The Welsh Government says there has been "a significant increase in emergency pressures during the last week."
It says some staff have been redeployed to help out in A&E departments.
To help manage the pressures, NHS Wales has held Daily Executive Conference calls. Chaired by the Welsh Ambulance Service they include all Local Health Boards and Welsh Government Officials.
The NHS has been reprioritising some of their clinical staff to help with the pressures, for example, GPs and local Primary Care teams have been actively involved in supporting hospitals by managing patients where ever possible in their communities.
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