sedentary. Walking is even better. A short walk every hour or two keeps the calf pump active and prevents fluid from settling into your feet. If walking isn’t an option, even flexing and circling your ankles at your desk makes a difference.
Cut Back on Salt
Sodium makes your body hold onto water. The more salt you eat, the more fluid your kidneys retain, and the more likely that fluid is to end up pooled in your feet. Your body works hard to keep sodium and water in balance: when sodium levels rise, your kidneys hold onto water to dilute it, increasing your overall fluid volume.
The American Heart Association recommends staying under 1,500 mg of sodium per day. For context, a single fast-food meal can easily contain 1,200 to 1,800 mg. The biggest sources of sodium aren’t the salt shaker on your table. They’re processed and packaged foods: canned soups, deli meats, frozen meals, bread, and restaurant dishes. Reading nutrition labels and cooking more at home are the two most effective ways to bring your intake down. Most people eating a typical Western diet consume 3,400 mg or more per day, so even a modest reduction can make a noticeable difference in swelling.
Stay Hydrated
It sounds counterintuitive, but drinking enough water actually helps reduce swelling rather than making it worse. When you’re dehydrated, your body responds by holding onto whatever fluid it has, including in your tissues. Staying well-hydrated signals your kidneys to release excess water and sodium through urine, keeping your fluid balance in check. Your pituitary gland regulates this process: when you have adequate water, it dials back the hormone that tells your kidneys to conserve fluid, so you naturally flush out more.
There’s no need to force excessive amounts. For most adults, six to eight glasses a day is a reasonable target. If you’re pregnant, the recommendation is about 10 cups (2.3 liters) daily, and cutting back on fluids won’t help pregnancy-related swelling.
Try Compression Socks
Compression stockings apply graduated pressure to your legs, tightest at the ankle and loosening as they go up. This helps push fluid back into your veins and prevents it from leaking into surrounding tissue.
Over-the-counter options come in a range of pressure levels measured in mmHg:
- 15 to 20 mmHg (mild): Good for minor daily swelling, long flights, or standing all day at work. These are widely available at pharmacies without a prescription.
- 20 to 30 mmHg (moderate): The most commonly prescribed level for persistent mild to moderate swelling and venous insufficiency. Some stores carry these, though a prescription is sometimes needed.
- 30 to 40 mmHg (firm): Used for more significant swelling or diagnosed vein problems. These typically require a clinical assessment and fitting.
If you’ve never worn compression socks before, start with the 15 to 20 mmHg range. Put them on first thing in the morning before swelling has a chance to build, and wear them throughout the day. They should feel snug but not painful. Avoid styles with tight bands at the top of the calf, which can actually restrict blood flow and make things worse.
Swelling During Pregnancy
Some degree of foot and ankle swelling is normal during pregnancy, especially in the third trimester. Your body retains more fluid and your growing uterus puts pressure on the veins returning blood from your legs. A few strategies help:
- Avoid standing for long stretches. When sitting, prop your feet up and rotate your ankles in circles to keep blood moving.
- Raise your legs slightly with pillows while sleeping.
- Stand or walk in a pool. The water pressure gently compresses your legs and can noticeably reduce swelling.
- Skip tight clothing around your ankles or calves, which can restrict circulation.
- Don’t cut back on water. Staying hydrated during pregnancy is important for both you and the baby, and restricting fluids won’t reduce swelling.
Sudden or severe swelling during pregnancy is a different situation. Rapid swelling in one leg could indicate a blood clot. Sudden swelling in your face or hands, especially alongside rising blood pressure, can be a sign of preeclampsia. Contact your healthcare team right away if swelling comes on quickly or is painful.
Warning Signs That Need Attention
Most foot swelling is harmless and temporary. But certain patterns are red flags. Swelling in only one leg, especially with pain, warmth, or a color change in the skin (red or purplish), can signal a deep vein thrombosis, which is a blood clot in one of your deep leg veins. This requires prompt medical evaluation because the clot can break loose and travel to the lungs.
Seek emergency care if you develop sudden shortness of breath, chest pain that worsens when you breathe or cough, a rapid pulse, dizziness, or you cough up blood. These are signs of a pulmonary embolism, which is a clot that has reached the lungs.
Swelling that doesn’t improve with elevation and salt reduction, gets progressively worse over weeks, or comes with unexplained weight gain and fatigue could point to heart, kidney, or liver problems. Persistent swelling that leaves an indent when you press on it (called pitting edema) is worth bringing up with your doctor, particularly if it’s new or worsening.