Gout develops when uric acid builds up in your blood and forms sharp, needle-like crystals inside a joint. Your body produces uric acid every time it breaks down compounds called purines, which are found naturally in your cells and in many foods. When uric acid levels in the blood exceed about 6.8 mg/dL, the acid can no longer stay dissolved and begins crystallizing in joint tissue, triggering the intense pain and swelling of a gout flare.
How Uric Acid Builds Up
Purines are part of your body’s normal chemistry. Your cells contain them, and you consume them in food. When purines break down, an enzyme converts them first into a compound called hypoxanthine, then into xanthine, and finally into uric acid. This is a normal process that happens continuously. The uric acid travels through your bloodstream to your kidneys, which filter most of it out through urine.
Gout happens when this system falls out of balance in one of two ways: your body produces more uric acid than your kidneys can handle, or your kidneys lose some of their ability to flush it out. In most people with gout, the problem is excretion. The uric acid backs up in the blood, and once it crosses that 6.8 mg/dL threshold, crystals can start forming in joints and surrounding tissue.
Why It Hits the Big Toe First
About half of first gout attacks strike the base of the big toe, and the reason comes down to physics. During the day, small amounts of fluid naturally collect in the joint at the base of the toe. At night, when you lie down and elevate your feet, that fluid drains back into surrounding tissues. But uric acid moves through tissue at less than half the speed of water, so as the water drains away, the uric acid concentration in the joint spikes. On top of that, your feet are the coolest part of your body, and lower temperatures make uric acid less soluble. The combination of concentrated uric acid and cool temperatures creates ideal conditions for crystal formation. This is why gout attacks so often wake people up in the middle of the night.
The same temperature principle explains why crystals also tend to form in other cooler, less blood-rich areas: the outer rim of the ear, the elbows, and the tendons of the hands and feet.
Foods That Raise Uric Acid
Certain foods are packed with purines and directly increase the amount of uric acid your body has to process. The biggest offenders are organ meats (liver, kidneys, sweetbreads, and brains) and certain seafood, including herring, scallops, mussels, tuna, trout, and haddock. Red meats like beef, lamb, pork, and bacon are moderately high in purines, as are game meats like venison and veal. Turkey, despite being leaner, is also high in purines.
Vegetables that contain purines, like asparagus and spinach, have not been shown to affect gout symptoms. The difference likely comes down to the type of purines and how they’re absorbed, so you don’t need to avoid vegetables to manage your risk.
Alcohol and Sugary Drinks
Beer is one of the strongest dietary triggers for gout because it delivers a double hit: it’s rich in purines from brewer’s yeast, and alcohol itself interferes with your kidneys’ ability to clear uric acid. Spirits raise risk too, though somewhat less than beer. Wine appears to have a weaker association, but heavy consumption of any alcohol increases your likelihood of a flare.
Sugary drinks are a less obvious but significant contributor. Fructose, the sugar found in sodas, fruit juices, and anything sweetened with high-fructose corn syrup, raises uric acid through a unique pathway. When your liver processes fructose, it burns through a large amount of cellular energy (ATP) very quickly. The leftover molecular fragments feed directly into purine production, generating more uric acid. Fructose also promotes insulin resistance over time, which further reduces your kidneys’ ability to excrete uric acid. This creates a cycle where sugary drink consumption keeps pushing levels higher from two directions at once.
Health Conditions That Increase Risk
Chronic kidney disease is one of the strongest risk factors for gout because damaged kidneys simply can’t filter out uric acid efficiently. Uric acid crystals deposited in kidney tissue also reduce blood flow within the kidneys themselves, which can worsen kidney function and create a feedback loop.
Insulin resistance and metabolic syndrome raise risk through a different mechanism. When your cells become resistant to insulin, the kidneys respond by reabsorbing more uric acid back into the bloodstream instead of letting it pass into urine. This is why gout so often appears alongside type 2 diabetes, obesity, and high blood pressure. These conditions cluster together, and each one makes the others worse.
Medications That Raise Uric Acid
Some commonly prescribed medications can push your uric acid levels up as a side effect. Diuretics (water pills), frequently prescribed for high blood pressure and heart failure, reduce the volume of fluid your kidneys process and concentrate uric acid in the blood. Low-dose aspirin, the kind many people take daily for heart protection, also interferes with uric acid excretion. Doses at or below 325 mg per day fall within the range that causes the kidneys to hold onto uric acid rather than flush it out. One study found that taking low-dose aspirin on two consecutive days increased the odds of a gout attack by 81% compared to not taking aspirin. If you take either of these medications and have a history of elevated uric acid, that’s a conversation worth having with your doctor.
Who Gets Gout
Men develop gout about three times more often than women across all age groups. Estrogen appears to help the kidneys excrete uric acid, which is why gout in women is rare before menopause and becomes more common afterward. The risk rises with age in both sexes, partly because uric acid accumulates over time, kidney function gradually declines, and the use of medications that raise uric acid (like diuretics) becomes more common.
Genetics also play a meaningful role. Variations in the genes that control uric acid transport in the kidneys can make some people far less efficient at clearing uric acid, regardless of diet. If gout runs in your family, you’re starting from a higher baseline of risk.
How Gout Progresses Over Time
Gout doesn’t start with a painful attack. It moves through four stages, and the first one is completely silent. During the asymptomatic phase, uric acid levels are elevated but no crystals have formed, or at least none that trigger inflammation. This stage can last years, even decades. Many people with high uric acid never progress beyond it.
The second stage is the first acute attack: sudden, severe pain and swelling in a joint, typically reaching peak intensity within 12 to 24 hours. After the attack resolves, you enter the intercritical period, the gap between flares. Early on, these gaps can last months or years, and the joint feels completely normal in between. But without treatment, attacks tend to become more frequent, affect more joints, and last longer.
The final stage is chronic tophaceous gout, where uric acid crystals accumulate into visible lumps called tophi under the skin and around joints. These can erode bone and permanently damage joints. The average time from a first gout attack to tophaceous disease is about 12 years, though it can range anywhere from 3 to 42 years. This progression is not inevitable. Keeping uric acid levels below 6 mg/dL, the current therapeutic target, can dissolve existing crystals and prevent new ones from forming.