What Is Gout? A Plain-Language Guide
Gout is a form of inflammatory arthritis caused by crystals of sodium urate forming inside a joint, and the agony of an attack is not the crystals themselves but your immune system reacting to them. Urate is a normal waste product that everyone makes every day; gout happens when the level in your blood sits high enough, for long enough, that the urate stops staying dissolved. Understanding that one sentence explains almost everything else about the condition, including why it comes in sudden attacks, why it usually starts in the foot, and why diet alone rarely fixes it.
Where urate comes from in the first place
Every cell in your body contains purines — two of the four letters of DNA and RNA are purine bases, and the energy currency ATP is built on one. When cells are replaced, repaired or broken down, those purines are dismantled. The final step of that dismantling produces urate, which then has to leave the body.
That gives you two taps and one drain. The first tap is internal turnover — your own cells recycling themselves, which runs constantly and accounts for most of your daily urate load. The second is dietary purines. The drain is excretion: roughly two-thirds through the kidneys, roughly one-third through the gut, handled largely by a transporter called ABCG2.
Most people with gout do not overproduce urate. They underexcrete it. The kidney reabsorbs a large proportion of the urate it filters, and how efficiently it does that is set mainly by genes coding for urate transporters — SLC2A9, ABCG2 and others. Two people can eat identically and sit two milligrams per decilitre apart because of the plumbing they inherited. That is the single most important thing to grasp, and the thing the folklore around gout gets most wrong.
Humans are missing an enzyme
Most mammals have an enzyme called uricase that converts urate into allantoin, which is far more soluble and disappears harmlessly in urine. Somewhere in primate evolution the uricase gene broke and was never repaired. A dog runs a urate level a fraction of ours. We do not.
The result is that normal human urate sits uncomfortably close to the point where it stops dissolving. There may have been an evolutionary trade-off, since urate is an antioxidant — but the practical consequence today is that a species-wide quirk leaves a large minority of people living near a chemical cliff edge.
The saturation point is the whole story
Urate dissolves in body fluid up to roughly 6.8 mg/dL (about 405 µmol/L) at normal body temperature. Above that, the fluid is supersaturated and crystals can form, the way sugar stirred into iced tea eventually stops disappearing and settles at the bottom of the glass.
This is why treatment targets are set where they are. Guidelines aim for a serum urate below 6 mg/dL (360 µmol/L), and below 5 mg/dL (300 µmol/L) where visible urate deposits called tophi are present. Those are not arbitrary round numbers — they sit deliberately under the saturation point, so that existing crystal deposits slowly dissolve back into solution instead of growing. Our guide to the uric acid target that actually matters goes into why the number on your lab report is a different thing from the number your treatment is aiming at.
Crystallisation is not instant. Plenty of people sit above the saturation point for years with nothing happening at all, a state called asymptomatic hyperuricaemia. High urate is necessary for gout, but not sufficient on its own.
Why the crystals pick cool, peripheral joints
Solubility falls as temperature falls. Your core runs at around 37°C, but the big toe at the end of a cold bed at three in the morning can be several degrees cooler, and urate that was comfortably dissolved in your bloodstream is not necessarily dissolved there.
Add mechanical stress. The first joint of the big toe takes enormous load with every step and has accumulated decades of micro-trauma, which produces damaged cartilage surfaces that crystals can nucleate on. That combination — cool plus worked hard — is why the big toe is the classic first site, followed by the midfoot, ankle, knee, fingers and elbow bursa.
The pain is an immune response
Urate crystals sitting quietly in a joint cause no symptoms. An attack begins when crystals are shed into the joint fluid and encountered by resident immune cells. The crystal surface activates something called the NLRP3 inflammasome inside those cells, which releases interleukin-1 beta, which recruits neutrophils in enormous numbers.
What follows is one of the most violent inflammatory responses the body produces outside of infection: heat, swelling, redness and pain out of all proportion to the size of the joint. People routinely describe being unable to tolerate a bedsheet resting on the foot. It peaks within twelve to twenty-four hours and, untreated, settles over one to two weeks — we cover what a first attack actually feels like separately.
This also explains the drugs. Colchicine, NSAIDs and steroids all target the inflammatory response, which is why they help an attack but do nothing about the underlying urate level. Allopurinol and febuxostat do the opposite — they lower urate over months and do nothing for the pain today.
The one thing worth taking away: gout has two separate problems running on two separate clocks — the inflammation of today’s attack, and the urate level driving the whole disease. Treating only the first is why so many people have gout for twenty years.
Retiring the “disease of kings”
The old caricature is a wealthy man in a wingback chair with a bandaged foot and a decanter of port beside him. It is a bad model. Gout is the most common inflammatory arthritis in adults, it is strongly heritable, and it is far more closely tied to kidney function, blood pressure, body weight and sleep apnoea than to elaborate dinners.
Diet matters — it is simply not the lead actor. Whole-diet change typically moves serum urate by somewhere in the range of 0.3 to 1.3 mg/dL. That is a real effect and worth having, especially since the two biggest levers, weight loss and cutting alcohol, improve several other things at once. But if your urate is 9 mg/dL and your target is under 6, diet will not get you there on its own, and being told otherwise has kept a lot of people in avoidable pain.
Medication is another hidden contributor. Thiazide and loop diuretics, low-dose aspirin, ciclosporin and tacrolimus all raise urate — a conversation to have with your prescriber, never a reason to stop a tablet on your own.
Frequently Asked Questions
Can gout be cured?
No, but it can be controlled extremely well — often to zero attacks. Sustained urate-lowering therapy that keeps the level below target gradually dissolves the crystal deposits already in your joints. Once the deposits are gone, there is nothing left to trigger attacks, though the underlying tendency to run high urate remains and treatment usually continues indefinitely.
Is gout caused by eating too much red meat?
Red meat and shellfish contribute, but they are a modest part of a much bigger picture dominated by how efficiently your kidneys excrete urate. High-purine vegetables such as spinach, asparagus and beans do not appear to raise gout risk the way animal purines do.
Does a normal uric acid blood test rule gout out?
It does not. Serum urate often falls to normal or even low levels during an acute attack, so a test taken in the middle of a flare can be misleading. The definitive test is aspirating fluid from the joint and finding urate crystals under polarised light.
Can women get gout?
Yes. Oestrogen is uricosuric, meaning it helps the kidney dump urate, so gout is uncommon in women before menopause and then becomes considerably more common after it. Women are often diagnosed late because gout is assumed to be a male problem.
What to read next
- The four stages of gout — and why the quiet stage between attacks is the one that matters
- How gout is diagnosed, including the test that is under-used
- What actually raises uric acid, ranked honestly
- What happens if gout goes untreated over a decade
