For decades, the image of a small white pill sat at the center of heart health advice in America. “Take an aspirin a day to keep the heart doctor away” became folk wisdom so entrenched that millions of people still follow it — often without a doctor’s recommendation. But the science on aspirin has shifted dramatically, and several long-standing beliefs are now directly contradicted by large-scale clinical evidence.
Here, we break down seven of the most persistent aspirin myths — and what the research actually shows.
Myth 1: Daily Aspirin Prevents First Heart Attacks in Healthy People
This may be the most dangerous myth of all. For years, low-dose aspirin was routinely recommended for anyone over 50 to prevent a first cardiovascular event — a strategy called primary prevention. But three landmark trials published simultaneously in 2018 upended that thinking.
The ARRIVE trial, published in The Lancet, enrolled over 12,000 moderate-risk adults and found that aspirin did not significantly reduce cardiovascular events compared to placebo. The ASPREE trial, published in The New England Journal of Medicine, found that healthy adults aged 70 and older who took daily aspirin actually had a higher rate of all-cause mortality than those who did not — driven largely by increased major bleeding, including gastrointestinal hemorrhage and intracranial bleeding. The ASCEND trial, studying adults with diabetes, found that aspirin reduced serious vascular events but caused an almost equivalent number of major bleeding episodes.
In response to this accumulating evidence, the U.S. Preventive Services Task Force (USPSTF) revised its guidelines in 2022, recommending against initiating aspirin for primary cardiovascular prevention in adults aged 60 and older. For adults aged 40 to 59 with a 10% or greater 10-year cardiovascular risk, the decision should be individualized in consultation with a clinician.
Myth 2: The More Aspirin You Take, the More Protection You Get
Aspirin’s cardiovascular effects are largely dose-independent once a minimum threshold is crossed. Research consistently shows that low-dose aspirin (75–100 mg, commonly sold as “baby aspirin” at 81 mg) provides the same platelet-inhibiting benefit as higher doses — while significantly reducing gastrointestinal bleeding risk. Taking 325 mg or more daily does not offer more cardiovascular protection. It simply adds more risk.
Myth 3: Enteric-Coated Aspirin Is Safer for Your Stomach
Many people switch to enteric-coated formulations believing the coating prevents stomach damage. However, studies including research published in The American Journal of Gastroenterology have found that enteric coating does not meaningfully reduce the risk of serious gastrointestinal bleeding compared to regular aspirin. The coating delays absorption into the bloodstream, but aspirin’s damage to the gastrointestinal lining occurs largely through its systemic effect on prostaglandins — not through direct contact with the stomach wall. The protection is largely illusory.
Myth 4: Aspirin Is Safe for Almost Everyone
Aspirin is widely available without a prescription, which contributes to a perception that it’s universally safe. In reality, it carries meaningful risks for specific groups:
- People with a history of peptic ulcers or gastrointestinal bleeding
- Those taking anticoagulants such as warfarin, apixaban, or rivaroxaban
- People with severe kidney or liver impairment
- Individuals with aspirin sensitivity or NSAID-exacerbated respiratory disease
- Pregnant women, particularly in the third trimester, except under specific medical guidance
The clinical principle is clear: aspirin’s risk-benefit profile is highly individualized. Self-prescribing carries real dangers, and what helps one person can seriously harm another.
Myth 5: Aspirin Clearly Prevents Cancer
Research has long suggested a link between regular aspirin use and reduced colorectal cancer risk. A systematic review published in JAMA Oncology found that long-term aspirin use was associated with roughly a 19% reduction in colorectal cancer incidence, and some studies point to modest protective effects against other gastrointestinal cancers.
However, current oncology guidelines do not recommend starting aspirin solely for cancer prevention in the general population. The bleeding risks — including life-threatening gastrointestinal hemorrhage and hemorrhagic stroke — complicate any blanket recommendation. The USPSTF has explicitly noted that potential cancer prevention benefits do not outweigh bleeding risks in primary prevention settings for older adults.
Myth 6: You Can Stop Aspirin Cold Turkey Whenever You Choose
For people who have been on long-term aspirin therapy — especially those with a history of heart attack, ischemic stroke, or coronary stent placement — abruptly stopping can be dangerous. Research published in the Journal of the American College of Cardiology has documented a “rebound effect”: a period of heightened platelet aggregation and elevated clotting risk in the days immediately following discontinuation. Anyone considering stopping aspirin therapy should do so only under the guidance of a cardiologist or primary care physician.
Myth 7: Aspirin Is Becoming Obsolete in Modern Heart Care
While the primary prevention picture has changed, aspirin remains a cornerstone of secondary prevention — for people who have already experienced a heart attack, ischemic stroke, or undergone coronary artery stenting. For these patients, guidelines from the American Heart Association and American College of Cardiology continue to support low-dose aspirin as part of antiplatelet therapy, unless specific contraindications exist.
Newer antiplatelet agents like clopidogrel and ticagrelor are used alongside or instead of aspirin depending on the clinical scenario — but aspirin has not been replaced. It has been right-sized to the populations who benefit most from it.
What Should You Actually Do?
The era of broadly recommending daily aspirin to healthy adults is over, based on current clinical evidence. The pill once considered an almost universal preventive tool now carries recognized risks that frequently outweigh benefits in people without established cardiovascular disease.
If you are currently taking daily aspirin without a specific medical indication, research suggests it is worth discussing with your healthcare provider whether it remains appropriate for your individual situation. And if you have a history of heart disease or stroke, do not stop taking aspirin without professional guidance — it may still be a critical part of your treatment plan.
The honest answer to “should I take aspirin?” is increasingly: it depends on your personal health history, risk factors, and medical situation — and your doctor is the best person to help you weigh those factors.
Disclosure: This content is for informational purposes only and is not medical advice. Always consult a qualified healthcare provider before making changes to your health regimen.