Gout is a form 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 big toe. Around 55.8 million people worldwide had gout in 2020, and it affects men roughly three times more often than women.
How Uric Acid Crystals Form
Your body produces uric acid as a waste product when it breaks 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 blood contains more uric acid than your body can clear.
The threshold matters: uric acid becomes saturated in the blood at concentrations above 6.8 mg/dL. Beyond that point, it can combine with sodium to form needle-shaped crystals called monosodium urate (MSU). These crystals tend to settle in the fluid-filled spaces around joints, where they trigger a fierce immune response. Your body treats the crystals as foreign invaders, flooding the area with inflammatory cells. That’s what produces the sudden, dramatic pain of a gout attack.
Temperature plays a role in where crystals form. A drop of just 2°C lowers the saturation point of uric acid significantly, which helps explain why gout so often strikes the big toe and other extremities. These areas are farther from your core and run cooler than the rest of your body. Acidic conditions and physical impact on a joint can also trigger crystal formation, which is why an injury or a long day on your feet sometimes precedes a flare.
What a Gout Attack Feels Like
A gout flare typically arrives without warning, often in the middle of the night. The affected joint becomes intensely painful, swollen, red, and warm to the touch. Many people describe the pain as so severe that even the weight of a bedsheet is unbearable. The big toe is the classic location (historically called podagra), but gout can also hit the ankle, knee, wrist, or fingers.
An attack can last anywhere from a few days to a few weeks. Even without treatment, the pain eventually subsides on its own, but treatment shortens the episode and reduces its severity. Between flares, you may feel completely normal, a stage doctors call intercritical gout. These symptom-free gaps can last months or even years early on, but without management, attacks tend to become more frequent and involve more joints over time.
Who Gets Gout and Why
Several factors raise your risk, and most of them connect back to how much uric acid your body produces or how efficiently your kidneys remove it.
- Diet. Foods high in purines increase uric acid production. Fish with purine content above 200 mg per 100 grams, poultry, organ meats, and red meat are the primary culprits. Sugar intake also raises uric acid levels, particularly fructose found in sweetened beverages. Alcohol is another well-established trigger; frequent drinking increases gout risk by over 40% in some analyses.
- Genetics. Your genes influence how your kidneys handle uric acid. Proteins that transport uric acid out of the body, including one called ABCG2, vary in effectiveness from person to person. A family history of gout raises your likelihood substantially.
- Sex and age. Men develop gout far more often than women, in part because estrogen helps the kidneys excrete uric acid. Women’s risk rises after menopause as estrogen levels drop. The condition becomes more common with age in both sexes.
- Other health conditions. Kidney disease, high blood pressure, obesity, and metabolic syndrome all increase uric acid levels or reduce your body’s ability to clear it. Hyperuricemia, the precursor to gout, affects more than 20% of adults in developed countries like the United States.
The Four Stages of Gout
Gout doesn’t just appear fully formed. It progresses through distinct phases, and understanding where you are helps guide what to do about it.
In the first stage, uric acid levels are elevated but you have no symptoms. This is asymptomatic hyperuricemia. Crystals may already be forming, but they haven’t yet triggered inflammation. The second stage is the first acute flare, the sudden, painful attack described above. The third stage is intercritical gout, the quiet period between attacks when you feel fine but crystals remain in your joints. The fourth and most advanced stage is chronic tophaceous gout, where years of crystal buildup create visible lumps called tophi under the skin and cause ongoing joint damage.
Long-Term Complications
Left untreated, gout does more than cause painful episodes. Chronic uric acid buildup can lead to permanent joint erosion and deformity. Tophi, those hard deposits of crystallized uric acid, can form around joints and in soft tissue, sometimes breaking through the skin.
Kidney stones are another significant concern. About 14% of people with gout develop kidney stones, and a meta-analysis in Arthritis Research & Therapy found that gout nearly doubles the odds of kidney stone formation compared to the general population. Gout also carries a strong association with chronic kidney disease: people with gout have roughly 2.4 times the odds of developing kidney problems, likely because the same mechanisms that allow uric acid to build up in joints also burden the kidneys over time.
How Gout Is Diagnosed
A doctor can often suspect gout based on the classic presentation: sudden, excruciating pain in a single joint, especially the big toe. But confirming the diagnosis requires more than symptoms alone, because other conditions can mimic it.
The gold standard is joint fluid analysis. A needle is used to draw a small sample of fluid from the affected joint, which is then examined under a polarized light microscope. Gout crystals appear as needle-shaped and negatively birefringent (they glow a specific color under polarized light). This distinguishes them from the crystals seen in pseudogout, a similar condition caused by calcium pyrophosphate crystals, which are rhomboid-shaped and positively birefringent. Blood tests measuring uric acid are helpful but not definitive on their own. Uric acid levels can actually be normal during an acute flare, and many people with high uric acid never develop gout.
Treatment During a Flare
The goal during an acute attack is to reduce inflammation and pain as quickly as possible. Anti-inflammatory medications are the first line of treatment, and they work best when started within the first 24 hours of a flare. Your doctor may recommend a nonsteroidal anti-inflammatory drug (NSAID), colchicine (a medication that specifically targets the inflammatory pathway crystals activate), or a corticosteroid if the other options aren’t suitable.
Ice, elevation, and rest also help during a flare. Most treated attacks improve significantly within a few days.
Lowering Uric Acid Long Term
Treating individual flares doesn’t address the underlying problem. For people with recurrent attacks, the goal is to lower blood uric acid below 6 mg/dL, well under the 6.8 mg/dL saturation threshold. Some guidelines recommend getting below 5 mg/dL for patients with tophi, which helps dissolve existing crystal deposits over time.
Urate-lowering therapy is the cornerstone of long-term management. These medications work either by reducing the amount of uric acid your body produces or by helping your kidneys excrete more of it. Starting this therapy can paradoxically trigger flares at first as stored crystals begin to dissolve, so doctors often prescribe a low-dose anti-inflammatory alongside it for the first several months.
Lifestyle changes make a meaningful difference, though they rarely lower uric acid enough on their own. Reducing intake of high-purine foods, cutting back on alcohol (especially beer, which is high in purines), limiting sugary drinks, staying well hydrated, and maintaining a healthy weight all help. Losing weight reduces uric acid production and eases the burden on your kidneys, addressing both sides of the equation at once.