The study found almost 7 percent of men 65 and older who have a prostate biopsy are hospitalized within 30 days of the procedure.
The increase in hospitalizations wasn't just for reasons that are clearly related to the biopsy itself.
Scientists say, while the rate of infections increased significantly, there were also some hospitalizations related to flare-ups of heart failure and pneumonia. They say that means something about the biopsy is causing people to get sick.
The study in the Journal of Urology says doctors need to be made aware of this possibility.