People in the Northern Sound region have been advised that "long delays are to be expected" at Cavan General Hospital's Emergency Department.
It's due to a "significant increase in attendances" and a "prolonged period of increased activity".
Those with non-emergency needs are asked to seek alternative medical assistance from a GP or pharmacy.
Cavan General Hospital adds that inpatient bed capacity is currently affected by increased cases of Covid-19 on site.
It's requested the public's "continued support in hospital avoidance where possible" and has thanked the public for its support.