How to Get Fluid Out of Your Body and Reduce Swelling

Reducing excess fluid and swelling usually comes down to a handful of practical strategies: cutting back on sodium, staying active, elevating swollen limbs, wearing compression garments, and drinking enough water so your body stops hoarding what it has. Which approach works best depends on why the fluid built up in the first place, and that “why” ranges from something as benign as sitting on a long flight to something that needs a doctor’s attention, like heart or kidney trouble. The good news is that most everyday fluid retention responds well to changes you can make at home.

Why Your Body Holds Onto Fluid

Swelling, or edema, happens when fluid leaks out of your small blood vessels faster than your lymphatic system can drain it away. Under normal conditions, a balance of pressures inside and outside your capillaries keeps fluid moving in and out at roughly equal rates. When that balance tips, fluid pools in the spaces between your cells and you see puffiness, tight skin, or the classic “sock-line” indentation around your ankles.

Several things can tip that balance. High sodium intake pulls water into your bloodstream and raises the pressure that pushes fluid outward through capillary walls. Gravity does something similar when you sit or stand for hours: blood pools in your lower legs, venous pressure climbs, and fluid seeps into the surrounding tissue. During a simulated ten-hour flight, for instance, lower-leg volume increased by about 145 milliliters, accompanied by a measurable rise in total body water and tissue thickness around the shin.¹ Inflammation, hormonal shifts, and certain medications can all widen the gap between what leaks out and what gets reabsorbed or drained.

Reduce Your Sodium Intake

Salt is the single biggest dietary driver of fluid retention for most people. Your kidneys regulate the body’s water balance partly by adjusting how much sodium they reabsorb, and when sodium levels are high, water follows it.² A study of older men found that daily salt intake correlated directly with afternoon leg edema and with greater shifts in leg fluid over the course of the day.³

Most guidelines suggest keeping sodium below about 2,300 milligrams a day, which is roughly a teaspoon of table salt. In practice, the majority of sodium in a typical diet comes from processed and restaurant foods rather than from the salt shaker. Reading labels, choosing fresh ingredients, and seasoning with herbs or citrus instead of salt are the most reliable ways to cut back. A study in hemodialysis patients showed that restricting dietary sodium also reduced markers of inflammation, which matters because inflammation itself drives fluid leakage.⁴

Potassium works as a natural counterbalance to sodium. Your kidneys handle the two minerals in tandem: higher potassium intake helps your body excrete more sodium, which in turn reduces water retention. Foods rich in potassium include bananas, potatoes, spinach, beans, and avocados. People with kidney disease should check with their doctor before loading up on potassium, since impaired kidneys can struggle to clear the excess, but for most healthy adults, getting more potassium through food is both safe and helpful.

Drink More Water, Not Less

It sounds counterintuitive, but drinking adequate water actually helps your body let go of stored fluid. When you are even mildly underhydrated, your body ramps up production of a hormone called vasopressin (also known as antidiuretic hormone), which tells your kidneys to hold onto water. Increasing daily water intake brings vasopressin levels back down, allowing more dilute urine and less fluid retention.⁵

Chronic underhydration does more than just make you puffy. Research has linked persistently elevated vasopressin and concentrated urine with increased risk of chronic disease and even accelerated aging over the long term.⁶ The lesson is simple: sipping water consistently throughout the day gives your kidneys the signal that it is safe to release fluid rather than conserve it. There is no magic number of glasses that works for everyone, but pale yellow urine is generally a good indicator that you are drinking enough.

Move Your Legs and Use Gravity to Your Advantage

If your swelling concentrates in your feet, ankles, or lower legs, the calf muscles are your best built-in pump. Each time you contract those muscles while walking, cycling, or even doing seated calf raises, they squeeze the veins in your lower leg and push blood and lymphatic fluid back toward your heart. Researchers found that just 18 minutes of cycling reduced calf volume, with a stronger effect at higher workloads.⁷ Electrical stimulation of the calf muscle pump has also been shown to reverse fluid pooling in people who already had edema.⁸

For people with chronic venous insufficiency, where weakened vein valves allow blood to pool in the legs, structured exercise programs can restore normal calf pump function over a period of months. A randomized trial found that six months of supervised exercise brought calf pump measurements back into the normal range, while the control group showed no improvement.⁹ Even if you do not have venous disease, getting up to walk for a few minutes every hour during a desk-bound day or a long flight can prevent fluid from settling in your legs.

