Uric acid crystals in your joints are what cause gout attacks
Gout happens when uric acid — a waste product your body makes when it breaks down purines — builds up in your blood and forms needle-shaped crystals in your joints. Your immune system treats these crystals as invaders, triggering sudden inflammation, pain, redness, and swelling. This is why gout attacks come on fast and hurt intensely, usually in the big toe but sometimes in ankles, knees, wrists, or fingers.
The real question is not what causes gout in the moment of an attack, but why uric acid accumulates in the first place. That depends on two things: how much uric acid your body produces, and how well your kidneys filter it out. Most people with gout have kidneys that do not clear uric acid efficiently — even if they produce a normal amount. A smaller group produces too much uric acid for their kidneys to handle.
Key Takeaways
- Gout attacks happen when uric acid crystals form in joints and trigger inflammation, but the underlying cause is usually that your kidneys do not filter uric acid well enough.
- Diet — especially foods high in purines like red meat, organ meats, and certain seafood — raises uric acid levels, but diet alone rarely causes gout in people with normal kidney function.
- Genetics play a major role: if your parents or siblings have gout, your risk is significantly higher because kidney function and uric acid metabolism run in families.
- Certain medications, dehydration, rapid weight loss, and alcohol (especially beer) can trigger attacks or raise uric acid levels in people already at risk.
Why your kidneys matter more than your diet
Your kidneys filter about two-thirds of the uric acid your body produces each day. If your kidneys are less efficient at this job — whether because of how you were born, age, high blood pressure, or chronic kidney disease — uric acid stays in your blood longer and is more likely to crystallize in joints.
This is why two people can eat identical diets and only one gets gout. A person with efficient kidneys can handle a high-purine meal without problems. Someone whose kidneys clear uric acid slowly may develop gout even on a moderate diet. This is also why gout often runs in families: kidney function and how your body handles uric acid are partly inherited traits.
Research shows that about 90 percent of people with gout have reduced kidney clearance of uric acid, not overproduction. This matters because it means diet changes alone will not prevent gout in most people — though they can help reduce attacks once you know your triggers.
Foods and drinks that raise uric acid levels
Purines are compounds found in many foods, and your body converts them to uric acid when it digests them. Foods highest in purines include red meat, organ meats (liver, kidney), certain seafood (anchovies, sardines, shellfish), and yeast-based products. Beer is particularly problematic because it contains purines and also slows kidney clearance of uric acid.
High-fructose foods and drinks — including regular soda, fruit juice, and foods with added sugar — also raise uric acid levels, even though they do not contain purines. Fructose appears to increase uric acid production in the liver. Alcohol other than beer can trigger attacks too, though the effect is less direct than with beer.
If you have gout, avoiding or limiting these foods may reduce how often attacks happen, but it will not eliminate them unless you also address the underlying kidney clearance problem. That is why doctors often prescribe uric acid-lowering medications alongside dietary changes.
Genetic factors you cannot change
Your genes influence how efficiently your kidneys filter uric acid and how much your body produces. If one or both parents have gout, your risk is much higher — studies suggest a genetic component in 60 to 80 percent of gout cases. This does not mean you will definitely develop gout, but it means your body is predisposed to accumulate uric acid.
Age and sex also matter. Gout is more common in men, particularly after age 40, and in women after menopause. Men produce more uric acid on average, and estrogen in women helps kidneys clear uric acid more efficiently — which is why premenopausal women rarely get gout.
Medications and conditions that trigger gout
Certain medications raise uric acid or interfere with kidney clearance. Diuretics (water pills) used for high blood pressure are a common culprit. Low-dose aspirin, which many people take for heart health, can also raise uric acid levels. Chemotherapy drugs used in cancer treatment sometimes cause gout because they break down tumor cells and release large amounts of purines into the bloodstream.
Conditions that damage kidneys — chronic kidney disease, high blood pressure, diabetes — make gout more likely because they reduce uric acid clearance. Metabolic syndrome, obesity, and insulin resistance are also linked to higher gout risk. Rapid weight loss, even intentional weight loss through dieting, can trigger attacks because it causes the body to break down tissue and release purines.
Dehydration and acute triggers
Dehydration concentrates uric acid in your blood and makes crystallization more likely. This is why gout attacks sometimes follow illness with fever or vomiting, intense exercise without enough fluid, or simply not drinking enough water. Sudden temperature changes in joints — like putting a foot in cold water — can also trigger an attack in someone whose uric acid is already high.
Stress and lack of sleep do not directly raise uric acid, but they may trigger attacks in people who are already at risk, possibly through effects on inflammation or kidney function.
What happens after your first attack
A single gout attack does not mean you will have another one soon. Some people have one attack and then none for years. Others have clusters of attacks weeks or months apart. Once uric acid levels stay high enough, attacks become more frequent and may eventually happen in multiple joints.
If you have had one attack, your uric acid level is worth checking. A blood test shows whether your uric acid is elevated. If it is, your doctor may recommend uric acid-lowering medication even if you have not had a second attack, because keeping levels low prevents future attacks and protects your joints from long-term damage.
Frequently Asked Questions
Can you get gout if you eat healthy and exercise?
Yes. If your kidneys do not clear uric acid efficiently — which is genetic — you can develop gout regardless of diet or fitness. Diet and exercise matter for managing gout once you have it, but they cannot override a genetic predisposition to poor uric acid clearance.
Does drinking water prevent gout attacks?
Staying hydrated helps keep uric acid diluted in your blood and supports kidney function, so it may reduce attack frequency. But water alone will not prevent gout if your uric acid level is chronically high. It is one piece of management, not a complete solution.
Why did I get gout suddenly if no one in my family has it?
Gout can appear without a known family history because genetic traits skip generations or because relatives had gout but it was never diagnosed. It can also develop later in life due to age-related changes in kidney function, medications you started taking, or conditions like high blood pressure or diabetes that developed over time.
Is gout caused by too much meat, or is it something else?
Meat raises uric acid, but it is not the root cause of gout. Most people who eat meat do not get gout. The root cause is usually inefficient kidney clearance of uric acid — a trait you are born with or develop over time. Meat is a trigger for people already at risk, not the underlying problem.
Can you have high uric acid without getting gout?
Yes. Many people have elevated uric acid levels but never develop gout because the uric acid does not crystallize in their joints. Whether crystals form depends on factors like joint temperature, pH, and the presence of other substances in the fluid around joints. This is why some people with very high uric acid never have an attack, while others with moderately high levels do.