Gout in the Knee

NICE guidance lists the knee among the joints gout commonly presents in beyond the first MTP (big toe) joint. It's a large, frequently used weight-bearing joint, and while the big toe and other smaller joints further from the body's core are the most classic sites, gout can affect any joint, including large ones like the knee.

Gout in the knee can occur on its own, or alongside a history of gout elsewhere — the toe, ankle or other joints. Having had gout in a smaller joint before doesn't guarantee it will ever reach the knee, and equally, the knee can be the very first joint gout ever affects.

The knee typically looks swollen, sometimes noticeably so if fluid has accumulated — the normal contours around the kneecap can fill out or disappear entirely. The skin over the joint often feels warm. On lighter skin, redness is often the most obvious visible sign; on deeper skin tones, darkening of the skin compared with the surrounding area, along with swelling and warmth, tends to be the more reliable clue.

Onset is usually rapid — commonly within hours, without needing any particular event to trigger it. For more on how quickly gout symptoms typically develop, see our gout symptoms guide.

Left untreated, a knee flare commonly follows a similar course to other joints, often settling within one to two weeks, with appropriate treatment started early usually shortening this. We cover the full timeline, and what affects it, in our dedicated guide to how long a gout attack lasts.

Osteoarthritis of the knee typically develops slowly — Versus Arthritis describes it as something that "can develop over just a year or two, but more often it's a slow process over many years." The pain usually fits a predictable pattern: it tends to be "worse at the end of the day, or when you move your knee," easing with rest, with morning stiffness that "won't usually last more than half an hour." Osteoarthritis often affects both knees at once, and swelling can come from bony changes at the joint edges as well as, sometimes, an effusion.

Gout, by contrast, tends to arrive suddenly — often overnight — as a single, severely painful, hot, swollen joint, usually affecting one knee at a time rather than both together. There's no gradual build-up over months or years, and rest alone doesn't quickly settle it the way it might with a mild osteoarthritis flare-up.

Diagnosis usually starts with your history and an examination of the joint. A blood test measuring serum urate is common — NICE guidance treats a level of 360 micromol/litre (6 mg/dL) or higher as supportive of gout — but timing matters: urate can be misleadingly normal during an actual flare, so if the result is below that threshold but gout is still suspected, guidance recommends repeating the test at least two weeks after the flare has settled.

Because the knee often accumulates fluid when inflamed, joint aspiration — taking a small sample of that fluid with a needle — is particularly useful here. NICE guidance recommends clinicians "consider joint aspiration and microscopy of synovial fluid if a diagnosis of gout remains uncertain or unconfirmed," which allows the fluid to be checked directly for urate crystals or for signs of infection. Where aspiration isn't possible, imaging such as X-ray, ultrasound or dual-energy CT can be considered instead. For the fuller picture on what the numbers mean, see our uric acid and gout guide.

Because the knee is a major weight-bearing joint involved in almost every movement — walking, standing, using stairs, sitting down and standing up — an active flare here can affect daily activity more broadly than a flare in a smaller joint. Resting the joint and avoiding unnecessary bending or weight-bearing where practical is the standard advice during a flare, with a stick or other support sometimes helpful, and normal activity resumed gradually as pain and swelling settle.

If the knee is completely unable to bear weight, looks visibly deformed, or you're unable to move it at all, that points more towards a significant injury or a more serious problem than towards an uncomplicated gout flare, and is a reason for urgent assessment rather than home management.

Yes — without addressing the underlying uric acid level, attacks affecting the knee commonly recur, and over time can become more frequent or start affecting other joints too. This is usually a sign the underlying urate problem deserves proper attention rather than repeated rounds of flare treatment alone; our uric acid and gout guide and gout treatment guide cover the long-term options.

With longstanding, poorly controlled gout, some people develop tophi — firm deposits of urate crystals that can form under the skin near affected joints, including around the knee. This is a more advanced pattern than a single attack and isn't something every newly diagnosed person needs to worry about, particularly if it's identified and managed early.