Study: Why a common painkiller could cause bleeding in the skull, who’s at greatest risk

Do you take aspirin to prevent heart attacks and strokes? It could lead to bleeding in the skull, according to a new report.

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Researchers from health institutions in Taiwan and California recently conducted a study, published in JAMA Neurology, to determine the association between low-dose aspirin and bleeding in the skull.

To do so, they examined 13 previous studies that observed more than 130,000 adults, aged 42 to 74. The subjects, who did not have a history of heart attack or stroke, were prescribed low-dose aspirin of 75 to 100 milligrams or a placebo to prevent these conditions.

After analyzing the results, they found those who took the placebo had a 0.46% risk of head bleeding. Those on the low-dose aspiring had a 0.63% risk, which was the equivalent of 2 out of every 1,000 people.

Explore>> Related: Is aspirin worth the risk? Study links aspirin to increased bleeding

The authors noted those of Asian backgrounds and those with a body mass index under 25 had the greatest risk.

"The absolute magnitude of these adverse effects is modest, but clinically relevant," study co-author Wen-Yi Huang said in a statement. "Given that the many individuals in the general population have a very low risk of atherosclerotic cardiovascular events, if low-dose aspirin is given universally, adverse outcomes from intracranial hemorrhage may outweigh the beneficial effects of low-dose aspirin."

In March, new guidelines from the American Heart Association (AHA) recommended most older adults should no longer take a low-dose aspirin every day to prevent a heart attack or stroke.

Explore>> Related: Daily low-dose aspirin for heart attack or stroke no longer recommended for older adults

The AHA released the findings of a clinical trial that found aspirin did not prolong life in elderly adults who do not have the highest risks of heart disease. That study also said aspirin could possibly lead to major bleeding in the elderly.

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