Gout is a form of inflammatory arthritis caused by a buildup of uric acid in your blood, which eventually forms sharp crystals inside your joints. It’s one of the most painful joint conditions, often striking suddenly in the middle of the night with intense swelling, redness, and pain, most commonly in the big toe. About 4% of American adults have it, and it’s both treatable and preventable once you understand what’s driving it.
How Uric Acid Becomes Joint Crystals
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 your blood, passes through your kidneys, and leaves your body in urine. Problems start when your body makes too much or your kidneys don’t filter enough out.
When uric acid levels in your blood exceed about 6.8 mg/dL, the acid reaches its physical solubility limit under normal body conditions. Above that threshold, it can start forming crystals of monosodium urate. But this doesn’t happen instantly or automatically. Research published in Communications Biology found that crystals don’t just appear out of nowhere in joint fluid. Instead, uric acid first settles as an amorphous (non-crystalline) precursor on damaged collagen fibers in joint cartilage. Over time, possibly years, this precursor slowly transforms into the needle-shaped crystals that trigger gout attacks. This explains why many people walk around with high uric acid for years before their first flare.
What a Gout Flare Feels Like
A gout attack typically hits fast. You might go to bed feeling fine and wake up at 2 a.m. with a joint that feels like it’s on fire. The big toe is the classic location, but gout can also strike your ankles, knees, wrists, fingers, and elbows. The affected joint becomes swollen, red, warm, and extraordinarily tender. Even the weight of a bedsheet can feel unbearable.
Flares usually peak within 12 to 24 hours and then gradually improve over one to two weeks. Between attacks, you typically feel completely normal. That gap between flares can create a false sense of security. Without treatment, the attacks tend to come back more frequently, last longer, and affect more joints over time.
Who Gets Gout and Why
Gout has a strong genetic component, but several other factors stack the risk. High blood pressure, chronic kidney disease, obesity, and metabolic syndrome all increase the likelihood. Kidney disease is especially relevant because your kidneys are the primary exit route for uric acid, so anything that impairs their function can cause levels to climb.
Certain medications are also major contributors. Diuretics (water pills), particularly the loop and thiazide types commonly prescribed for blood pressure and heart failure, reduce your kidneys’ ability to clear uric acid. Combining two types of diuretics can raise your gout risk by as much as five times. Other medications linked to higher uric acid include some blood pressure drugs like beta-blockers, low-dose aspirin, and immunosuppressant drugs often used after organ transplants.
Men are more prone to gout than women, partly because estrogen helps the kidneys excrete uric acid. After menopause, women’s risk rises to closer to men’s levels. Hyperuricemia is defined as uric acid above 7 mg/dL in men and above 6 mg/dL in women.
Foods and Drinks That Raise Uric Acid
Purines in food get broken down into uric acid, so what you eat directly affects your levels. The biggest dietary offenders include organ meats (liver, kidney, sweetbreads), red meat in large portions, and certain seafood like anchovies, sardines, shellfish, and codfish.
Alcohol is a well-established trigger, with beer being the worst because it contains purines of its own on top of the alcohol. Distilled spirits also raise risk, though to a lesser degree. Drinking during a flare is particularly likely to make things worse.
One trigger that surprises many people is sugar, specifically fructose. Fructose is the only carbohydrate that directly generates uric acid during its metabolism. When your liver processes fructose, it burns through a molecule called ATP so quickly that the breakdown products get converted into uric acid. This is why sugary drinks sweetened with high-fructose corn syrup are consistently linked to higher gout risk. The same applies to fruit juices, sweetened cereals, and other foods with added sugars.
How Gout Is Diagnosed
Doctors can often diagnose gout based on your symptoms, the joint involved, and a blood test showing elevated uric acid. But blood tests alone aren’t definitive. Some people have high uric acid and never develop gout, while uric acid levels can actually drop during an acute flare, making the reading misleadingly normal.
The gold standard is joint aspiration: a doctor uses a needle to draw fluid from the affected joint and examines it under a microscope for urate crystals. This is typically reserved for cases where the diagnosis is uncertain or an infection needs to be ruled out. If the joint is too small to aspirate, imaging can help. Ultrasound is more sensitive than plain X-rays at detecting crystal deposits, and a specialized scan called dual-energy CT is highly sensitive (about 95%) at identifying urate crystals throughout the body, though access to it remains limited.
Treating a Gout Flare
The goal during an acute attack is to reduce inflammation and pain as quickly as possible. Anti-inflammatory painkillers (NSAIDs) are the most common first-line option because they’re inexpensive, widely available, and effective when taken early. Colchicine, a medication that specifically targets gout inflammation, works well for short courses but carries a slightly higher chance of side effects like nausea and diarrhea. For people who can’t take either of those, corticosteroids taken by mouth or injected directly into the joint are an alternative.
Timing matters. Starting treatment within the first 24 hours of a flare makes a significant difference in how quickly the pain resolves. Stopping treatment too early, particularly with corticosteroids, can cause a rebound flare. Most doctors recommend continuing anti-inflammatory treatment for at least five days and tapering off gradually over two to three weeks if needed.
Long-Term Uric Acid Management
Treating flares addresses the symptom. Preventing them requires bringing uric acid levels down and keeping them there. The American College of Rheumatology recommends starting urate-lowering therapy if you have visible crystal deposits (tophi), evidence of joint damage on imaging, or two or more flares per year.
The most commonly prescribed medications work by blocking the enzyme your body uses to produce uric acid. Treatment typically starts at a low dose and increases gradually every two to four weeks until your uric acid drops below 6 mg/dL, the target recommended by both U.S. and European guidelines. For people with high cardiovascular risk, some experts recommend an even lower target of 5 mg/dL. This is a long-term commitment. Stopping the medication allows uric acid to climb back up, and flares return.
One counterintuitive aspect: starting urate-lowering therapy can actually trigger flares in the short term as crystals begin dissolving and shifting in the joint. This is why doctors often prescribe a low-dose anti-inflammatory alongside the new medication for the first several months.
What Happens if Gout Goes Untreated
Left unmanaged, gout progresses. The crystals don’t dissolve on their own. Over years, they accumulate into visible lumps called tophi, firm nodules that can range from pea-sized to as large as a tangerine. Tophi most commonly form in and around joints, including in cartilage, tendons, and bone, but they can also appear in unexpected places like the ears, the whites of the eyes, and even heart valves.
Tophi aren’t just cosmetic. They erode the tissues they grow in, including bone, and this damage is often irreversible. They can displace or block a joint, permanently limiting its range of motion. Advanced gout is also closely linked to kidney disease and kidney stones, since the same excess uric acid that crystallizes in joints can crystallize in the kidneys. People with uric acid levels above 9 mg/dL or more than three flares per year have significantly higher rates of kidney impairment, heart disease, and high cholesterol compared to those with lower levels.
The good news is that gout is one of the most manageable forms of arthritis when treated properly. Urate-lowering therapy can dissolve existing crystals, shrink tophi, and eliminate flares entirely. The key is sustained treatment rather than only addressing the pain when it shows up.