Elevation is the simplest gravity-based fix. Propping your legs above the level of your heart lets fluid drain passively out of the tissues without your muscles needing to do the work. Fifteen to twenty minutes of elevation a few times a day is a standard recommendation for anyone dealing with ankle or lower-leg swelling. Combining elevation with gentle ankle circles or toe-pointing movements keeps the lymphatic system active at the same time.

Compression Garments

Compression stockings work by applying graduated pressure, tightest at the ankle and looser as they move up the leg, which counteracts gravity’s effect on venous blood and interstitial fluid. A randomized trial in healthy women found that wearing compression stockings for eight to sixteen weeks significantly increased lymph pumping pressure in the legs, with higher-compression stockings producing a greater effect.¹⁰ For the best results, put them on first thing in the morning before fluid has a chance to accumulate. Over-the-counter stockings in the 15 to 20 mmHg range are a reasonable starting point; higher compression levels are available by prescription and are typically used for diagnosed venous conditions or lymphedema.

Compression is not limited to the legs. People recovering from surgery sometimes use compression wraps on the affected limb, and compression sleeves are commonly prescribed after breast cancer surgery to manage arm lymphedema. The principle is the same regardless of the body part: external pressure helps push fluid back into the lymphatic and venous systems.

Manual Lymphatic Drainage and Massage

Manual lymphatic drainage is a specialized, very light-pressure massage technique designed to encourage lymph flow through the body’s network of lymph vessels. It is distinct from ordinary deep-tissue massage, and the evidence for it is specific rather than broad. A systematic review found that manual lymphatic drainage showed the most reliable benefits for reducing edema after acute ankle sprains and wrist fractures, while its usefulness for other conditions was less clear.¹¹

For lymphedema patients, manual drainage is often combined with compression bandaging, exercise, and skin care in what clinicians call complete decongestive therapy. If you are dealing with straightforward fluid retention from diet, sitting, or mild injury, a simpler self-massage may help: use gentle, sweeping strokes directed toward the nearest group of lymph nodes (behind the knee or in the groin for leg swelling). The pressure should be light enough that you are just moving the skin, not pressing into the muscle beneath.

When Medications Cause the Swelling

Certain prescription drugs are well known for causing peripheral edema. Calcium channel blockers, a common class of blood pressure medication, are among the most frequent culprits. They work by relaxing the arteries, which lowers blood pressure. The problem is that this relaxation happens on the arterial side without a matching change on the venous side, which increases the pressure pushing fluid out of capillaries.¹² The resulting ankle swelling is not dangerous, but it can be uncomfortable enough that people stop taking their medication.

Other common offenders include corticosteroids, certain diabetes drugs, nonsteroidal anti-inflammatory drugs taken regularly, and some antidepressants. If you notice new or worsening swelling after starting a medication, bring it up with your prescriber rather than stopping the drug on your own. There are often alternative medications or dose adjustments that can reduce the side effect without sacrificing the therapeutic benefit.

Hormonal Fluid Shifts

Many women notice cyclical bloating and swelling tied to their menstrual cycle, and there is a physiological basis for it. Estrogen lowers the threshold at which the body triggers vasopressin release and thirst, effectively shifting the set point for fluid regulation and expanding plasma volume.¹³ Research has also shown that when estrogen and progesterone levels are high (the luteal phase of the menstrual cycle or the high-hormone phase of oral contraceptive use), the body retains more sodium and expands plasma volume less readily after a sodium load, likely because aldosterone and vasopressin are both elevated.¹⁴

Practically, this means the same dietary sodium that barely registers during one week of your cycle might cause noticeable ankle puffiness or bloating during another. The strategies are the same as for any other fluid retention: watch your salt, stay hydrated, move around, and wear compression if the swelling is bothersome. Recognizing the hormonal pattern can at least spare you the worry that something is wrong when the bloating arrives on schedule each month. Pregnancy amplifies these hormonal effects substantially, and some degree of lower-extremity swelling is expected in the third trimester, though sudden or severe swelling warrants medical evaluation.

Herbal and Natural Diuretics

A number of foods and herbs have a reputation as natural diuretics, though the evidence varies widely. Dandelion leaf extract is one of the few that has been tested in people. A small pilot study found that a standardized dandelion leaf extract significantly increased urination frequency and urine output over a five-hour period after dosing.¹⁵ That said, the study involved only 17 people and measured effects over a single day, so it is far from definitive.

Other commonly cited natural diuretics include parsley, hibiscus tea, and celery seed. Caffeine has a mild short-term diuretic effect, though habitual coffee drinkers develop tolerance quickly. The overall effect of any of these is modest compared to prescription diuretics, and none of them should be used as substitutes for medical treatment when edema has a serious underlying cause. They can, however, complement the dietary and lifestyle changes discussed above for mild, everyday fluid retention.

