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.
More top news
A parent is arrested every day on suspicion of leaving one or more of their children at home alone, new figures reveal.
A son who stole thousands of pounds from his elderly mum to fund a gambling addiction was caught after boasting on Facebook.
Around 150 people turned out in Crickhowell High Street to oppose plans to convert a pub in the High Street into a convenience store.