Investigators conducted the review because the overall balance between risks and benefits of taking aspirin has been unclear. The team pooled information from analyses of all relevant observational studies and randomized controlled trials.

Use of low-dose aspirin in people without cardiovascular disease was associated with a 17% lower incidence of cardiovascular events (such as non-fatal heart attacks, non-fatal strokes, or cardiovascular-related deaths). Low-dose aspirin use was also associated with a 47% higher risk of gastrointestinal bleeding and a 34% higher risk of intracranial bleeding.

"These risks and benefits need to be weighted in formal decision analyses to guide aspirin use in primary prevention," said co-author Lee Smith, MSc, PhD, of Anglia Ruskin University, in the UK.?

The authors noted that although many dozens of health effects besides cardiovascular disease and bleeding have been assessed, evidence for these remains weak and therefore should not be a major consideration when deciding whether to use low-dose aspirin.

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Journal Reference:

1. Nicola Veronese, Jacopo Demurtas, Trevor Thompson, Marco Solmi, Gabriella Pesolillo, Stefano Celotto, Tommaso Barnini, Brendon Stubbs, Stefania Maggi, Alberto Pilotto, Graziano Onder, Evropi Theodoratou, Alberto Vaona, Joseph Firth, Lee Smith, Ai Koyanagi, John P.A. Ioannidis, Ioanna Tzoulaki. Effect of low‐dose aspirin on health outcomes: An umbrella review of systematic reviews and meta‐analyses. British Journal of Clinical Pharmacology, 2020; DOI: 10.1111/bcp.14310