Skip to content
GoutSafe
Menu

Understanding gout

Do I have gout?

Gout usually announces itself as sudden, severe pain in one joint - most often the big toe - that peaks within about 24 hours, with skin that turns red, hot, and shiny. No website can diagnose it, this one included: the only definitive test is a doctor drawing joint fluid and finding urate crystals under a microscope. What this page can do is show you how closely your situation matches the pattern, what else looks like it, and exactly what the visit looks like.

Source: 2015 ACR/EULAR classification criteria

Same-day care, not this page, if:

The joint is hot and swollen and you have a fever or feel unwell. A joint infection can look almost exactly like a gout flare and can damage the joint within days. One more thing worth knowing: the absence of fever does not rule infection out - only 57% of confirmed joint infections ran one. When in doubt, get seen the same day.

Source: Becker et al. 2016, Am Fam PhysicianMargaretten et al. 2007, JAMA

The signature of a flare

The classification criteria doctors use weigh a specific pattern: pain that reaches its maximum within 24 hours, redness over the joint, tenderness so severe the joint cannot bear touch, and great difficulty walking. Many attacks start overnight. For roughly half to three-quarters of people, the first attack lands in the big-toe joint, and about 73% of people with gout get it there at some point. The more of that pattern fits, the more likely this is gout - and "likely" is where a website's job ends.

Source: 2015 ACR/EULAR criteria (the episode features)Stewart et al. 2016, meta-analysis (the big-toe numbers)

What else looks like this

Several conditions produce a painful toe or a hot joint, and two of them need faster treatment than gout does. This table is why you see a doctor, not a way around one - the family-medicine literature is blunt that only examination, and often a joint-fluid test, can tell these apart.

Condition How it starts What it looks like How it behaves
Gout Sudden - often overnight, peaks within about 24 hours One joint red, hot, shiny, swollen, unbearable to touch Settles within about 2 weeks, then a pain-free gap
Joint infection (septic arthritis) Can be just as sudden Can look identical to gout - hot, swollen, severe Does not settle on its own and can destroy the joint within days. This is the one that makes same-day care matter
Pseudogout (CPPD) Sudden, gout-like Similar attack, more often knee or wrist, different crystal Settles like gout - only the joint-fluid test tells them apart
Cellulitis (skin infection) Hours to days Red, hot, spreading skin - the redness is not centered on a joint Needs antibiotics - another reason for a same-day look if skin is spreading red
Osteoarthritis flare Gradual background pain that worsens Stiff and achy more than red and hot Persistent, tied to use, not attack-shaped
Bunion and other toe complaints Gradual, over months to years A bony bump at the big-toe joint, sore in shoes, not red-hot Constant shape change, no attacks

Source: Becker et al. 2016 (acute monoarthritis differential)

What the doctor will actually do

  1. Examine the joint and take your history. Which joint, how fast the pain peaked, whether it has happened before, your medications, and your risk factors.
  2. Possibly draw fluid from the joint. A needle, a few minutes, and the only conclusive answer there is: urate crystals under a polarized-light microscope settle it as gout, and the same fluid rules the dangerous infection in or out.
  3. Test your uric acid - carefully. A high level supports the diagnosis, but 14% of people in an active flare test at or below 6 mg/dL, so a normal result mid-flare does not end the question. Doctors often retest a few weeks after the attack settles. What the number means band by band is on uric acid levels, explained.
  4. Sometimes image the joint. Ultrasound and dual-energy CT can show urate deposits when the fluid test is not practical.

When a fluid test is not practical, clinicians lean on the weighed pattern above - it classifies gout with about 92% sensitivity and 89% specificity in the validation study. One detail from that framework worth knowing: a very low uric acid level actually counts against gout in the scoring, which is another reason the blood test alone never settles it.

Source: 2015 ACR/EULAR classification criteriaSchlesinger et al. 2009 (normal urate mid-flare)

Who gets gout

About 3.9% of US adults have gout - 5.2% of men and 2.7% of women. In the 12-year study of 47,150 men, the risk roughly doubled with obesity (2.0x at BMI 25-30, 3.0x at BMI 35 and up), and ran 2.3x with high blood pressure and 1.8x with diuretic use. Genetics carries a large share: common genetic variants explain about 24% of the difference in uric acid between people, against under 1% for diet patterns - so a first flare is not proof you did something wrong. The hopeful number in the same study: men who lost 10 pounds or more cut their risk by about 39%.

Source: Chen-Xu et al. 2019, NHANESChoi et al. 2005 (risk factors)Major et al. 2018 (genetics vs diet)

What happens if I do nothing?

A typical flare peaks within a day and settles on its own within about two weeks. That is exactly what makes gout easy to shrug off - and recurrence is common: in a UK study of 51,784 people newly diagnosed, about 17% had a doctor-recorded second flare within a year and 36% within about four years, figures that undercount the flares people rode out at home. Getting diagnosed matters because the treatable causes are treatable: for a first flare, guidelines generally advise treating the inflammation and holding off on long-term urate-lowering medication, with exceptions (kidney disease, very high uric acid, kidney stones) that are exactly the judgment calls a doctor is for.

Source: Finnikin et al. 2023 (recurrence)ACP 2017 guidelineACR 2020 guideline

If it is gout, or your doctor says it likely is:

What to do during a flare covers the in-the-moment steps, and the food list and dish checker answer the "can I eat this?" questions that come next.

