Aesthetic Clinic

Gout in the Knee: Symptoms, Causes, and Every Treatment Option Explained

10 July 2026

14 min read

Gout in knee treatment guide medical feature image

✅ Medically reviewed | Updated July 2026

Most people associate gout with the big toe — the classic image of a painful, swollen joint that appears overnight without warning. But gout does not confine itself to the foot. The knee is one of the most commonly affected joints in gout, and when it strikes there, it can be severe enough to make walking impossible.

What makes gout in the knee particularly frustrating is how often it is misdiagnosed. A hot, swollen knee that appeared overnight can look like a septic joint, a flare of osteoarthritis, a meniscal problem, or simply an unexplained injury. Getting the diagnosis right matters — because the treatment for gout is completely different from the treatment for any of those other conditions, and an untreated gout attack in the knee gets significantly worse before it gets better.

This guide covers everything you need to know about gout in the knee: what it is, what causes it, how to recognise it, and every treatment option available in the UK.

What Is Gout and Why Does It Affect the Knee?

Gout is a type of arthritis that causes sudden, severe joint pain. It is caused by hyperuricaemia — elevated levels of uric acid in the blood. When uric acid concentrations exceed the body’s ability to keep it in solution, monosodium urate crystals form and deposit inside joint cavities and surrounding tissue.

The main symptoms of gout are sudden severe pain in a joint — usually your big toe, but it can be in other joints in your feet, ankles, hands, wrists, elbows or knees.

The knee is affected in approximately 30 to 40 percent of people with gout — making it the second most commonly affected joint after the big toe. In some patients, particularly those with long-standing or poorly managed gout, the knee is the primary joint affected.

The reason gout affects certain joints more than others relates to temperature and blood flow. Uric acid crystallises more readily in cooler, lower-blood-flow environments — which is why peripheral joints, including the knee, are particularly vulnerable.

When urate crystals deposit inside the knee joint, white blood cells engulf them and trigger an intense acute inflammatory response. This is what causes the characteristic sudden, severe pain of a gout attack — not the crystals themselves directly, but the inflammatory reaction they provoke inside the joint.

Symptoms of Gout in the Knee

Gout in the knee presents differently from most other causes of knee pain. The pattern is distinctive enough that an experienced clinician can often make a working diagnosis from the history alone.

The classic presentation of gout in the knee includes:

Sudden onset. The pain typically comes on rapidly — often overnight or within a few hours. You may go to bed with a mildly uncomfortable knee and wake unable to put weight on it.

Severe pain. Gout causes sudden severe joint pain. This is not mild aching — it is intense, often described as the worst joint pain a patient has ever experienced. The pain is present at rest and significantly worsened by any movement or touch.

Swelling. The knee becomes visibly swollen as the joint fills with inflammatory fluid. The swelling can be significant and appears rapidly alongside the pain.

Warmth and redness. Hot, swollen, red skin over the affected joint. The knee feels warm or hot to the touch. The skin overlying the joint may appear red or flushed — though redness may be harder to see on black or brown skin.

Extreme sensitivity. The sensitivity of the joint during an acute gout attack is remarkable. Many patients describe being unable to tolerate the weight of a bedsheet on the knee. Even gentle air movement over the joint can be intensely painful.

Resolution without treatment. An attack of gout usually lasts 1 to 2 weeks if left untreated. The attack resolves on its own — but this should not be taken as reassurance that no treatment is needed. Untreated attacks tend to last longer, recur more frequently, and cause progressively more joint damage over time.

Between attacks. In the period between gout attacks, many patients are completely symptom-free. This is characteristic of gout and helps distinguish it from conditions like rheumatoid arthritis or osteoarthritis, where some degree of ongoing discomfort is usually present.

How Is Gout in the Knee Different From Other Causes of Knee Swelling?

This is a clinically important distinction. A hot, swollen, painful knee can have several causes — and the urgency and treatment approach differs significantly between them.

Feature	Gout	Septic Arthritis	Osteoarthritis	Rheumatoid Arthritis
Onset	Rapid — hours	Rapid — hours	Gradual — months/years	Gradual — weeks/months
Pain severity	Extreme	Extreme	Moderate	Moderate to severe
Warmth/redness	Yes	Yes — more marked	Mild	Mild to moderate
Temperature	Normal or mildly elevated	Often high fever	Normal	Normal or mildly elevated
Pattern	Attacks with symptom-free intervals	Continuous and worsening	Persistent, worse with activity	Persistent, worse with rest
Both knees	Rarely	Rarely	Can affect both	Usually both
Confirmed by	Uric acid blood test, crystal analysis	Joint fluid culture	X-ray, clinical history	Blood tests (RF, anti-CCP)

The most important distinction to make urgently is between gout and septic arthritis. Both present with sudden, severe knee pain, swelling, warmth, and redness. The key differentiator is a high fever — above 38°C — alongside general illness (chills, nausea, feeling very unwell). If these systemic features are present, seek same-day emergency care. Septic arthritis is a medical emergency that can destroy a joint within days.

