More than 1,100 members of staff in the HSE West area which includes Donegal call in sick every day.
The total represents 5% of the 22,000 staff who work from here to Limerick.
And it costs the HSE €5M a month - the figures were released at the HSE West monthly forum.
The HSE is responding to the figures by introducing an 'absenteeism management' system.
Cllr Ciaran Brogan, who is member of the HSE West Regional Forum, said while the figures are startling, it must also be taken into consideration the stresses and pressure people working in the health service are under.......