Gout: an animated, cited guide

This page needs JavaScript for its animations. The outline and key answers are below, and every claim in the full version carries a numbered citation.

Not medical advice. Gout Companion is an educational synthesis of published literature. It does not replace a clinician.

What is in it

What gout is Who gets it, the numbers, and the four stages from high urate to tophi.
Where urate comes from Purines, xanthine oxidase, and how the kidney and gut handle urate.
Crystals vs serum urate Why crystals form above about 6.8 mg/dL and dissolve below the target.
A flare, hour by hour From a shed crystal to the NLRP3 inflammasome, interleukin-1β and neutrophils, then resolution.
Colchicine inside the cell From the pill to the neutrophil to the microtubule.
Treating a flare Colchicine, NSAIDs, glucocorticoids, IL-1 blockers and ice.
Colchicine dosing and safety Published doses, kidney function and drug interactions.
How urate-lowering drugs work Allopurinol, febuxostat, uricosurics and pegloticase.
Treat to target Titrating to below 6 mg/dL, and why flares rise in the first months.
Safety of urate-lowering drugs HLA-B*58:01, the CARES and FAST trials, interactions.
Diagnosis and the ACR/EULAR score Crystals under polarised light, imaging, and the 2015 classification calculator.
The differential Calcium pyrophosphate crystal arthritis, septic arthritis, cellulitis and others.
Gout, kidneys and heart Chronic kidney disease, stones, blood pressure and cardiovascular risk.
Living with gout Diet, alcohol, weight, other medicines and a flare plan.
Nursing care Assessment, giving the medicines, teaching and documentation.
Toward a cure Dissolving crystals for good, and the research pipeline.
History and people From podagra to polarised light and allopurinol.
Flashcards, quiz and glossary Revision for students.
Sources Every reference behind the app.

Part 5 · Living, care & the future

Living with gout

Food matters a little and the urate-lowering medicine matters most, so living with gout is mostly a plan, a few blood tests and a flare kit. Press play to walk a first year on treatment, and use the toggles to drop real-life events into it. Everything here is what studies and guidelines report, not advice for any one person.

Add to this year

Through the year

Schematic year. Intervals follow published guidance, not any one clinic.

How far each change moves urate

Grow bars

Average changes in different groups, study designs and lengths of time, so they are not a menu that adds up. The coffee figure is cross-sectional, not a trial. µmol/L in brackets. ^{52,135,191,192,244,380}

The gap to target is usually bigger than diet

ACR 2020 sets a serum urate below 6 mg/dL [360 µmol/L] for everyone on urate-lowering therapy. ¹³⁵ In the only DASH trial in people with gout, urate started at 8.1 mg/dL [482 µmol/L] and the result was inconclusive. ¹⁹³ In 30 people already on treatment, detailed dietary teaching raised knowledge scores but did not change urate at 6 months. ¹⁶⁷ In the DIRECT weight-loss trial urate fell by about 0.81 mg/dL [48 µmol/L] at 6 months and 0.30 mg/dL [18 µmol/L] at 2 years, whichever diet people followed. ⁴⁴¹

Weight, more than single foods

A mean 5 kg weight loss lowered urate by 1.1 mg/dL, and a BMI rise of more than 5% carried 60% higher odds of a recurrent flare, a fall of more than 5% 40% lower odds. The first month after bariatric surgery may bring a short-lived rise in flares. ¹³⁵ In a review of 10 weight-loss studies, 6 of 8 showed fewer flares, at low certainty. ²⁹⁵ In US men, being overweight, alcohol, a low DASH score and diuretics together accounted for 77% of new gout, and in men with obesity weight came first. ²⁵⁶

Genes or diet?

16,760 US adults of European ancestry in 5 cohorts. Each diet score explained 0.3% or less of the variation in serum urate; common genome-wide variation explained 23.9%. ²⁴⁴ That is a different question from what causes new gout, where weight and diuretics matter a lot. ²⁵⁶

Gout is not a diet failure. ACR 2020 treats diet and other medicines as areas for shared decision-making, and its panel aimed to give guidance "without implying any patient-blaming", because gout has strong genetic determinants. ¹³⁵ In interviews and surveys, people with gout describe shame and the belief that it is self-inflicted, and both get in the way of treatment. ^232,376

What raises the risk, and what sets off a flare

Show

What ACR 2020 recommends

Recommendation	Strength	Certainty of evidence
Limit alcohol	Conditional	Low
Limit purine intake	Conditional	Low
Limit high-fructose corn syrup	Conditional	Very low
A weight-loss programme if overweight or obese (none named)	Conditional	Very low
Do not add vitamin C supplements	Conditional, against	Low
Switch hydrochlorothiazide to another antihypertensive when feasible	Conditional	Very low
Choose losartan preferentially when feasible	Conditional	Very low
Do not stop low-dose aspirin taken for an appropriate reason	Conditional	Very low
Do not add or switch to fenofibrate	Conditional	Very low
Cherries, dairy protein	No recommendation	Low or very low
Treat flares with colchicine, an NSAID or a glucocorticoid; low-dose over high-dose colchicine	Strong	Not restated here (see 2.2 and 3.2)
Anti-inflammatory prophylaxis for 3–6 months when urate-lowering therapy starts	Strong	Not restated here (see 2.2 and 3.2)

The lifestyle recommendations apply "regardless of disease activity", and gout flare was the only critical outcome considered for them. Any switch of another medicine should happen only when the urate and gout benefit outweighs the risk of changing. ¹³⁵ EULAR 2016 adds encouraging low-fat dairy and regular exercise, avoiding sugar-sweetened drinks, heavy meals and excessive meat and seafood, and teaching people to self-medicate at the first warning symptoms of a flare. ³³¹

Flares, hospital, pregnancy, work

A flare plan: "medication-in-pocket"

The ACR 2020 patient panel asked for an at-home strategy for people who recognise their early flare signs. ACR strongly recommends colchicine, an NSAID or a glucocorticoid as first-line flare treatment, and conditionally recommends ice as an add-on. ¹³⁵ The US colchicine label gives 1.2 mg at the first sign of a flare and 0.6 mg one hour later, at most 1.8 mg in that hour. ¹¹⁷ The allopurinol label says to keep taking allopurinol during a flare. ¹¹⁵

In plain wordsAgree a plan with your clinician before the next flare. Keep the medicine at home, start at the first twinge, and keep taking the daily urate pill.

