Gouty arthritis is a type of inflammatory arthritis caused by the buildup of uric acid crystals inside your joints. It produces sudden, intense episodes of pain, swelling, and redness, most often in the base of the big toe. Around 55.8 million people worldwide had gout in 2020, and that number is projected to reach nearly 96 million by 2050.
How Uric Acid Crystals Form in Joints
Your body produces uric acid as a byproduct of breaking down purines, compounds found naturally in your cells and in certain foods. Normally, uric acid dissolves in the blood, passes through the kidneys, and leaves the body in urine. When levels climb too high, uric acid combines with sodium to form tiny needle-shaped crystals that settle into joints and surrounding soft tissue.
Crystal formation doesn’t happen overnight. Uric acid has to exceed its saturation point in the blood, generally above 6.8 mg/dL, before crystals begin to precipitate. The initial step, called nucleation, is the slowest part of the process. Dissolved uric acid molecules cluster together, and once those clusters reach a critical size, the crystal grows rapidly along its length. This is why someone can have elevated uric acid for years before experiencing a first attack: the crystals need time to form and accumulate.
Once crystals are present, they trigger a powerful immune response. Immune cells in the joint lining detect the crystals, release inflammatory signaling molecules, and recruit waves of white blood cells into the joint. Those white blood cells are further activated by the crystals themselves, amplifying the inflammation. The result is the rapid onset of severe pain, heat, and swelling that defines an acute gout flare.
Who Gets Gout
Gout is roughly three times more common in men than in women, and prevalence rises with age. In the United States alone, an estimated 38 million people have elevated uric acid levels, though not all of them will develop gout. After menopause, women’s risk increases significantly because estrogen, which helps the kidneys excrete uric acid, declines. The overall global prevalence rose by about 22.5% between 1990 and 2020, driven largely by population growth and dietary changes.
What a Gout Flare Feels Like
A gout attack typically strikes without warning, often in the middle of the night. The joint becomes so tender that even the weight of a bedsheet can feel unbearable. The skin over the joint often turns red or purplish and feels warm to the touch. Flares peak within 12 to 24 hours and can last anywhere from a few days to two weeks if untreated.
The base of the big toe is the most frequently affected joint, accounting for 56% to 78% of cases. But gout can also hit the midfoot, ankle, knee, wrist, fingers, and elbow. Early in the disease, attacks tend to affect a single joint. Over time, flares may involve multiple joints simultaneously.
Common Triggers
More than one-third of gout patients can identify a specific trigger for their flares. The most frequently reported ones include red meat or seafood consumption, alcohol use, dehydration, physical injury or overexertion, and changes in weather or temperature.
Certain foods are particularly high in purines. Organ meats like liver, kidney, and thymus contain the highest purine levels of any food. Veal, chicken with skin, and lamb fall in the moderate-to-high range. Among seafood, anchovies, herring, mackerel, sardines, trout, and shellfish are notable contributors. Drinks sweetened with high-fructose corn syrup, including many soft drinks, also raise uric acid levels.
Alcohol deserves special mention because it raises uric acid through multiple pathways. Beer is particularly problematic since it contains purines of its own. Some medications can trigger flares too. Diuretics, commonly prescribed for high blood pressure, increased the risk of a flare by 3.6 times in the two days following their use. Paradoxically, starting uric acid-lowering medication can also provoke flares in the short term as crystal deposits begin to dissolve, which is why doctors typically prescribe anti-inflammatory protection during the early months of treatment.
How Gout Is Diagnosed
The gold standard for diagnosing gout is joint aspiration: drawing fluid from the swollen joint and examining it under a polarized microscope for the characteristic needle-shaped crystals. This test is definitive when positive, but it has limitations. In about 25% of acute cases, the aspirate comes back negative. Sometimes the joint is too small or difficult to access for a needle.
When aspiration isn’t practical, a specialized imaging technique called dual-energy CT can identify uric acid crystal deposits throughout the body. A meta-analysis of 11 studies found this scan has a sensitivity of about 87% and specificity of 84% compared to crystal identification under a microscope. It is especially useful for detecting crystal deposits in tendons, bursae, and other tissues outside the joint space, where a standard aspiration would miss them entirely.
Blood tests measuring uric acid levels provide supporting evidence but aren’t sufficient for diagnosis on their own. Hyperuricemia is generally defined as levels above 7 mg/dL in men and 6 mg/dL in women. However, some people with gout have normal uric acid readings during an acute flare, and many people with high uric acid never develop gout.
Treating an Acute Flare
The priority during a gout attack is reducing inflammation and pain as quickly as possible. Treatment works best when started within the first hours of symptoms. The three main options are anti-inflammatory medications, corticosteroids, and colchicine, a plant-derived drug that specifically targets the inflammatory pathway gout activates. Your doctor will choose based on your other health conditions, particularly kidney function and stomach sensitivity.
Ice, elevation, and rest also help during a flare. Most treated attacks resolve within a few days, though residual soreness can linger for a week or more.
Long-Term Uric Acid Management
Treating flares alone doesn’t address the underlying problem. If you have frequent attacks, visible crystal deposits (called tophi) under the skin, or joint damage on X-rays, you’ll likely need daily medication to lower uric acid levels permanently. The American College of Rheumatology recommends a treat-to-target approach: adjusting medication doses over time to bring your blood uric acid below 6 mg/dL and keep it there.
The first-choice medication works by blocking the enzyme that produces uric acid in the first place. It’s started at a low dose and gradually increased, with periodic blood tests to track progress. An alternative medication using a different chemical approach is more potent at lowering uric acid and may be used when the first option isn’t effective or isn’t tolerated. Research comparing the two has found no significant difference in cardiovascular mortality or overall death rates between them, which had been an early concern with the newer drug.
Staying on medication consistently is essential. When uric acid drops below 6 mg/dL and remains there, existing crystal deposits slowly dissolve. Over months to years, flares become less frequent and eventually stop. Tophi shrink and can disappear entirely. Stopping medication, even after years of good control, allows crystals to reform.
What Happens If Gout Goes Untreated
Without treatment, gout tends to progress through a predictable pattern. Early on, you might have a single flare followed by months or years of no symptoms. Over time, the intervals between attacks shorten, more joints become involved, and flares last longer.
Eventually, chronic deposits of uric acid crystals form visible lumps called tophi beneath the skin. These chalky, whitish nodules commonly appear around the fingers, elbows, ears, and toes. Tophi aren’t just cosmetic. They can erode into bone and cartilage, causing permanent joint damage visible on X-rays as characteristic overhanging edges of bone. Chronic untreated gout can progress to a polyarticular form, meaning multiple joints are affected simultaneously and continuously, leading to significant disability.
Persistently high uric acid also stresses the kidneys. Uric acid crystals can deposit in kidney tissue and form kidney stones, which occur at higher rates in people with gout than in the general population.
Dietary and Lifestyle Changes
Diet alone rarely lowers uric acid enough to replace medication in someone with established gout, but it plays a meaningful supporting role. Limiting high-purine foods, particularly organ meats, certain seafood, and red meat, reduces the raw material your body uses to produce uric acid. Cutting back on alcohol, especially beer, removes a significant trigger. Replacing sugary drinks with water helps both by reducing fructose intake and by keeping you well hydrated, which supports uric acid excretion through the kidneys.
Maintaining a healthy weight matters because excess body fat increases uric acid production and decreases the kidneys’ ability to clear it. Losing weight gradually is important; crash dieting can temporarily spike uric acid and trigger a flare. Dairy products, particularly low-fat options, have been associated with lower uric acid levels and may be a useful protein source to substitute for red meat.