Quick answers

What does a gout attack feel like?

Sudden, severe pain in one joint - most often the big toe - that peaks within about 24 hours. The joint turns red, hot, shiny, and swollen, is often unbearable to touch, and walking is difficult. Many attacks start overnight. Untreated, a typical flare settles within about two weeks.

Can I have gout if my uric acid test came back normal?

Yes. In the largest study of active gout flares, 14% of people had uric acid at or below 6 mg/dL during the attack. A normal test during a flare does not rule gout out, which is why doctors often retest a few weeks later.

How can I tell gout from a bunion?

Speed and heat. Gout arrives suddenly, often overnight, with a red, hot, shiny joint that is unbearable to touch, then settles within about two weeks. A bunion builds gradually over months as a bony bump at the same joint, aches in tight shoes, and does not come in attacks. If your toe is hot and red, treat it as a possible flare and see a doctor.

When is a swollen joint an emergency?

A hot, swollen joint with a fever needs same-day medical care, because a joint infection can look almost exactly like gout and can damage the joint within days. And the absence of fever does not rule infection out - only 57% of confirmed joint infections had one. When in doubt, get seen.

Sources

  1. 1. Source: Neogi T, Jansen TLTA, Dalbeth N, et al. 2015 Gout Classification Criteria: An ACR/EULAR Collaborative Initiative. Arthritis Rheumatol. 2015;67(10):2557-2568. The classification framework: crystal identification is sufficient on its own. Otherwise joint pattern, episode features, urate level, and imaging are weighed.
  2. 2. Source: Stewart S, Dalbeth N, Vandal AC, Rome K. The first metatarsophalangeal joint in gout: a systematic review and meta-analysis. BMC Musculoskelet Disord. 2016;17:69. First flares start in the big-toe joint in roughly 43-76% of people across studies, and about 73% involve it at some point.
  3. 3. Source: Schlesinger N, Norquist JM, Watson DJ. Serum urate during acute gout. J Rheumatol. 2009;36(6):1287-1289. In 339 patients in an active flare, 14% had urate at or below 6 mg/dL.
  4. 4. Source: Becker JA, Daily JP, Pohlgeers KM. Acute Monoarthritis: Diagnosis in Adults. Am Fam Physician. 2016;94(10):810-816. "Acute monoarthritis with fever should be considered to have a bacterial etiology until proven otherwise."
  5. 5. Source: Margaretten ME, Kohlwes J, Moore D, Bent S. Does this adult patient have septic arthritis? JAMA. 2007;297(13):1478-1488. Across 6,242 patients, fever was only 57% sensitive for joint infection - its absence does not rule infection out.
  6. 6. Source: Chen-Xu M, Yokose C, Rai SK, Pillinger MH, Choi HK. Contemporary Prevalence of Gout and Hyperuricemia in the United States: NHANES 2007-2016. Arthritis Rheumatol. 2019;71(6):991-999. Gout affects 3.9% of US adults: 5.2% of men and 2.7% of women.
  7. 7. Source: Choi HK, Atkinson K, Karlson EW, Curhan G. Obesity, weight change, hypertension, diuretic use, and risk of gout in men: the Health Professionals Follow-up Study. Arch Intern Med. 2005;165(7):742-748. 47,150 men over 12 years: BMI >=35 RR 2.97, hypertension RR 2.31, diuretic use RR 1.77, weight loss of 10 lb or more RR 0.61.
  8. 8. Source: Major TJ, Topless RK, Dalbeth N, Merriman TR. Evaluation of the diet wide contribution to serum urate levels: meta-analysis of population based cohorts. BMJ. 2018;363:k3951. Common genetic variants explain about 24% of urate variance, diet patterns under 1%.
  9. 9. Source: Finnikin S, Mallen CD, Roddy E. Cohort study investigating gout flares and management in UK general practice. BMC Prim Care. 2023;24:246. Of 51,784 people newly diagnosed with gout, 17.4% had a recorded second flare within 12 months and 35.9% over a mean 4.1 years.
  10. 10. Source: Qaseem A, Harris RP, Forciea MA, et al. Management of Acute and Recurrent Gout: A Clinical Practice Guideline from the American College of Physicians. Ann Intern Med. 2017;166(1):58-68. Strong recommendation for corticosteroids, NSAIDs, or colchicine in acute gout, and against starting long-term urate-lowering therapy in most patients after a first attack.
  11. 11. Source: FitzGerald JD, et al. 2020 American College of Rheumatology Guideline for the Management of Gout. Arthritis Care Res. 2020;72(6):744-760.

Values are per 100g unless a note says otherwise, rounded to three significant figures. Per-serving figures are calculated from the unrounded measurement, so recomputing from the rounded number can differ by a milligram or so. A single determination is normal in food composition tables, not a defect. The fructose figure is derived, not a label value: it counts free fructose plus half of sucrose, because sucrose is half fructose and the body treats both the same way. A sucrose-sweetened food therefore carries roughly twice this much total sugar. Last reviewed August 11, 2026.

Not medical advice. This page describes published research on how gout presents and how it is diagnosed. It cannot diagnose you, and it is not a substitute for seeing a doctor - especially with a hot, swollen joint.