Hospital and surgery

RR 10.2In a population cohort of 429 people with gout, the flare rate rose about tenfold in hospital, and an in-hospital flare lengthened the stay by 1.8 days. ⁴⁵⁶ After surgery, 31 of 70 people with gout flared, a mean 3.7 days after the operation; the big toe was involved in only 13%. Taking allopurinol carried OR 0.15 and a preoperative urate ≥ 9 mg/dL OR 3.77. ¹⁸³ In an older series, almost all postoperative flares came with fever, and many people had tests for unexplained fever first. ⁶⁵

Predicting an inpatient flare

The GOUT-36 rule counts four things before admission: no flare prophylaxis, no urate-lowering therapy, a tophus, and a urate above 0.36 mmol/L [6 mg/dL] in the past year. It had 75% sensitivity and 67% specificity; 80% of very-high-risk patients flared against 11% of low-risk patients. ¹⁸² Regular urate-lowering therapy before admission went with a 10% shorter stay in 36,047 admissions. ¹⁸¹

Pregnancy and breastfeeding

Gout is uncommon in younger women: 0.6 per 1000 person-years under 45, against 2.5 at 75 or older. ¹⁵¹ BSR 2023 says colchicine "may be considered during pregnancy" (1B) and may be used in breastfeeding (2C), based on 550 exposed pregnancies with no rise in malformations or miscarriage. ^176,356 It advises NSAIDs only intermittently, weaning from 26 weeks and stopping by 30. ³⁵⁶ The allopurinol label notes possible fetal harm in animal data and advises against breastfeeding on it; febuxostat has insufficient human pregnancy data. ^115,127

Work, shoes and exercise

Among about 300,000 US employees, people with gout had 4.56 more health-related absence days a year. ²⁰⁹ Adding an athletic shoe to podiatry did not reduce foot pain at 6 months, though fit and comfort scores improved. ¹³⁸ People with gout describe comfort first, knowing what to buy, and tophi and flares limiting shoe choice. ¹³⁹ In interviews, uncertainty about whether exercise could set off flares held people back, "particularly in the absence of gout-specific advice". ³⁸⁵

Water, cherries, milk Early evidence

No trial of drinking more fluid in gout was found; the allopurinol label's urine output of at least 2 litres a day is there to prevent stones. ¹¹⁵ Cherries over 2 days went with fewer flares (OR 0.65) in a case-crossover study, with no randomised trial behind it. ⁴⁴⁹ Milk lowered urate acutely by about 10% in a crossover trial, and enriched skim milk powder reduced flares in a 3-month trial. ^73,76 Sugar-sweetened drinks raised gout risk; diet soft drinks did not. ⁵³

Monitoring and the clinic visit

The monitoring checklist in the guidelines and labels

Target serum urate below 6 mg/dL [360 µmol/L] on urate-lowering therapy (ACR 2020, strong); EULAR 2016 suggests below 5 mg/dL [300 µmol/L] in severe gout. ^135,331
Urate checked every 2–5 weeks while the dose is being raised and after each dose change, with titration taking "weeks to months, not years". ¹³⁵
Once at target, every 6 months (ACR 2012), partly as a check on adherence. ²⁰²
Before allopurinol, the label lists urate, a full blood count, a chemistry panel, liver tests and kidney function. Before febuxostat, a liver panel. ^115,127
Urate-lowering therapy continued indefinitely (ACR 2020, conditional): only 13% (27 of 211) stayed flare-free for 5 years after stopping, even with urate under 7 mg/dL. ¹³⁵
A normal urate during a flare does not rule gout out: 14% of people in a flare had 6 mg/dL or less. ³⁵⁴

Questions people bring to a visit

Plain-words prompts built from what the guidelines say should be discussed. They start a conversation with a clinician; they are not a script and not advice.

What is my urate today, and how far is it from below 6 mg/dL?
When is the next dose step and the next blood test?
What is my flare plan, and do I keep my daily pill during a flare?
How long should I stay on flare prophylaxis?
Do any of my other medicines raise urate, and is there an alternative?
What should happen if I need an operation or a hospital stay?
Should my kidneys, blood pressure or heart be checked too?

In plain wordsTwo numbers do most of the work: your urate on the last test, and how many flares you had since the visit before.

Exam hookACR 2020 lifestyle advice is all conditional: limit alcohol, purines and high-fructose corn syrup, lose weight if overweight, no vitamin C. Do not stop low-dose aspirin; switch hydrochlorothiazide where feasible; prefer losartan. Diet explains ≤ 0.3% of urate variance, genetics 23.9%. Hospital raises flare rates about tenfold.

In plain wordsGout is not your fault: much of it comes from the genes and kidneys you were born with. Food and drink matter a little, and the daily urate medicine matters most. Flares in the first months mean crystals are dissolving, not that the pill has failed. Keep a flare plan, and tell any hospital team that you have gout.