Prescription Diuretics

When lifestyle changes are not enough, doctors often prescribe diuretic medications, commonly called “water pills.” These drugs work by blocking specific sodium-reabsorption pathways in the kidneys, which forces more sodium and water into the urine. The two most commonly prescribed classes target different parts of the kidney’s tubule system, giving physicians options to tailor treatment to the severity and cause of the edema.¹⁶

Diuretics are particularly important in heart failure, where the heart’s reduced pumping ability triggers a cascade of hormonal signals that tell the kidneys to retain sodium and water. The body’s intent is to maintain blood pressure and organ perfusion, but the side effect is fluid overload that shows up as swollen ankles, congested lungs, and shortness of breath.^{17 18} Diuretics break that cycle by overriding the kidneys’ sodium-hoarding signals. They require monitoring, though, because pulling too much fluid too fast can drop blood pressure, deplete potassium, or strain the kidneys.

Inflammation, Allergies, and Injury Swelling

Not all edema comes from too much fluid circulating through an otherwise normal system. Inflammation, whether from an injury, an allergic reaction, or an autoimmune condition, directly increases the leakiness of blood vessel walls. Histamine, the chemical behind hives and hay-fever congestion, dilates blood vessels and disrupts the junctions between the cells lining venules, allowing plasma to seep into surrounding tissue.¹⁹ This is why a bee sting swells locally and why antihistamines can reduce that swelling: they block the chemical signal that makes the vessel walls leaky.

For acute injuries like a sprained ankle, the inflammatory response is actually helpful in the short term because it delivers immune cells and growth factors to the damaged area. The classic RICE protocol (rest, ice, compression, elevation) manages the swelling while letting the healing process continue. Ice narrows blood vessels in the injured area, compression limits the space available for fluid to pool, and elevation lets gravity assist drainage. After the first couple of days, gentle movement usually helps more than continued rest, since muscle contractions drive fluid out of the tissues as described earlier.

Chronic inflammatory conditions like rheumatoid arthritis or lupus can cause persistent swelling in affected joints. In these cases, managing the inflammation itself with appropriate medication is the most effective way to control the edema, since the fluid accumulation is a symptom rather than the root problem.

Insulin Resistance and Fluid Retention

People with insulin resistance, prediabetes, or type 2 diabetes sometimes experience more fluid retention than they would expect. Insulin is a powerful promoter of sodium reabsorption in the kidneys, acting on multiple segments of the kidney’s tubule system to hold onto sodium.²⁰ When insulin levels are chronically elevated, as they often are in insulin resistance, the kidneys get a sustained signal to retain more sodium and therefore more water.²¹

This connection helps explain why people who start a low-carbohydrate diet often lose several pounds of water weight in the first week: lower carbohydrate intake leads to lower insulin levels, which lets the kidneys release sodium and water they had been holding. It also means that managing blood sugar and insulin sensitivity through exercise, weight management, and dietary changes can help with fluid retention as a welcome side benefit, even if reducing swelling was not the original goal.

When Swelling Needs Medical Attention

Most mild, symmetrical swelling in the legs after a long day of standing or a salty meal is nothing to worry about. But certain patterns warrant a visit to your doctor. Edema in chronic venous disease results from capillary filtration exceeding lymphatic drainage, and it tends to worsen progressively if the underlying vein problems are not addressed.²² Swelling in just one leg can signal a blood clot, a blocked lymph node, or an infection, and should be evaluated promptly.

Swelling accompanied by shortness of breath, rapid weight gain over a few days, or reduced urine output may point to heart, kidney, or liver problems that require medical treatment. In heart failure, the fluid overload is a sign that the heart is struggling and the body’s compensatory mechanisms have gone into overdrive. Diuretics can manage the symptom, but the underlying cardiac issue needs its own treatment plan. Similarly, sudden facial swelling, swelling of the lips or throat, or swelling that appears immediately after starting a new medication could indicate an allergic reaction that needs urgent care.

A useful self-check for leg edema is the pitting test: press your thumb firmly into the swollen area for about ten seconds, then release. If a visible indentation remains for several seconds, that is pitting edema, which usually indicates fluid with a relatively low protein concentration. Non-pitting edema, where the tissue springs right back, can suggest lymphedema or thyroid-related swelling, both of which require different management approaches. Either way, persistent edema that does not improve with elevation, sodium reduction, and movement over the course of a week or two is worth discussing with a healthcare provider.