Gout develops when uric acid builds up in your bloodstream and forms sharp, needle-like crystals inside a joint. This buildup happens through a combination of factors: your body producing too much uric acid, your kidneys not filtering enough of it out, or both. The foods you eat, the medications you take, your genetics, and how well your kidneys function all play a role in tipping that balance.
How Uric Acid Builds Up
Your body constantly breaks down substances called purines, which come from two sources: the foods you eat and your own cells as they naturally turn over. An enzyme called xanthine oxidase handles the final steps of this breakdown, converting purines first into an intermediate compound and then into uric acid. In most people, this uric acid dissolves in the blood, travels to the kidneys, and leaves the body through urine.
Problems start when uric acid levels in the blood rise above roughly 6 mg/dL. At that concentration, uric acid reaches its saturation point and can no longer stay dissolved. Instead, it begins to crystallize into tiny, sharp deposits of monosodium urate. These crystals settle in and around joints, triggering the intense inflammation that defines a gout attack. Not everyone with high uric acid gets gout, but the higher and longer your levels stay elevated, the more likely crystals are to form.
Your Kidneys Are the Most Common Bottleneck
The more common reason for high uric acid isn’t overproduction. It’s under-excretion. Your kidneys are responsible for adding uric acid to your urine so it can leave the body, and when they can’t keep up, uric acid accumulates in the blood. According to the National Kidney Foundation, reduced kidney excretion is the more frequent cause of the two. Chronic kidney disease makes this worse, creating a cycle where high uric acid can further damage the kidneys, and damaged kidneys can further raise uric acid.
Foods That Raise Uric Acid
Certain foods are packed with purines, and eating them regularly pushes your uric acid levels higher. The biggest offenders are organ meats like liver, kidney, and sweetbreads. These contain some of the highest purine concentrations of any food. Red meat (beef, lamb, and pork) also contributes, though to a lesser degree. Among seafood, anchovies, shellfish, sardines, and cod are particularly high in purines.
Fructose deserves its own mention because it raises uric acid through a completely different pathway than purine-rich foods. When your liver processes fructose, it uses up a molecule called ATP at an unusually fast rate. The leftover fragments of that spent ATP get broken down into uric acid. This means sugary drinks, fruit juices with added sugar, and foods sweetened with high-fructose corn syrup can spike your uric acid levels even though they contain no purines at all.
Why Alcohol Is a Major Trigger
Alcohol raises gout risk in multiple ways. It increases uric acid production while simultaneously making it harder for your kidneys to excrete it. Beer carries a particularly high risk because it contains purines from the brewing process on top of the alcohol itself. Spirits also raise risk, though typically less than beer. If you’re prone to gout, alcohol is one of the most controllable risk factors you have.
Medications That Can Cause Gout
Several common medications raise uric acid as a side effect. Diuretics, especially the thiazide type often prescribed for high blood pressure, are one of the most important causes of medication-related high uric acid. These drugs work by increasing urine output, but in the process they also increase uric acid reabsorption in the kidneys, sending more of it back into the bloodstream instead of out through urine. Low-dose aspirin can have a similar effect. If you’re taking a medication and developing gout symptoms, the drug itself could be a contributing factor worth discussing with whoever prescribed it.
Genetics Play a Larger Role Than Most People Realize
Your genes significantly influence how efficiently your body handles uric acid. Two genes in particular have been well studied. One, called SLC2A9, codes for a transport protein that moves uric acid in the kidneys. Certain variants of this gene are associated with higher uric acid levels and greater gout susceptibility across multiple populations.
The other, ABCG2, codes for a protein that sits on the surface of kidney cells, liver cells, and gut cells, where it actively pumps uric acid out of the body. One common variant of this gene reduces the protein’s expression by 30 to 50%, making it significantly less effective at clearing uric acid. People who carry this variant end up with higher baseline uric acid levels and a greater chance of developing gout, even without dietary triggers. This helps explain why some people eat carefully, drink little, and still get gout: their excretion machinery is genetically less efficient.
Who Gets Gout Most Often
Gout is far more common in men than women, particularly between the ages of 30 and 50. Women are partially protected by estrogen, which helps the kidneys excrete uric acid. After menopause, that protection fades, and women’s gout rates start to climb. Obesity is another strong risk factor because excess body weight increases uric acid production and reduces kidney excretion at the same time. Conditions like high blood pressure, diabetes, and metabolic syndrome all cluster with gout for overlapping metabolic reasons.
Where Gout Strikes
The classic location for a gout attack is the base of the big toe, a presentation so characteristic it has its own name: podagra. Urate crystals tend to form in cooler parts of the body, and the big toe, being the farthest point from your core, fits the bill. But gout can affect any joint. After the big toe, the most frequently involved sites are the feet, ankles, knees, and elbows. Attacks can also hit more than one joint at a time, especially as the condition progresses.
A first gout attack typically comes on fast, often overnight. You might go to bed feeling fine and wake up with a joint that’s swollen, red, hot to the touch, and exquisitely painful. Even the weight of a bedsheet can feel unbearable. Without treatment, an acute attack usually peaks within 12 to 24 hours and resolves on its own within one to two weeks. But the crystals remain in the joint between attacks, and over time, flares tend to become more frequent and involve more joints if the underlying uric acid level isn’t addressed.
The Difference Between High Uric Acid and Gout
Having elevated uric acid, a state called hyperuricemia, is not the same as having gout. Many people walk around with high uric acid for years and never have an attack. Gout is specifically the inflammatory response that happens when your immune system detects urate crystals in a joint and mounts an aggressive attack against them. The crystals themselves are the necessary ingredient, but your body’s inflammatory reaction is what produces the pain, swelling, and redness. This is why gout attacks can seem to come out of nowhere: the crystals may have been accumulating silently long before the first flare.