NHS workers in Bristol and other parts of the region have been protesting about plans to scrap national pay scales in favour of local rates.
Unions fear that the plans by a group of 20 NHS trusts across the region could lead to pay cuts for nurses and other staff, and that other terms and conditions such as sick pay could also be cut.
The NHS says the plans are still out to consultation and not yet decided.
Several hundred health workers will demonstrate outside the Bristol Royal Infirmary and Musgrove Park Hosptial in Taunton later.
The protests are in opposition to plans by the NHS to change pay and conditions for workers from a national agreement to local deals.
Chris Bown who's chairing the South West Pay, Terms and Conditions Consortium which has sparked this row, spoke to Ian Axton on The West Country Tonight this evening:
It's shaping up to be one of the most divisive and controversial issues to affect the health service in decades.
Should health bosses here in the South West ignore national deals and set their own pay scales, terms and conditions?
Our health correspondent Rebecca Broxton reports on the growing anger of NHS staff:
Angry health workers in Bristol have been meeting to discuss their response to proposals to change their pay, terms and conditions.
20 health trusts across the South West have joined a consortium which wants to impose local deals. It could mean pay cuts, increased hours and a reduction in annual leave.
Unions say it'll force many workers to quit the NHS or move elsewhere. They say industrial action is a possiblity if the changes are implemented.