Over 17,000 people are now on waiting lists at Sligo University Hospital according to the latest National Treatment Purchase Fund report.
More than 2,500 patients have been waiting over a year for their first outpatient consultation.
Dermatology is the most delayed service, with over 1,200 adults facing year-long waits.
Speaking to Ocean FM News, Cllr McSharry says a lack of consultant cover last year led to the backlog.