Guide to Uric Acid

WRITTEN BY

The Levels Team

Updated: 05/22/2025|12 min read

Summary

Uric acid is a natural compound produced by your body when it breaks down purines, found in certain foods and also created as part of normal cellular processes.

Why It Matters

At appropriate levels, uric acid functions as an antioxidant, helps heal tissue, and protects the nervous system. It also plays an evolutionary role in helping convert fructose to fat more efficiently - an adaptation that likely helped our ancestors survive food scarcity by storing energy during times of plenty.

However, if levels become elevated, uric acid can crystallize in joints and tissues, most famously causing gout - an extremely painful form of arthritis characterized by sudden, severe joint pain and inflammation, typically in the big toe. Beyond gout and kidney stones, high uric acid also contributes to oxidative stress and systemic inflammation. This inflammation is a risk factor for numerous chronic conditions, including Type 2 diabetes, metabolic dysfunction-associated steatotic liver disease (formerly known as non-alcoholic fatty liver disease), obesity, kidney disease, and heart disease.

Uric acid produces reactive oxygen species (ROS) that can interfere with normal insulin signaling, potentially leading to insulin resistance. It also directly inactivates nitric oxide production, causing blood vessels to narrow, which can drive hypertension by restricting blood flow. Additionally, high uric acid levels may trigger systemic inflammation through the secretion of inflammatory proteins called cytokines.

Research has shown strong connections between elevated uric acid and metabolic health. Studies have found that people with high uric acid levels are significantly more likely to develop various serious conditions, and some research suggests that even levels in the upper end of the "normal" range may contribute to metabolic dysfunction.

When measured in your blood, uric acid provides insights into your metabolic health, kidney function, and potential risk for conditions like gout and kidney stones. Identifying and addressing high levels early can help prevent painful gout attacks, kidney stone formation, and potentially reduce risk of cardiometabolic diseases.

Associated Symptoms

Uric acid levels themselves are laboratory findings rather than medical conditions. However, abnormal levels may be associated with various health conditions, each with its own symptoms.

Common symptoms that may indicate conditions associated with high uric acid:

• Joint pain: Sudden, intense pain typically in the big toe, ankles, or knees, potentially caused by uric acid crystal formation in joints and surrounding tissues
• Joint swelling and redness: May indicate an inflammatory response to uric acid crystal deposits in affected joints
• Kidney pain: Discomfort in the lower back or sides may be related to kidney stone formation from uric acid crystallization
• Fatigue: Reduced energy levels may be associated with a gout flare-up or the metabolic effects of elevated uric acid
• Skin changes: Itchy, red patches or visible bumps (tophi) can be caused by uric acid deposits under the skin

Low uric acid levels are relatively uncommon but may be associated with neurological issues in some cases, as uric acid serves as an antioxidant in the nervous system.

It's important to understand that many people with moderately elevated uric acid may experience no symptoms at all until kidney stones develop or crystals form in joints or tissues (gout). This makes laboratory testing particularly valuable for early detection before these painful conditions develop. The presence of symptoms alongside abnormal uric acid provides context for further investigation, but additional testing is typically needed to determine the underlying cause.

Clinical Ranges

Female:

• 16-18 Years: 2.4-6.6 mg/dL
• ≥19 Years: 2.5-7.0 mg/dL

Male:

• 16-18 Years: 2.1-7.6 mg/dL
• ≥19 Years: 4.0-8.0 mg/dL

Lifestyle Factors That Can Impact It

Factors that may increase uric acid levels include the following:

• Consuming high-purine foods such as organ meats, red meat, shellfish, and certain fish (sardines, anchovies)
• High alcohol consumption, especially beer (which contains purines) impairs uric acid excretion
• High intake of sugar-sweetened beverages (particularly fructose) and foods
• Crash dieting or fasting
• Dehydration

Factors that may help lower uric acid levels include the following:

• Following a Mediterranean diet pattern
• Maintaining healthy body weight through gradual, sustainable weight loss if overweight or obese
• Regular, moderate or vigorous physical activity
• Eating vitamin C-rich foods or taking supplements

