NHS Scotland staff are working "way beyond" their contracted hours and are struggling to provide quality services, a union has warned.
Unison has written to Health Secretary Humza Yousaf to raise a number of concerns around staff welfare.
These include high staff turnover, the availability of meal breaks and workers feeling exhausted at the end of the day.
The union is seeking a meeting with Mr Yousaf to discuss the issues.
Willie Duffy, Unison Scotland's head of health, said: "The current and constant demands on staff are taking their toll and staff are struggling to continue to provide safe and quality services.
"We are finding that staff are unable to take their meal breaks on a regular basis.
"They are working way beyond their contracted hours and working overtime shifts to keep services afloat.
"The NHS family have given everything over the past few years to ensure the best level of patient care possible.
"But this is unsustainable in the longer term and something has to give to allow staff to be able to function without the pressures that they are currently under.
"Action must be taken to support staff as many are burnt out and this cannot continue.
"We have reports from across Scotland of staff worried about how much longer they can keep providing the very best levels of care."
A Scottish Government spokesperson said: "We recognise the additional pressure NHS staff are facing as they work tirelessly to respond to the pandemic whilst continuing to provide vital treatment and safe patient care - and we are in daily contact with boards facing the greatest challenges and are monitoring the situation closely.
"Although pressures directly related to Covid have eased over recent months, as restrictions relax we have seen a rise in non-Covid attendances and admissions.
"We are delivering record funding of more than £16 billion in 2021-22 to support NHS Scotland and staff through the most challenging period in history and we have had multiple meetings with trades unions, including Unison, representatives this week alone.
"The Cabinet Secretary would be happy to meet Unison. We will respond directly to the letter when it is received."
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