Gout is a type of arthritis caused by uric acid crystals forming in your joints
Gout happens when uric acid—a waste product your body makes when it breaks down purines (compounds found in certain foods and your own cells)—builds up in your blood and forms needle-shaped crystals in your joints. These crystals trigger an intense inflammatory response: your immune system treats them as a threat, flooding the joint with white blood cells and inflammatory chemicals. The result is sudden, severe pain, swelling, redness, and warmth, usually in the big toe but sometimes in ankles, knees, wrists, or fingers.
Gout differs from other types of arthritis because the attacks come on fast—often within hours—and can be disabling for days or weeks. Between attacks, you may feel completely normal. This pattern of sudden flares separated by symptom-free periods is what makes gout distinctive. The condition is also different from osteoarthritis (wear-and-tear damage) or rheumatoid arthritis (an autoimmune disease), though all three are forms of arthritis.
Key Takeaways
- Gout occurs when uric acid crystals form inside a joint, triggering sudden inflammation and severe pain that typically lasts days to weeks.
- Your body produces uric acid when it breaks down purines, which come from certain foods (red meat, organ meats, seafood, alcohol) and from your own cells.
- Some people's kidneys do not filter uric acid efficiently, making them more likely to develop gout even if they eat normally.
- Gout can be managed with medication during attacks and with long-term drugs that lower uric acid levels to prevent future flares.
Why uric acid builds up in your blood
Your body produces uric acid constantly as cells break down and as you digest foods high in purines. Normally, your kidneys filter most of it out through urine. But in people who develop gout, one of two things happens: either the body produces too much uric acid, or the kidneys do not filter it out efficiently enough. When uric acid levels stay high over time, crystals can form.
Several factors make high uric acid more likely. Men are more prone to gout than women, especially before women reach menopause. A family history of gout increases your risk. Certain medical conditions—kidney disease, high blood pressure, heart disease, and metabolic syndrome—raise uric acid levels. Some medications, including diuretics (water pills) and low-dose aspirin, can interfere with uric acid removal. Obesity and weight gain also increase risk, as does heavy alcohol consumption, particularly beer.
Diet plays a role but is not the whole story. Foods high in purines—red meat, organ meats like liver, certain seafood (anchovies, sardines, shellfish), and high-fructose corn syrup—can raise uric acid. Alcohol, especially beer, does the same. But many people who eat these foods never develop gout, while some people with gout eat a normal diet. This is why genetics and kidney function matter as much as what you eat.
How a gout attack develops and what it feels like
A gout attack usually starts without warning. You may go to bed feeling fine and wake up with your big toe throbbing, or pain may strike during the day. The affected joint becomes red, swollen, and hot to the touch within hours. The pain is often described as severe—some people say it feels like the joint is on fire or being crushed. Even the weight of a bedsheet can be unbearable.
The attack typically peaks within 24 to 48 hours, then gradually improves over several days to a week or two. Some people have only one attack in their lifetime. Others have a second attack months or years later. But if uric acid levels stay high, attacks often become more frequent, last longer, and may affect multiple joints. Over time, repeated attacks can cause permanent joint damage and the formation of tophi—deposits of uric acid crystals that appear as lumps under the skin.
What triggers an individual attack is not always clear, but common precipitants include a sudden increase in purine intake (a large meal of red meat or seafood), dehydration, surgery or illness, starting a new medication, or rapid weight loss. Some people notice attacks happen after drinking alcohol or eating foods they know are high in purines, while others cannot identify a clear trigger.
The difference between acute gout and chronic gout
Acute gout refers to a single attack—the sudden inflammation and pain that comes on fast and resolves within days to weeks. During an acute attack, the goal is to reduce pain and inflammation as quickly as possible, usually with anti-inflammatory medications like indomethacin, naproxen, or colchicine, or sometimes with corticosteroids.
