Almost 100 children and young people in the midlands have been waiting over a year for access.
Mental health services are at breaking point across the country due to lack of staff and burnout.
SIPTU says it's imperative staffing is dealt with as a matter of urgency to prevent people leaving the sector.
The trade union says staffing issues are particularly acute in the Child and Adolescent Mental Health Services.
Figures from the HSE show 93 children and young people in Health area CHO8, which includes Laois, Offaly and Westmeath, have been waiting over a year for mental health services.
SIPTU's John McCamley says, in some cases, only half the staff required to provide services are available to work:
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