Most knee swelling responds well to a combination of rest, ice, compression, elevation, and over-the-counter anti-inflammatory medication. You can start these at home right away, and many people notice improvement within two to four days. The key is understanding what’s causing the swelling, because that determines whether home care is enough or you need professional treatment.
Why Your Knee Is Swollen
Knee swelling falls into two broad categories. The first is fluid buildup inside the joint itself, called an effusion. The knee joint contains small fluid-filled sacs that help cushion and lubricate movement. When something irritates or damages the joint, whether from an injury, arthritis, or overuse, extra fluid floods in as part of the body’s protective response. This type of swelling makes the entire knee look puffy and round, and it often feels tight when you try to bend it.
The second type is localized swelling in the soft tissue around the knee. Tenderness directly over a tendon, along the joint line, or at a ligament attachment point usually points to tendonitis, a meniscal tear, or a sprain rather than a full joint effusion. Knowing the difference matters because an effusion inside the joint sometimes needs to be drained by a doctor, while soft tissue inflammation almost always improves with home treatment.
Start With RICE
The classic rest, ice, compression, and elevation approach remains the first-line treatment for knee swelling from most causes. Each step targets a different part of the swelling process, so doing all four together works better than any single one.
Rest
Stop the activity that triggered or worsened the swelling. This doesn’t necessarily mean total immobility. Gentle movement like walking short distances can help circulate fluid out of the joint. But avoid running, squatting, climbing stairs repeatedly, or anything that causes sharp pain.
Ice
Apply ice or a cold pack for 10 to 20 minutes at a time, with at least one to two hours between sessions. Always place a cloth or towel between the ice and your skin. Keep this up for two to four days if it seems to help. The cold constricts blood vessels and slows the flow of inflammatory fluid into the joint, which limits how much the swelling can build.
Compression
Wrap the knee with an elastic bandage or wear a compression sleeve. The goal is steady, even pressure. A properly applied compression wrap exerts about 28 to 32 mmHg of pressure on the skin, which is enough to control fluid accumulation without cutting off circulation. Start wrapping below the knee and work upward, overlapping each layer by about half. You should be able to slide a finger under the bandage. If your toes go numb, tingle, or turn blue, the wrap is too tight.
Elevation
Position your leg so your knee sits above the level of your heart. Lying on a couch or bed with two or three pillows under your calf and knee is the easiest way to do this. Aim for about 15 minutes at a time, three to four times a day. If you can’t get your leg that high, resting it on an ottoman or coffee table still helps by slowing the gravitational pull of fluid toward the joint. Elevation works best when combined with icing, so try doing both at once.
Anti-Inflammatory Medication
Over-the-counter NSAIDs reduce both pain and the inflammatory response that drives swelling. Two common options are ibuprofen and naproxen sodium. For ibuprofen (200 mg tablets), the standard dose is one to two tablets every four to six hours as needed, up to 1,200 mg per day. For naproxen sodium (220 mg tablets), take one to two tablets every 8 to 12 hours, up to 660 mg per day.
Naproxen lasts longer per dose, so it’s a better choice if you want fewer pills throughout the day. Ibuprofen kicks in faster, which can help more with acute pain. Take either one with food to protect your stomach, and don’t combine two different NSAIDs at the same time. If you have kidney problems, a history of stomach ulcers, or are on blood thinners, talk to a pharmacist or doctor before using these.
Acetaminophen can help with pain but does not reduce inflammation, so it won’t address the swelling itself.
What Helps Beyond the First Few Days
If swelling has been lingering for more than a week or keeps coming back, home care alone may not be enough. Several strategies can help with persistent or recurring swelling.
Gentle range-of-motion exercises prevent stiffness and encourage fluid to drain from the joint. Straightening and bending the knee slowly while seated, or doing ankle pumps while your leg is elevated, keeps the surrounding muscles active without stressing the joint. As the swelling decreases, you can add light strengthening work for the quadriceps and hamstrings, which stabilize the knee and reduce future flare-ups.
Topical anti-inflammatory gels applied directly over the knee can supplement oral medication with fewer side effects, since less of the drug enters your bloodstream. These are available over the counter and work best for swelling close to the skin surface.
When a Doctor Needs to Drain the Knee
Large, painful effusions that don’t improve with home treatment are sometimes drained through a procedure called aspiration. A doctor inserts a needle into the joint space and removes as much fluid as possible. This provides immediate pressure relief and also lets the doctor analyze the fluid to identify the cause, whether it’s inflammatory arthritis, gout, infection, or bleeding from an injury.
After draining the fluid, your doctor may inject a corticosteroid or other medication directly into the joint to reduce inflammation and prevent the fluid from returning quickly. The procedure itself takes only a few minutes and most people feel noticeably better immediately afterward.
Aspiration is especially useful when the swelling is severe enough to limit your ability to bend or straighten the knee, or when the cause of the swelling is unclear and needs diagnosis.
Signs That Knee Swelling Is an Emergency
Most knee swelling is not dangerous, but a joint infection (septic arthritis) is a serious exception that requires urgent treatment. Watch for this combination of symptoms: a knee that is red, hot to the touch, and extremely painful to move in any direction. Fever is common, with up to 90% of patients showing at least a low-grade temperature of 99.5°F or higher, though the absence of fever doesn’t rule it out.
The hallmark of a joint infection is that both active movement (you moving the knee) and passive movement (someone else moving it for you) are intensely painful. With most other causes of swelling, you can at least tolerate someone gently bending the knee for you. If you can’t, and the joint is red and warm, get to an emergency room. Untreated septic arthritis can permanently damage cartilage within days.
You should also seek prompt evaluation if swelling appeared suddenly after a twisting injury or impact (which may indicate a torn ligament or fracture), if the knee locks or gives way, or if swelling hasn’t improved at all after a full week of consistent home treatment.