Other Factors That Can Impact It

Medical Conditions

• Hypertension: Both contributes to and results from high uric acid through kidney function effects and vascular changes
• Hypothyroidism: Increases uric acid levels by reducing renal blood flow and glomerular filtration rate

Medications

• Diuretics, especially thiazides: Increase uric acid by reducing renal excretion and increasing reabsorption
• Low-dose aspirin: Raises uric acid slightly by reducing renal excretion and promotes reabsorption
• Niacin (vitamin B3): Increases uric acid levels by decreasing excretion
• Cyclosporine and tacrolimus: Can raise uric acid by affecting renal handling
• Allopurinol and febuxostat: Decrease uric acid by inhibiting xanthine oxidase, the enzyme responsible for uric acid production
• Losartan (an angiotensin II reception blocker, used to treat high blood pressure): Uniquely lowers uric acid by enhancing excretion

Testing Accuracy and Stability

Recent meals, alcohol use, exercise, and hydration can all influence the results of a uric acid test.

Factors That Can Affect the Accuracy of Your Test

• Recent high-purine meals can increase levels, potentially leading to temporarily elevated results.
• Alcohol consumption within 24 hours before testing can raise levels by increasing production and decreasing excretion.
• Intense exercise in the 24 hours before testing can temporarily increase levels.
• Dehydration can artificially increase measured levels through increased concentration and reduced excretion.

How It Relates to Other Markers

Other tests can provide insights about health status when they're viewed alongside uric acid results. These tests may include:

• Fasting glucose and insulin: Elevated uric acid with prediabetic fasting glucose levels (100--125 mg/dL) may be more strongly associated with diabetes progression compared to normal uric acid and fasting glucose levels.
• Triglycerides: High uric acid with elevated triglycerides ( ≥150 mg/dL) may indicate increased metabolic syndrome risk.
• Blood pressure: High uric acid increases the risk of high blood pressure.
• Glomerular filtration rate (GFR) and creatinine: Suboptimal kidney function markers with rising uric acid may suggest a potential negative feedback loop in which each worsens the other.
• Alanine aminotransferase and aspartate aminotransferase liver enzymes: Elevation of both uric acid and liver enzymes increases the risk of metabolic dysfunction-associated steatotic liver disease (MASLD) compared to either marker alone.

What Results May Mean in the Context of Other Markers

• High uric acid with normal kidney function: May be diet-related or genetic.
• High uric acid with elevated triglycerides and glucose: Can indicate metabolic syndrome.
• High uric acid with reduced GFR/elevated creatinine: May suggests kidney function is affecting uric acid clearance.
• High uric acid with a history of gout attacks: May indicate the need for consistent uric acid management to prevent future attacks.
• Elevated uric acid with high blood pressure: Consider uric acid's potential contribution to hypertension; lowering uric acid may improve blood pressure control.
• Low uric acid with neurological symptoms: Rare pattern that may be associated with neurodegenerative conditions; further neurological evaluation may be warranted.

Follow-up Considerations

If your uric acid level is high, your provider may make some of the following recommendations. You should always speak to your doctor if you have medical questions or before making medical decisions.

When Re-Testing May Be Appropriate

• Normal levels: Annual screening with regular metabolic panels
• Borderline high: Every 6 months
• Elevated levels: Every 3--4 months during treatment adjustment
• History of gout: Every 3--6 months
• During medication changes: 2--4 weeks after starting uric acid-affecting medications

Additional Testing Your Doctor May Consider

• Complete metabolic panel
• Inflammatory markers (C-reactive protein, erythrocyte sedimentation rate)
• Fasting insulin and glucose
• 24-hour urine uric acid (to determine if high levels are from overproduction or underexcretion)
• Joint fluid analysis if gout is suspected
• Kidney ultrasound if stones are suspected

When Additional Care May Be Warranted

• Uric acid levels persistently above 8 mg/dL despite lifestyle modifications
• Acute, severe joint pain (possible gout attack)
• Visible tophi (uric acid deposits under the skin)
• Kidney stone symptoms with elevated uric acid
• Rapidly declining kidney function with high uric acid
• Uncontrolled blood pressure with elevated uric acid

Further Reading

How to reduce uric acid naturally

The 2023 Levels Guide to uric acid

How uric acid drives weight gain, disease and more