Low-dose aspirin can raise your risk of gout flares, but if you’re taking it for heart protection, experts recommend you keep taking it. The relationship between aspirin and gout is more nuanced than a simple yes or no. Aspirin affects how your kidneys handle uric acid, and the direction of that effect depends entirely on the dose.
How Aspirin Affects Uric Acid
Aspirin has what researchers call a “bimodal effect” on uric acid, meaning it does opposite things at different doses. At low doses (1 to 2 grams per day, or roughly 3 to 6 regular-strength tablets), aspirin causes your kidneys to hold onto uric acid instead of flushing it out. Even at the smallest cardiovascular dose of 75 mg per day, aspirin reduces uric acid excretion by about 15%, which is enough to nudge blood levels of uric acid measurably higher.
At high doses (above 3 grams per day), aspirin flips and actually helps your kidneys push uric acid out. But nobody takes aspirin at those levels anymore. Doses that high carry serious risks for stomach bleeding and other side effects, so the uricosuric benefit of high-dose aspirin is essentially a medical footnote, not a practical option.
The doses most people encounter, whether it’s a baby aspirin (81 mg) for heart health or a couple of regular tablets for a headache, fall squarely in the range that promotes uric acid retention.
How Much It Raises Gout Flare Risk
A well-known study on recurrent gout attacks put real numbers on this risk. Taking 325 mg or less of aspirin daily was associated with an 81% higher odds of a gout flare compared to not taking aspirin at all. The effect was actually slightly stronger at lower doses: people taking 81 mg or less daily (the standard heart-protection dose) had a 91% higher risk of an attack.
That sounds alarming, but context matters. These odds ratios describe relative risk, not absolute risk. If your baseline chance of a flare on any given day is low because your uric acid is well controlled, an 81% to 91% increase over a small number is still a small number. But if your uric acid levels are already borderline or poorly managed, that extra push from aspirin could be enough to tip you into a flare.
Certain factors can amplify aspirin’s effect on uric acid. Taking diuretics (water pills) alongside aspirin enhances uric acid retention. Low albumin levels in the blood do the same. If either of these applies to you, the impact of even a baby aspirin on your uric acid may be more pronounced.
What About Uric Acid Levels Over Time?
Interestingly, one large clinical trial in Chinese adults over 60 found that low-dose aspirin actually slightly decreased serum uric acid levels overall, from 311 to 302 micromol/L. The drop was most notable in people who already had elevated uric acid: their levels fell from 429 to 392 micromol/L. People with normal uric acid saw no meaningful change.
This seems to contradict the flare data, but the two findings aren’t necessarily in conflict. Uric acid levels fluctuate, and gout flares can be triggered by sudden shifts in uric acid in either direction, not just by high levels alone. A drop in uric acid can destabilize existing crystal deposits in the joints and provoke a flare. So aspirin’s short-term effects on uric acid excretion and its longer-term effects on blood levels may both contribute to flare risk through different pathways.
Should You Stop Taking Aspirin?
If you take low-dose aspirin because your doctor prescribed it for cardiovascular protection, the 2020 American College of Rheumatology guideline is clear: don’t stop. The guideline specifically recommends against discontinuing low-dose aspirin as a strategy to lower uric acid, noting that there are few practical alternatives for people who need it for their heart. The cardiovascular benefit outweighs the modest increase in gout risk for most patients.
The more important lever for controlling gout is managing uric acid through other means, whether that’s urate-lowering therapy, dietary adjustments, or staying well hydrated. If you’re on aspirin and experiencing frequent flares, the solution is usually to optimize your gout treatment rather than drop the aspirin.
Aspirin for Gout Pain Relief
One thing to avoid is reaching for aspirin when a gout flare strikes. It’s a natural instinct since aspirin is a pain reliever, but it’s a poor choice for gout specifically. It won’t reduce uric acid at pain-relief doses, and it may worsen the underlying problem by further impairing uric acid excretion.
Better options for acute gout pain include other anti-inflammatory medications like ibuprofen, which is available over the counter. Prescription options include colchicine, which works best when started early in a flare, and corticosteroids for people who can’t tolerate anti-inflammatories. Low-dose colchicine combined with an anti-inflammatory is sometimes used for particularly stubborn attacks. Treatment for an acute flare is typically short, lasting only until symptoms resolve.
The Bottom Line on Aspirin and Gout
Low-dose aspirin does make gout slightly harder to manage. It reduces your kidneys’ ability to clear uric acid and is associated with a meaningfully higher risk of flares. But for people who need it for cardiovascular reasons, stopping aspirin creates a bigger health risk than the gout flares it might contribute to. The practical approach is to keep taking your aspirin if it’s prescribed, treat gout flares with appropriate alternatives, and work with your doctor to keep uric acid levels in a safe range through other strategies.