Chronic gout means you have had multiple attacks or your uric acid level stays persistently high. In chronic gout, the focus shifts to long-term management: taking medications that lower uric acid production (like allopurinol or febuxostat) or increase uric acid excretion (like probenecid) to keep levels low enough that crystals do not form. The goal is to prevent future attacks altogether, not just treat them when they happen.
Some people experience what is called intercritical gout—the period between attacks when you have no symptoms, even though uric acid may still be high. This symptom-free time can be misleading: damage to the joint may still be occurring, which is why doctors often recommend starting uric acid-lowering therapy even during periods without pain.
How gout is diagnosed
Gout is diagnosed by finding uric acid crystals in fluid drawn from the affected joint. During an acute attack, a doctor uses a needle to withdraw a small amount of fluid from the joint (a procedure called arthrocentesis) and examines it under a microscope. The crystals have a distinctive needle shape and are negatively birefringent—they look a certain way under polarized light that confirms they are uric acid crystals, not crystals from other conditions.
A blood test showing high uric acid supports the diagnosis but is not enough on its own, because some people with high uric acid never develop gout, and some people with gout have normal uric acid levels at the moment of testing (uric acid can drop during an acute attack). X-rays or ultrasound may show joint damage if gout has been present for years, but these are not used to diagnose an initial attack.
If you have symptoms of gout but cannot see a doctor during an attack, a detailed description of the pain, swelling, and timing can help. Gout has a recognizable pattern—sudden onset, severe pain in one joint (often the big toe), redness and warmth, and improvement over days to weeks—that distinguishes it from other joint problems.
Long-term effects of untreated or poorly managed gout
If gout is not treated or if uric acid stays high over many years, permanent damage can occur. Repeated crystal formation erodes the cartilage and bone inside the joint, leading to chronic pain and reduced movement even between attacks. Tophi—lumps of uric acid crystals—can form under the skin, in the ears, or in other tissues. These deposits can damage surrounding tissue and may eventually break through the skin.
Chronic gout also increases the risk of kidney stones, because uric acid crystals can form in the urinary tract. People with gout have higher rates of kidney disease overall, though it is unclear whether gout itself causes kidney damage or whether the same factors that lead to gout (like high blood pressure and obesity) also damage the kidneys.
The good news is that these long-term complications are largely preventable with treatment. Keeping uric acid levels low through medication prevents new crystal formation and allows existing deposits to gradually dissolve. Most people who take uric acid-lowering medication as prescribed can avoid permanent joint damage and live without frequent attacks.
Frequently Asked Questions
Is gout the same as arthritis?
Gout is a type of arthritis—specifically, it is an inflammatory arthritis caused by uric acid crystals. But not all arthritis is gout. Osteoarthritis comes from wear and tear on joints over time. Rheumatoid arthritis is an autoimmune disease. Gout is different because it is caused by a specific crystal that forms when uric acid is high.
Can you have gout without high uric acid?
Rarely. Most people with gout have high uric acid levels. However, uric acid can drop during an acute attack, so a blood test taken during pain may show a normal level. If gout is suspected, the diagnosis is confirmed by finding crystals in joint fluid, not by a single uric acid blood test.
Does gout only affect the big toe?
The big toe is the most common site, but gout can affect any joint. Ankles, knees, wrists, fingers, and elbows are all possible. Some people have attacks in multiple joints at once. The big toe is affected most often because it is cooler than other parts of the body, and uric acid crystals form more easily in cooler areas.
Can you prevent gout attacks by avoiding certain foods?
Diet changes can help reduce uric acid and lower attack frequency, but diet alone usually cannot prevent gout in people with a genetic tendency to high uric acid or poor kidney function. Limiting red meat, organ meats, certain seafood, and alcohol helps, but most people with chronic gout need medication to keep uric acid low enough to prevent attacks.
Does gout go away on its own?
A single acute attack will resolve on its own over days to weeks, even without treatment. But if the underlying cause—high uric acid—is not addressed, more attacks will follow. Long-term medication that lowers uric acid can prevent future attacks and is the standard approach for people with recurrent gout.