Uric acid, gout, and the joint that wakes you at three in the morning
A raised number on a report and an attack of gout are not the same thing, and the diet advice everyone gives accounts for less of it than people are told.
The classic presentation is unmistakable once heard. A joint — most often the base of the big toe — becomes exquisitely painful over a few hours, usually overnight, red and hot, and so tender that the weight of a bedsheet is intolerable. Then, over a week or two, it settles completely and the patient concludes it was nothing.
What urate is and why it crystallises
Uric acid is the end product of breaking down purines — compounds found in the body's own cells and in food. Normally it dissolves in blood and leaves through the kidneys. When the level exceeds what the blood can hold dissolved, it can form needle-shaped crystals, and when those settle in a joint the immune system attacks them. The pain is the inflammation, not the crystal.
Cooler joints crystallise more readily, which is why the foot and the big toe are the classic sites, and why attacks so often begin in the small hours.
The number and the disease
This is the distinction that changes management. A raised level with no attack and no stones is a risk marker to address through weight, diet and the conditions travelling with it. Recurrent gout, or urate stones, or crystal deposits in tissue, is a disease requiring treatment aimed at the level itself. Patients are routinely handed long-term tablets for the first situation, and left without them in the second.
What raises it
- Reduced kidney excretion — inherited in most people, and the largest single factor
- Central weight and insulin resistance, which reduce urate clearance
- Fructose, in sweetened drinks and in packaged food, which raises production directly
- Alcohol, beer especially
- Organ meat, red meat and some seafood
- Diuretics and low-dose aspirin, which reduce excretion
- Dehydration, and crash dieting or fasting, both of which can precipitate an attack
What an assessment covers
How many attacks, in which joints, and how long each lasted. Serum uric acid taken away from an attack, because the level can be deceptively normal during one. Kidney function, because it drives excretion and limits which treatments are safe. Blood sugar, lipids, blood pressure and waist, because this rarely arrives alone. And the full medicine list, including the painkillers that have been used for it.
Where the joint is not behaving like gout — several joints at once, no symptom-free gaps, morning stiffness lasting hours — the question becomes whether this is gout at all, and it is examined as such rather than treated as a uric acid problem.
A single hot, swollen, intensely painful joint with fever can be an infected joint rather than gout, and that is an emergency needing hospital assessment. Long-term NSAID use for recurrent attacks carries kidney risk and should be reviewed rather than continued indefinitely.
Questions people ask
- Does a high uric acid level mean I have gout?
- No. Many people have a raised level and never have an attack — that is called asymptomatic hyperuricaemia. Gout is the disease: crystals of urate forming in a joint and provoking sudden, severe inflammation. The number is a risk factor, not a diagnosis, and treating a number in someone who has never had an attack is generally not recommended.
- Which foods raise uric acid most?
- Organ meats, red meat, shellfish and certain fish, alcohol — beer in particular — and drinks and foods sweetened with fructose. Lentils and spinach contain purines but contribute far less than their reputation suggests. Diet is a genuine but modest contributor; how well the kidneys excrete urate matters more, and that is largely inherited.
- Is high uric acid linked to the kidneys and to diabetes?
- Yes, in both directions. The kidneys excrete most of the body's urate, so reduced kidney function raises the level. Raised urate also travels with insulin resistance, central weight, high blood pressure and fatty liver, which is why it frequently appears on the same report as those, and why it is read as part of a metabolic picture rather than on its own.