If your feet are swollen, the first thing to do is elevate them above the level of your heart, reduce your salt intake, and move around if you’ve been sitting for a long time. These three steps resolve most cases of mild, temporary swelling. But foot swelling can also signal something more serious, so knowing what’s causing it matters just as much as treating it.
Elevate, Move, and Reduce Salt
The single most effective thing you can do right now is lie down and prop your feet up so they’re above chest level. Use pillows, a stack of blankets, or the arm of a couch. This lets gravity pull fluid back toward your core instead of letting it pool in your lower legs. Stay in this position for 20 to 30 minutes and repeat several times a day if swelling persists.
If you’ve been sitting or standing in one position for hours, get up and walk. Even a short walk engages your calf muscles, which act as pumps that push fluid back up through your veins. Flexing and pointing your feet repeatedly can help if you’re stuck in a seat.
Salt plays a direct role in fluid retention. For people dealing with persistent swelling, keeping daily sodium intake between 1,375 and 1,800 mg is a common target. That’s well below what most people eat. Processed foods, restaurant meals, canned soups, and deli meats are the biggest sources. Reading nutrition labels and cooking at home gives you the most control. Drinking more water may sound counterintuitive, but staying hydrated actually helps your kidneys flush excess sodium rather than holding onto fluid.
Compression Socks Can Help
Compression socks apply gentle, graduated pressure to your lower legs, preventing fluid from settling into your feet and ankles. For mild swelling (the kind you get after a long day on your feet, a flight, or sitting at a desk), over-the-counter socks rated at 15 to 20 mmHg are effective and don’t require a prescription.
If your swelling is more persistent, leaves a visible dent when you press on it, or doesn’t fully go away overnight, a 20 to 30 mmHg compression level is typically the next step. These are best chosen with a doctor’s input to make sure the fit and pressure are right for you. Put compression socks on first thing in the morning before swelling builds up during the day.
Why Your Feet Are Swelling
Understanding the cause helps you decide whether home care is enough or something else is going on. The most common, least worrisome triggers are lifestyle-related: sitting or standing too long, eating salty food, being premenstrual, or being pregnant. These cause temporary, mild swelling in both feet that improves with the steps above.
Several categories of medication also cause foot swelling as a side effect. Blood pressure medications (particularly a class called calcium channel blockers), anti-inflammatory painkillers like ibuprofen, steroids, estrogen-based hormones, certain diabetes drugs, and some nerve pain medications can all cause fluid to accumulate in your lower legs. If your swelling started or worsened around the time you began a new prescription, that connection is worth discussing with your prescriber. Don’t stop taking a medication on your own, but know that switching to an alternative often resolves the problem.
More serious medical causes include heart failure, kidney disease, liver disease, and chronic venous insufficiency (where the valves in your leg veins weaken and stop pushing blood upward efficiently). Heart failure causes blood to back up in the legs because the heart isn’t pumping effectively. Kidney disease leads to a buildup of fluid and salt that the kidneys can’t clear. Liver damage from cirrhosis causes fluid to pool in the abdomen and legs. These conditions produce swelling that tends to be ongoing and progressive rather than coming and going.
Swelling in One Foot Is Different
When only one foot or leg swells, the possible causes shift. A blood clot in a deep leg vein, known as DVT, typically affects one leg and comes with pain or cramping that often starts in the calf, warmth in the affected area, and skin that turns red or purple. This is not something to manage at home. A clot can break loose and travel to the lungs, which is a life-threatening emergency.
Damage to the lymphatic system, sometimes from surgery or cancer treatment, can also cause swelling in one leg. An injury like a sprain or fracture is another obvious cause of one-sided swelling. The key distinction: symmetric swelling in both feet is more commonly a fluid-balance issue, while asymmetric swelling in one leg needs prompt evaluation.
When Swollen Feet Need Emergency Care
Call emergency services immediately if your swollen feet are accompanied by shortness of breath, chest tightness or pain, coughing up blood, a racing or pounding heartbeat, or feeling lightheaded, faint, or confused. These symptoms together can indicate a blood clot in the lungs or acute heart failure, both of which require hospital treatment right away.
Outside of emergencies, you should still see a doctor relatively soon if your swelling doesn’t improve after a few days of home care, if pressing your skin leaves a dent that takes several seconds to fill back in (called pitting edema), if swelling is getting progressively worse, or if only one leg is affected with pain and warmth.
Pregnancy Swelling vs. Preeclampsia
Swollen feet are extremely common during pregnancy, especially in the third trimester, and are usually harmless. Your body retains more fluid, your growing uterus puts pressure on pelvic veins, and gravity does the rest. Elevating your feet, wearing supportive shoes, and staying active all help.
The warning sign to watch for is sudden swelling, particularly in your face and hands, or rapid, unexplained weight gain. These can be signs of preeclampsia, a pregnancy complication involving high blood pressure that can become dangerous for both mother and baby. Gradual ankle puffiness that builds through the day is normal. Waking up with a noticeably swollen face or hands that weren’t swollen the day before is not.
What to Expect at the Doctor
If you go in for persistent swelling, your doctor will start with a physical exam, pressing on the swollen area and asking about your medical history, medications, and when the swelling started. In many cases, this is enough to identify the cause. If not, they may order blood tests to check kidney and liver function, an ultrasound to look for blood clots or vein problems, or other imaging depending on what they suspect. Treatment depends entirely on the underlying cause: adjusting a medication, prescribing compression therapy, managing a heart or kidney condition, or in the case of DVT, blood-thinning medication to dissolve the clot.