The Dangers of Low-Dose Aspirin: Time to Reconsider Its Widespread Use

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Aspirin, one of the most widely used medications worldwide, has been a staple in the prevention of cardiovascular disease for decades. However, a growing body of evidence suggests that the risks associated with daily low-dose aspirin use may outweigh its potential benefits for many individuals. Recent studies have shed light on the serious side effects linked to aspirin, including an increased risk of life-threatening bleeding events and the development of gastric and duodenal ulcers.

Increased Risk of Gastric and Duodenal Ulcers

A landmark yet still underreported 2022 study published in The Lancet, titled "Strongly increased risk of gastric and duodenal ulcers among new users of low-dose aspirin: results from two large cohorts with new-user design," revealed alarming findings. Researchers analyzed data from two large cohorts in Sweden, totaling over 1.1 million individuals, and compared the incidence of gastric and duodenal ulcers between new users of low-dose aspirin (75-160 mg/day) and matched non-users. The results showed that new aspirin users had a 5.5-fold increased risk of gastric ulcers and a 6.1-fold increased risk of duodenal ulcers compared to non-users.1 The risk was highest during the first two months of aspirin use but remained elevated even after five years.

Aspirin's Bleeding Risks

In addition to the increased risk of ulcers, aspirin has been linked to a heightened risk of severe bleeding complications. A 2012 study published in JAMA found that regular aspirin use was associated with a 55% relative risk increase in major bleeding episodes, particularly in the gastrointestinal tract and brain, compared to those not taking aspirin.2 This study, conducted by researchers in Italy, looked at a large population-based cohort of over 186,000 individuals being treated with low-dose aspirin for primary prevention of cardiovascular disease.

The findings of these studies underscore the serious potential consequences of daily aspirin use, which may have been underestimated in the past. With gastrointestinal bleeding carrying a fatality rate of 5-10%3 and hemorrhagic stroke having a 30-50% mortality rate,4 the implications of these risks cannot be overlooked.

Reevaluating the Use of Aspirin for Primary Prevention

Given the mounting evidence of aspirin's dangers, it is crucial for patients and healthcare providers to reassess the widespread use of this medication for the primary prevention of cardiovascular disease. The decision to initiate daily aspirin should be made on an individual basis, carefully weighing a person's unique risk factors against the potential for serious adverse effects.

In fact, the most recent cardiovascular disease prevention guidelines from the American College of Cardiology and the American Heart Association, published in 2019, explicitly advise against the routine use of low-dose aspirin for primary prevention in most cases.5 This shift in recommendations reflects the growing recognition of aspirin's potential harms and the need for a more personalized approach to preventive care.

Natural Alternatives to Aspirin

For those seeking to support their cardiovascular health without the risks associated with aspirin, several evidence-based natural alternatives are worth considering. One promising option is pycnogenol, a powerful antioxidant compound derived from French maritime pine bark. Pycnogenol has been shown to inhibit platelet aggregation and improve endothelial function, two key factors in maintaining a healthy cardiovascular system.6,7 Notably, unlike aspirin, pycnogenol does not significantly increase bleeding time, suggesting a more favorable safety profile.8

Other natural approaches to promoting cardiovascular health include:

1. Omega-3 fatty acids: Found in oily fish and fish oil supplements, omega-3s have been shown to reduce platelet aggregation and support healthy blood flow.9

2. Garlic: Garlic and its active compounds have been found to possess antiplatelet and fibrinolytic properties, which may help prevent the formation of blood clots.10

3. Vitamin K2: This essential nutrient plays a crucial role in regulating calcium metabolism and has been associated with improved arterial health and reduced risk of cardiovascular disease.11


The recent findings on the increased risk of ulcers and bleeding associated with daily low-dose aspirin use underscore the need for a more cautious and individualized approach to cardiovascular disease prevention. While aspirin may still have a role in certain high-risk populations, its routine use for primary prevention should be carefully reevaluated in light of these potential harms.

By exploring evidence-based natural alternatives and adopting a holistic approach to cardiovascular health, individuals may be able to support their heart and vascular system without exposing themselves to the serious risks associated with chronic aspirin use. As always, it is essential to consult with a trusted healthcare provider before making any changes to your medication regimen or preventive care plan.

To learn more about the unintended, adverse effects of aspirin, visit our database on the subject here.



1: Chalkidou, Theodora, Fredrik Mattsson, John Naessén, Johan Sundström, Jonas F Ludvigsson, and Helle Kieler. "Strongly increased risk of gastric and duodenal ulcers among new users of low-dose aspirin: results from two large cohorts with new-user design.The Lancet Gastroenterology & Hepatology (2023).

2: De Berardis, Giorgia, Giuseppe Lucisano, Antonio D'Ettorre, Fabio Pellegrini, Vito Lepore, Gianni Tognoni, and Antonio Nicolucci. "Association of aspirin use with major bleeding in patients with and without diabetes.Jama 307, no. 21 (2012): 2286-2294.

3: Nelms, Douglas W., and Tom J. Obermeyer. "An Approach to Upper Gastrointestinal Bleeding." Missouri Medicine 114, no. 5 (2017): 370-74.

4: An, Sang Joon, Tae Jung Kim, and Byung-Woo Yoon. "Epidemiology, Risk Factors, and Clinical Features of Intracerebral Hemorrhage: An Update.Journal of Stroke 19, no. 1 (2017): 3-10. 

5: Arnett, Donna K., Roger S. Blumenthal, Michelle A. Albert, Andrew B. Buroker, Zachary D. Goldberger, Ellen J. Hahn, Cheryl Dennison Himmelfarb et al. "2019 ACC/AHA guideline on the primary prevention of cardiovascular disease: a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines.Journal of the American College of Cardiology 74, no. 10 (2019): e177-e232.

6: Rohdewald, Peter. "A review of the French maritime pine bark extract (Pycnogenol), a herbal medication with a diverse clinical pharmacology.International journal of clinical pharmacology and therapeutics 40, no. 4 (2002): 158-168.

7: Enseleit, Frank, Isabella Sudano, Daniel Périat, Stefanie Winnik, Mathias Wolfrum, Andreas J. Flammer, Astrid Fröhlich et al. "Effects of Pycnogenol on endothelial function in patients with stable coronary artery disease: a double-blind, randomized, placebo-controlled, cross-over study.European heart journal 33, no. 13 (2012): 1589-1597.

8: Pütter, M., K. H. Grotemeyer, G. Würthwein, M. Araghi-Niknam, R. R. Watson, S. Hosseini, and P. Rohdewald. "Inhibition of smoking-induced platelet aggregation by aspirin and pycnogenol.Thrombosis research 95, no. 4 (1999): 155-161.

9: Din, Jehangir N., Scott A. Harding, Christopher J. Valerio, John Sarma, Karin Lyall, David E. Riemersma, Nicholas A. Boon, and Andrew D. Flapan. "Dietary intervention with oil rich fish reduces platelet-monocyte aggregation in man.Atherosclerosis 197, no. 1 (2008): 290-296. 

10: Chan, Koon-Ho, Stephen Yin, and Denis Chow. "Garlic and Vascular Disease Prevention.J Nutr Food Sci 5, no. 430 (2015): 2.

11: Schurgers, L. J., K. J. F. Teunissen, K. Hamulyák, M. H. J. Knapen, H. Vik, and C. Vermeer. "Vitamin K–containing dietary supplements: comparison of synthetic vitamin K1 and natto-derived menaquinone-7.Blood 109, no. 8 (2007): 3279-3283.

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