What Causes Gout in the Knee?

Gout is caused by having too much uric acid in your blood. This can lead to crystals forming around your joints, which causes pain.

Uric acid is a natural breakdown product of purines — compounds found in many foods and produced naturally by the body. Normally, uric acid dissolves in the blood, passes through the kidneys, and is excreted in urine. When uric acid levels are persistently elevated — either because the body produces too much or the kidneys excrete too little — crystals begin to form.

Who Gets Gout in the Knee?

It’s more common in men, especially as they get older. Women are relatively protected before the menopause because oestrogen promotes uric acid excretion by the kidneys. After the menopause, women’s uric acid levels rise and gout risk increases. You might have a higher chance of getting gout if you are overweight, drink alcohol, have been through the menopause, take medicines such as diuretics (water tablets), or medicines for high blood pressure (such as ACE inhibitors), have high cholesterol, high blood pressure, kidney problems, osteoarthritis or diabetes, or have had surgery or an injury.

What Triggers a Gout Attack in the Knee?

You might get a gout attack if you have an illness that causes a high temperature, drink too much alcohol or eat a very large meal, get dehydrated, injure a joint, or take certain medicines.

Purine-rich foods — red meat, offal (liver, kidneys), shellfish, oily fish — raise uric acid levels acutely. Alcohol, particularly beer and spirits, both increases uric acid production and reduces renal excretion. Fructose — found in sugary drinks — also elevates uric acid significantly.

Dehydration is one of the most common immediate triggers. When blood volume decreases, uric acid concentration rises, increasing the risk of crystallisation. This is why gout attacks often occur after travel, illness, or after a heavy drinking session without adequate fluid intake.

How Is Gout in the Knee Diagnosed?

The GP may ask about your diet and if you drink alcohol. They may also do a test to measure how much uric acid is in your blood.

However, uric acid blood tests are not always conclusive — levels can be normal during an acute attack as urate shifts from blood into the joint. A normal uric acid level during a flare does not rule out gout.

The definitive diagnostic test is joint fluid analysis — aspirating a small sample of synovial fluid from the knee using a needle, and examining it under polarised light microscopy. Urate crystals appear as needle-shaped, negatively birefringent crystals. This test confirms the diagnosis with certainty.

If the test is still unclear, a GP may refer you to see a specialist (rheumatologist) and arrange further tests, including taking a sample of fluid from inside the affected joint using a thin needle. If this cannot be done or the diagnosis is still unclear, a scan will be arranged.

Imaging — particularly dual-energy CT scanning — can detect urate crystal deposits in and around the knee joint with high accuracy, even between attacks.

Treating Gout in the Knee

Treatment for gout in the knee has two distinct phases: treating the acute attack, and preventing future attacks.

Treating the Acute Attack

The goal is to stop the inflammation as quickly and completely as possible.

Attacks of gout are usually treated with a non-steroidal anti-inflammatory (NSAID), like ibuprofen. NSAIDs such as naproxen or indomethacin are first-line treatment for acute gout, taken at a therapeutic dose as early as possible after the attack begins. Starting treatment immediately — at the first sign of an attack — significantly reduces its duration and severity.

If the pain and swelling does not improve, you may be given steroids as tablets or an injection. A short course of oral prednisolone, or a corticosteroid injection directly into the knee, can rapidly control inflammation when NSAIDs are insufficient or contraindicated.

Colchicine — taken at low dose within the first 12 to 24 hours of an attack — is an effective alternative to NSAIDs, particularly for patients who cannot tolerate anti-inflammatory drugs. It works by interfering with the white blood cell response to urate crystals.

Alongside medication:

Rest and raise the limb. Keep the joint cool — apply an ice pack or a bag of frozen peas wrapped in a towel for up to 20 minutes at a time. Drink lots of water. Try to keep bedclothes off the affected joint at night.

Do not attempt to push through the pain with activity during an acute gout attack in the knee. The joint is acutely inflamed and loading it will intensify the inflammatory response.

Preventing Future Attacks — Urate-Lowering Therapy

A single gout attack in the knee, successfully treated, does not necessarily mean lifelong medication. But recurring attacks — or a uric acid level that remains persistently elevated — require a different approach.

If you have frequent attacks or high levels of uric acid in your blood, you may need to take uric acid-lowering medicine.

Allopurinol is the most commonly prescribed urate-lowering therapy in the UK. It works by inhibiting xanthine oxidase — the enzyme responsible for uric acid production. Taken daily and titrated to achieve a target serum uric acid level below 360 μmol/L, it significantly reduces attack frequency and, over time, dissolves existing crystal deposits.

Febuxostat is an alternative for patients who cannot tolerate allopurinol.

It’s important to take uric acid-lowering medicine regularly, even when you no longer have symptoms. Many patients make the mistake of stopping medication once attacks cease. Urate-lowering therapy is a long-term commitment — it works by keeping uric acid levels below the crystallisation threshold continuously.

