The Welsh Health Minister, Mark Drakeford, has ordered an independent review into Abertawe Bro Morgannwg University Health Board.
It'll pay particular attention to the Princess of Wales and Neath Port Talbot Hospitals.
In the past the health board has said it's made improvements at the hospitals with more nurses and better training.
The Public Services Ombudsman's report into the death of a dementia sufferer four months after he was admitted to a hospital in Swansea has found a 'pattern of failures.'
Abertawe Bro Morgannwg University Health Board has apologised and says major changes have taken place at Cefn Coed Hospital since then.
The Healthcare Inspectorate Wales says it's now considering strengthening its risk assessment and inspection process.
Here's our Health Reporter Rob Osborne.
'We've seen a number of cases where people at the end of their life have not been cared for properly," says Public Services Ombudsman Peter Tyndall.
"I think there are instances where cultural change will be called for. In many cases there is excellent care being provided, but there are still isolated cases of this kind that need to be tackled."
The distress of the family in losing a loved one is a matter of great concern. I think for them this is something that will always remain with them and it does again stress the importance you have to look after people at the end of their lives well.
"I am confident that the changes can be made and will be made, but I think it requires sustained management attention to make sure that we don't slip away from the standards that need to be sustained."
Abertawe Bro Morgannwg University Health Board says it "strives to continually improve" the care it offers vulnerable patients.
It says the ward in which Mr was treated has now been replaced by a purpose-built dementia unit, and that the hospital now has "better mechanisms in place to assess and serve patients' nutritional needs".
More needs to be done to care for elderly people in hospitals that are coming to the end of their lives, according to the Public Services Ombudsman for Wales.
It comes as a report is published today revealing 'a pattern of failures' in the care of a man with dementia who died four months after being admitted to Cefn Coed Hospital in Swansea.
Abertawe Bro Morgannwg University Health Board, which was criticised in the report, says it has overhauled some parts of its service since 2009 when the man died - and in the area of bed sore prevention it is now a world leader.
Plans to move some maternity services from North Wales to the Wirral have already caused a series of protests.
This evening, demostrators gathered outside the offices of the Health Minister Lesley Griffiths.
Our North Wales reporter Ian Lang was at the demonstration.
Communities across Wales have seen a day of angry protest as families, students and the disabled have demonstrated about cuts to their services
Proposed changes at Bridgend's Princess of Wales Hospital brought more than 200 people on to the streets of the town.
David Wood reports.