Hospitals in the east and south of the country were the most heavily impacted.
More than 50,000 operations and procedures have been cancelled in the first three months of the year.
HSE figures show hospitals in the east and south of the country were worst hit, amid an overcrowding crisis.
The Dublin Midlands Hospital Group came out on top with almost 10,000 cancellations from January to March, followed by Ireland East Hospital Group.
Stephen McMahon from the Irish Patients Association, says the issue could be much worse at this point of the year:
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