High uric acid levels result from your body producing too much uric acid, not excreting enough of it, or both. Levels above 6.8 mg/dL are considered elevated, a condition called hyperuricemia. Normal ranges fall between 4.0 and 8.5 mg/dL for adult men and 2.7 and 7.3 mg/dL for adult women. The causes span diet, genetics, kidney function, medications, and metabolic conditions, and most people have more than one factor at play.
How Your Body Makes Uric Acid
Uric acid is the end product of purine breakdown. Purines are molecules found in every cell in your body and in many foods. When cells turn over or when you digest purine-rich foods, your body breaks those purines down through a series of chemical steps. The final enzyme in this chain converts intermediate waste products into uric acid. Normally, about 90% of one key intermediate (hypoxanthine) gets recycled back into usable molecules through a salvage pathway rather than being converted to uric acid. When that recycling system is overwhelmed or impaired, more purines flow toward the waste end of the pathway, and uric acid production rises.
Once produced, roughly two-thirds of your daily uric acid output leaves through the kidneys and one-third through the intestines. Any disruption on either side of this equation, production or excretion, can tip the balance toward accumulation.
Diet: Purines, Fructose, and Alcohol
High-Purine Foods
Certain foods deliver a heavy purine load. Beef, pork, lamb, and organ meats like liver, kidneys, and sweetbreads are among the highest sources. Seafood is another major contributor, particularly anchovies, sardines, mackerel, scallops, and shellfish. Eating these foods regularly increases the raw material your body must process into uric acid.
Fructose and Added Sugar
Fructose raises uric acid through a mechanism entirely separate from purines. When your liver metabolizes fructose, the enzyme responsible works as fast as it can without any regulation, rapidly consuming your cells’ energy currency (ATP). That rapid energy depletion generates a buildup of a breakdown product that gets funneled into the purine waste pathway and converted to uric acid. This is why sugary drinks, fruit juices, and foods sweetened with high-fructose corn syrup are consistently linked to higher uric acid levels.
Research has also shown a second, less well-known mechanism: fructose doesn’t just deplete existing energy molecules, it also activates genes that ramp up the creation of entirely new purines from scratch. At the same time, fructose increases the activity of the enzyme that converts those purines into uric acid while reducing the activity of the enzyme that would break uric acid down further. The result is a double hit of increased production and decreased clearance.
Alcohol
All types of alcohol raise uric acid, but the degree varies. Beer carries the highest risk because it contains both ethanol and high concentrations of purines. Spirits come next. Although they contain fewer purines than beer, their high ethanol concentration promotes lactic acid production during metabolism. That lactic acid competes with uric acid for excretion in the kidneys, effectively blocking uric acid from leaving the body.
Wine shows the weakest association with high uric acid. Red wine in particular contains polyphenolic compounds that may partially offset the ethanol effect by reducing oxidative stress and inhibiting the enzyme responsible for uric acid production. Still, wine is not neutral. It carries a measurable increase in risk, just less than beer or spirits.
Kidney Function and Excretion Problems
Because the kidneys handle about 70% of uric acid removal, anything that impairs kidney function can cause levels to climb. Specialized transport proteins in the kidney’s filtering tubes control how much uric acid gets reabsorbed back into the blood versus how much passes into urine. The balance between these reabsorption and excretion transporters determines your net output.
Chronic kidney disease (CKD) is one of the strongest drivers. As kidney function declines, uric acid accumulates dramatically. Among people with normal kidney function, about 11% have high uric acid levels. By stage 4 CKD, that figure jumps to 80%. The relationship works both ways: 70% of people with gout (a consequence of sustained high uric acid) also have stage 2 or higher CKD.
Insulin Resistance and Metabolic Conditions
Insulin resistance, the hallmark of type 2 diabetes and metabolic syndrome, directly affects how your kidneys handle uric acid. High insulin levels increase the activity of a kidney transporter that pulls uric acid back into the bloodstream while simultaneously reducing the activity of a transporter that pushes uric acid out into urine. The net effect is that more uric acid stays in your body.
This explains why high uric acid so often accompanies obesity, high blood pressure, high triglycerides, and elevated blood sugar. These conditions share insulin resistance as a common thread, and that insulin resistance creates a metabolic environment where uric acid accumulates. Losing weight and improving insulin sensitivity often lower uric acid levels even without dietary changes specifically targeting purines.
Genetics and Urate Transporters
Your genes play a significant role in determining your baseline uric acid level. The transport proteins in your kidneys that control uric acid reabsorption and excretion are encoded by specific genes, and variants in these genes can shift the balance substantially. Two proteins are especially important: one (GLUT9) sits on kidney cell membranes and reabsorbs uric acid back into the blood, while another (ABCG2) is the major excretion transporter responsible for moving uric acid out of the body.
Variants in the genes encoding these transporters can make you inherently more efficient at reabsorbing uric acid or less efficient at excreting it. This is why some people develop high uric acid levels despite a relatively healthy diet, and why gout and hyperuricemia tend to run in families. Genetic factors don’t act in isolation, but they set the baseline that diet, weight, and other factors build upon.
Medications That Raise Uric Acid
Several common medications can push uric acid levels up. Diuretics (water pills) are among the most frequent culprits. They work by increasing urination, which concentrates the remaining body fluid and makes uric acid crystals more likely to form. Some types also directly interfere with the kidney’s ability to excrete urate. If you’re taking a diuretic for blood pressure or heart failure and your uric acid levels are elevated, the medication is a likely contributor.
Low-dose aspirin also reduces uric acid excretion through the kidneys. Certain immunosuppressant drugs used after organ transplants and some medications used in cancer treatment can raise levels as well, the latter because rapid cell destruction releases a flood of purines all at once.
Cell Turnover and Other Causes
Any condition that accelerates cell breakdown increases the purine load your body must process. Blood cancers, psoriasis, and hemolytic anemias (where red blood cells are destroyed faster than normal) all raise uric acid production. Chemotherapy and radiation therapy can cause a sudden spike by destroying large numbers of cells simultaneously, a phenomenon called tumor lysis syndrome.
Dehydration is a simpler but often overlooked cause. When your fluid volume drops, the concentration of uric acid in your blood rises, and your kidneys have less capacity to flush it out. Strenuous exercise, fasting, and crash diets can also temporarily raise levels by increasing cell breakdown or producing lactic acid that competes with uric acid for kidney excretion.
When High Uric Acid Becomes a Problem
Many people have elevated uric acid without symptoms. Asymptomatic hyperuricemia, as it’s called, doesn’t always require treatment. Major medical organizations generally recommend against starting medication for high uric acid alone unless levels exceed 10 mg/dL, there’s a family history of gout or kidney disease, or other conditions like hypertension or diabetes are present.
Treatment is typically recommended when high uric acid causes gout flares (two or more per year), visible uric acid deposits called tophi, or kidney damage. The treatment target is usually below 6 mg/dL, or below 5 mg/dL for people with tophi or frequent attacks. Understanding which factors are driving your levels up is the first step toward figuring out which ones you can change.