Winter viruses are causing high levels of activity.
The three midlands hostpitals are asking the public to consider their options if they have a minor ailment.
The HSE say hospitals in Mullingar, Portlaoise, and Tullamore are experiencing high levels of activity due to the high prevalence of winter viruses at the moment.
Influenza levels are thought to be at their peak now, but illness rates are expected to remain high for the next number of weeks.
The health service are asking people to remember the availability of Injury Units, GP services and pharmacies over emergency departments.