Swollen feet result from excess fluid trapped in the tissues, and while there’s no single “cure,” most cases respond well to a combination of elevation, movement, compression, and dietary changes. The right approach depends on what’s causing the swelling in the first place. Fluid pools in your feet and ankles because gravity pulls it downward, and anything that disrupts the normal balance of pressure inside your blood vessels, from too much sodium to sitting still for hours, can make it worse.
Why Feet Swell in the First Place
Your body constantly moves fluid between your bloodstream and surrounding tissues. Swelling happens when that exchange tips out of balance. The most common triggers include increased pressure inside your veins (from standing, sitting, or carrying extra weight), eating too much salt, hormonal shifts during pregnancy or menstruation, and side effects from certain medications. Heart, kidney, or liver problems can also cause fluid buildup, though these tend to produce swelling that’s persistent and gets worse over time rather than coming and going.
You can get a rough sense of severity with a simple press test. Push your thumb into the swollen area for a few seconds and release. If the indent bounces back immediately and is barely visible, that’s mild. If it leaves a deep pit (5 mm or more) that takes 15 seconds to a full minute to refill, the swelling is moderate to severe and worth bringing up with a doctor.
Elevate Your Legs Above Your Heart
Elevation is the simplest and most effective first step. Lie down and prop your legs on pillows so your feet sit above the level of your heart. This reverses the gravitational pull that trapped the fluid there in the first place. Aim for about 15 minutes per session, three to four times a day. Even short sessions help, but consistency matters more than duration. If you can only manage it once or twice a day, do it in the evening when swelling tends to peak.
Move Your Feet and Calves Regularly
Your calf muscles act as a pump for the veins in your lower legs. Every time you flex your ankle or rise onto your toes, those muscles squeeze blood and fluid upward toward your heart. When you sit or stand still for long stretches, that pump stalls and fluid accumulates.
A few targeted movements can restart it:
- Ankle pumps: While sitting, point your toes down, then pull them up toward your shin. Repeat 15 to 20 times.
- Heel and toe raises: Stand and slowly rise onto your toes, then lower back down. Alternate with lifting your toes while keeping your heels on the ground.
- Mini-squats: Shallow knee bends engage the entire calf and thigh, giving the venous pump a stronger squeeze.
If you work at a desk, set a reminder to do ankle pumps every 30 minutes. On long flights or car rides, these small movements can prevent swelling from developing at all.
Try Compression Socks
Compression socks apply graduated pressure, tightest at the ankle and looser toward the knee, to help push fluid back into circulation. They come in different pressure levels measured in millimeters of mercury (mmHg):
- 15 to 20 mmHg (mild): Good for minor, occasional swelling, long flights, or all-day standing. Available without a prescription.
- 20 to 30 mmHg (moderate): The most commonly prescribed level for recurring lower-leg swelling.
- 30 to 40 mmHg (firm): Used for more significant or stubborn swelling, often when lighter levels haven’t been enough.
Put them on first thing in the morning before swelling builds up. If you put them on over already-swollen feet, they’ll be harder to get on and less effective. For mild everyday puffiness, over-the-counter options in the 15 to 20 mmHg range are a reasonable starting point.
Cut Back on Sodium
Sodium causes your body to hold onto water. The more salt you eat, the more fluid your kidneys retain, and some of that extra fluid ends up in your tissues. Most health organizations recommend staying under 2,000 mg of sodium per day if you’re dealing with fluid retention. The American Heart Association suggests an even lower target of 1,500 mg daily for optimal heart health.
The biggest sodium sources aren’t the salt shaker. Processed foods, restaurant meals, canned soups, deli meats, and condiments like soy sauce account for the majority of sodium in most diets. Reading nutrition labels and cooking more meals at home are the two changes that make the biggest difference. Potassium-rich foods like bananas, sweet potatoes, and leafy greens help your kidneys excrete sodium more efficiently, which can further reduce fluid retention.
Stay Hydrated
It sounds counterintuitive, but drinking enough water actually helps reduce swelling. When you’re dehydrated, your body compensates by holding onto whatever fluid it has, and higher sodium concentrations in your blood make the retention worse. Staying well-hydrated keeps sodium levels diluted and signals your kidneys to release excess fluid rather than hoard it. There’s no magic number that works for everyone, but pale yellow urine is a reliable sign you’re drinking enough.
Medications That Cause Swelling
Several common medications list foot and ankle swelling as a side effect. Blood pressure drugs, particularly calcium channel blockers like amlodipine and nifedipine, are among the most frequent culprits. Steroids like prednisone cause fluid retention. Hormone-based medications, including estrogen, progesterone, and testosterone, can do the same. Even some beta blockers and older blood pressure drugs like hydralazine contribute to swelling.
If your feet started swelling around the time you began a new medication, that connection is worth exploring with whoever prescribed it. Switching to a different drug in the same class often resolves the problem. Don’t stop taking a prescribed medication on your own, but do flag the symptom.
Swollen Feet During Pregnancy
Some degree of foot swelling is normal during pregnancy, especially in the third trimester, as your body carries extra blood volume and the growing uterus puts pressure on the veins that return blood from your legs. Staying off your feet when possible, lying down with your legs elevated, and avoiding long periods of standing are the safest approaches.
What’s not normal: sudden swelling that gets noticeably worse over hours, swelling concentrated in one leg (which could signal a blood clot), or sudden puffiness in your face and hands. These can be signs of preeclampsia or deep vein thrombosis, both of which need immediate medical attention. A rapid increase in swelling paired with rising blood pressure is a red flag that warrants a same-day call to your provider.
Signs That Need Medical Attention
Most foot swelling is harmless and temporary. But certain patterns point to something more serious. Swelling in only one leg, especially with warmth, redness, or calf pain, can indicate a blood clot. This is more likely after long periods of immobility like a flight or surgery.
Swelling that comes with shortness of breath, chest pain, or an irregular heartbeat may signal fluid buildup in the lungs, which is a medical emergency. Persistent swelling that doesn’t improve with elevation, compression, and reduced sodium, or swelling that gradually worsens over weeks, can point to heart, kidney, or liver conditions that need evaluation. In these cases, the swelling itself isn’t the problem to solve. It’s a symptom of something else that needs treatment.