Lifestyle Changes That Reduce Gout in the Knee

Making healthy lifestyle choices may mean you can stop or reduce further gout attacks. Lose weight if you are overweight, eat a healthy diet, have some alcohol-free days each week and try not to drink more than 14 units of alcohol a week, drink plenty of fluids to avoid getting dehydrated, exercise regularly but avoid intense exercise or putting lots of pressure on joints, and try to quit smoking.

Specific dietary changes that reduce uric acid levels:

Reduce red meat, offal, and shellfish
Eliminate or significantly reduce alcohol — particularly beer and spirits
Eliminate sugary drinks and high-fructose foods
Increase dairy consumption — low-fat dairy products reduce uric acid levels
Stay well hydrated — aim for two litres of water daily
Increase consumption of cherries or cherry extract — evidence suggests a modest urate-lowering effect

Ask a GP about vitamin C supplements — vitamin C reduces uric acid levels modestly

Complications of Untreated Gout in the Knee

If you get repeated attacks of gout over a long period of time (chronic gout) and are not treated, it can lead to damage in your joints, hard lumps called tophi under your skin (usually on your ears, fingers or elbows — they can be painful and have an impact on your daily life), kidney stones, and chronic arthritis (but this is rare).

Chronic tophaceous gout — where large urate crystal deposits (tophi) accumulate inside and around the knee joint — can cause permanent joint damage, significant deformity, and loss of function. This is entirely preventable with consistent urate-lowering therapy. Chronic gout in the knee is a failure of long-term management, not an inevitable outcome.

Gout and Knee Osteoarthritis — When Both Are Present

Gout and knee osteoarthritis frequently co-exist in older adults. Having osteoarthritis increases the risk of developing gout. Damaged cartilage surfaces and altered joint fluid composition create conditions that favour urate crystal deposition.

When both conditions are present, management becomes more complex. The gout needs to be treated and controlled first — acute joint inflammation must be resolved before any elective knee treatment is considered.

For patients whose primary knee pain is driven by osteoarthritis rather than active gout, the Arthrosamid injection is a non-biodegradable hydrogel treatment that integrates with the synovial tissue of the knee, providing sustained pain relief for up to five years in suitable patients. It is not a treatment for gout itself — but for the osteoarthritis that frequently accompanies or follows chronic gout-related joint damage, it represents a meaningful non-surgical option when other treatments have not provided sufficient relief.

For a full clinical overview of Arthrosamid — how it works, who it suits, what it costs, and what the evidence says — visit Best Private Knee Pain Clinic in London.

For related reading on knee swelling and joint pain in the context of multiple potential causes, our guides on knee swelling and pain without injury and can a swollen knee be dangerous cover the diagnostic landscape in detail.

For a clinical video explanation of how different conditions affect the knee joint — including the role of synovial fluid in gout and osteoarthritis — visit the Dr SNA Clinic YouTube channel.

When to Seek Urgent Medical Attention for a Swollen Knee

Ask for an urgent GP appointment or get help from NHS 111 if you have a sudden pain and swelling in a joint and the pain is getting worse, you also have a very high temperature (or you feel hot, cold or shivery), or you also feel sick or cannot eat. These symptoms could mean you have an infection inside your joint and need urgent medical help.

If you are unsure whether a hot, swollen knee is gout or infection, seek same-day medical attention. The two conditions require completely different treatments and the consequences of missing an infection are severe.

About Mr Syed Nadeem Abbas — Knee and Joint Expert at Dr SNA Clinic London

Every knee assessment at Dr SNA Clinic is carried out personally by Mr Syed Nadeem Abbas, MBBS, MRCSEd, MSc (Distinction). Mr Abbas spent six years in NHS Trauma and Orthopaedics at major hospitals including Cambridge and Oxford — giving him a surgical-level understanding of joint conditions including gout, osteoarthritis, and the complex presentations where both coexist.

He holds postgraduate membership of the Royal College of Surgeons of Edinburgh (MRCSEd) and an MSc in Aesthetic Plastic Surgery with Distinction from Queen Mary University of London. He holds formal certification in Arthrosamid injection therapy through the American Cellular Medical Association — one of a very small number of UK-based clinicians with this credential.

The clinic is based at 48 Wimpole Street, Marylebone, London W1G 8SF. CQC regulated. 4.9-star Google rating from verified patient reviews. Open Monday to Saturday, 10:00–18:00.

Related Reading From Dr SNA Clinic

Mr Syed Nadeem Abbas, MBBS, MRCSEd, MSc Aesthetic Plastic Surgery (Distinction) Medical Director, Dr SNA Clinic 48 Wimpole Street, Marylebone, London W1G 8SF GMC Registered | CQC Regulated | Monday to Saturday 10:00–18:00 +44 7955 836986 | info@drsnaclinic.com