An attempt to protect Queensland Health's systems from being affected by the WannaCry ransomware attack appears to be causing problems for clinicians logging in to the integrated electronic medical record (ieMR) at five Queensland hospitals.

The issue was not caused by an actual cyber security attack, eHealth Queensland says, and emergency departments and theatres are running as normal.

Update: eHealth Queensland issued a statement this afternoon saying the problem may have to do with extra measures taken to protect systems against WannaCry on May 13.