Hyperuricemia is a condition where uric acid levels in your blood are higher than normal. The threshold is generally above 7 mg/dL in men and above 6 mg/dL in women, with readings of 8 mg/dL or higher considered clearly diagnostic. Most people with hyperuricemia have no symptoms at all, but over time, elevated uric acid can lead to gout, kidney stones, and increased risk of cardiovascular problems.
How Uric Acid Builds Up
Uric acid is a waste product your body creates when it breaks down purines, compounds found naturally in your cells and in many foods. In most mammals, an enzyme in the liver breaks uric acid down further into a more easily excreted substance. Humans and great apes lost that enzyme through evolution, which means uric acid is the final stop in the process. Whatever your body produces has to be eliminated as-is.
About 70% of uric acid leaves your body through the kidneys, while the remaining 30% is excreted through the intestines. Hyperuricemia develops when either side of the equation tips: your body produces too much uric acid, your kidneys don’t filter enough of it out, or both happen at once. In practice, impaired kidney excretion is the more common culprit.
Common Causes and Triggers
Diet is one of the most controllable factors. Foods high in purines directly increase uric acid production. The major offenders include red meat, organ meats like liver, shellfish (lobster, shrimp, sardines), beer (including nonalcoholic beer), and drinks sweetened with high fructose corn syrup. Alcohol raises uric acid through multiple pathways: beer is itself high in purines, and alcohol in general interferes with the kidneys’ ability to clear uric acid.
Fructose deserves special attention. When your liver processes fructose, it burns through its energy stores (ATP) unusually fast because the enzyme responsible works without any built-in speed limit. That rapid energy depletion triggers a cascade where the leftover molecular fragments get broken down into uric acid. Fructose also stimulates the body to manufacture new purines from scratch, adding even more raw material for uric acid production. This is why sugary sodas and fruit drinks can raise uric acid levels even though they contain no purines themselves.
Several common medications can also push uric acid levels up. Thiazide diuretics, often prescribed for high blood pressure, are among the most frequent drug-related causes. Low-dose aspirin (up to 2 grams per day) increases uric acid retention. Nicotinic acid (vitamin B3) and certain tuberculosis drugs can do the same. If you’re taking any of these and your uric acid is elevated, the medication may be a contributing factor worth discussing with your doctor.
Genetics and Kidney Transporters
Your genes play a significant role in how efficiently your kidneys handle uric acid. The kidney’s filtering system uses specialized transporter proteins to absorb uric acid back into the bloodstream or pump it out into urine. When the transporters responsible for secreting uric acid into urine don’t work well, the balance shifts toward reabsorption, and levels climb.
One well-studied genetic variant reduces the function of a key secretory transporter called ABCG2 by 53%, meaning roughly half the uric acid that should be pumped out stays in circulation. Other transporter genes affect the absorptive side. These genetic differences help explain why some people develop hyperuricemia despite a relatively healthy diet, and why the condition often runs in families.
Hyperuricemia Without Symptoms
The majority of people with elevated uric acid never develop gout or kidney stones. Only up to 36% of people with hyperuricemia eventually develop gout. Even among those with very high levels (10 mg/dL or above), only about half developed clinically apparent gout over a 15-year follow-up period. This long-standing observation has puzzled researchers, since high uric acid is a necessary ingredient for crystal formation but clearly isn’t sufficient on its own.
That said, “asymptomatic” doesn’t necessarily mean “harmless.” Elevated uric acid, even without gout, has been linked to increased risk of hypertension, metabolic syndrome, type 2 diabetes, and cardiovascular disease. The uric acid itself may contribute to tissue damage through inflammation and effects on blood vessel function. Whether treating asymptomatic hyperuricemia with medication actually reduces these risks remains an open and actively debated question in medicine. Currently, most guidelines do not recommend routine drug treatment for high uric acid alone.
When It Does Cause Problems
When uric acid levels stay elevated long enough, the excess can form needle-shaped crystals of monosodium urate. Where those crystals deposit determines what happens next. In joints, they trigger gout: sudden, intense pain, swelling, redness, and warmth, most commonly in the big toe but potentially in any joint. In the urinary tract, uric acid can form kidney stones, which cause sharp pain in the back or side as they pass.
Gout flares tend to come on fast, often overnight, and can be debilitating for days to weeks. The first attack usually involves a single joint, but without management, flares can become more frequent and affect multiple joints. Over years, persistent crystal deposits can form visible lumps under the skin called tophi and cause lasting joint damage.
How It’s Diagnosed
A simple blood draw is the standard way to check uric acid levels. No fasting is typically required. Your doctor may order this test if you have symptoms of gout, a history of kidney stones, or risk factors like obesity or kidney disease. A single high reading confirms hyperuricemia, though uric acid levels can fluctuate, so your doctor may recheck over time.
In some cases, a 24-hour urine collection helps determine whether the problem is overproduction or under-excretion. You collect all urine over a full day in a provided container (kept refrigerated), then return it to the lab. This distinction matters because it can guide treatment choices. If gout is suspected, a sample of fluid from the affected joint can confirm the presence of urate crystals under a microscope.
Management and Treatment
Lifestyle changes are the first line of defense. Reducing intake of high-purine foods, cutting back on alcohol (especially beer), limiting sugary drinks, staying well hydrated, and maintaining a healthy weight can all meaningfully lower uric acid. For some people, these changes alone bring levels back into the normal range.
When lifestyle modifications aren’t enough, particularly if you’re experiencing gout flares or kidney stones, medications that reduce uric acid production are the most common approach. These drugs work by blocking the enzyme (xanthine oxidase) that converts purines into uric acid. Treatment typically starts at a low dose and is adjusted upward based on follow-up blood tests, with the goal of keeping uric acid below 6 mg/dL to prevent crystal formation. These medications are taken daily and are generally long-term commitments, since uric acid levels rise again once the medication stops.
For people whose hyperuricemia is driven primarily by poor kidney excretion rather than overproduction, a different class of medications can help the kidneys clear more uric acid into the urine. Your doctor’s choice between these approaches often depends on the results of that 24-hour urine test and your overall kidney function.