Certain blood types may increase risk of early stroke: Study

Technology Dec 11, 2025

A new study suggests people with the A1 blood type might have a slightly higher risk of having a stroke before age 60—about 16% more compared to others.
Researchers looked at data from thousands of people aged 18 to 59, so this isn't just a small sample.

What else you should know

Don't panic if you're type A—the researchers say the increased risk is pretty small and there's no need for extra screening right now.
Interestingly, folks with the O1 blood gene actually had a lower stroke risk.
The study mostly included people of European descent, so scientists say we need more diverse research to really understand how blood type affects stroke risk for everyone.