Nurses in Wales strike for second time in a week
It's part of a row over pay and working conditions
It's the second strike in as many days as hundreds of nurses across Wales walk out in a row over pay and conditions.
Those working at all but one Welsh health board are taking part in industrial action today.
Those in England and Northern Ireland will also be on picket-lines outside hospitals.
It's estimated as many as 10,000 nurses across the country are walking out.
The Royal College of Nursing (RCN) and the Government are locked in a bitter dispute over pay, with ministers saying the salary rise demanded by unions is unaffordable.
Over the weekend, Wales First Minister Mark Drakeford said there is no money available to be able to give nurses the increase they want.
Tomorrow (Wednesday) ambulance workers including paramedics, control room workers and technicians will also walk out in Wales and England with health chiefs warning this represents the most serious threat to date.
The RCN has been calling for a pay rise of 5% above inflation, though it has indicated it would accept a lower offer.
When it submitted the 5% figure to the independent pay review body in March, inflation was running at 7.5%.
But inflation has since soared, with RPI standing at 14.2% in September.
The Government has implemented the recommendations of the independent pay review body, which gave nurses a rise of about 4.75%, with a guaranteed minimum of £1,400.
The RCN has said it will still staff chemotherapy, emergency cancer services, dialysis, critical care units, neonatal and paediatric intensive care, as well as some other services.
Speaking ahead of the strike, RCN chief executive Pat Cullen said: "The Prime Minister should ask himself what is motivating nursing staff to stand outside their hospitals for a second day so close to Christmas.
"They are prepared to sacrifice a day's pay to have their concerns heard. Their determination stems as much from worries over patient safety and the future of the NHS than personal hardship.
"Rishi Sunak is under growing pressure in Westminster following last Thursday's strike and he should listen to people around him.
"The public is increasingly with their local nursing staff and this Government desperately needs to get on the right side of them. It is unprecedented for my members to strike.
"Let's get this wrapped up by Christmas. I will negotiate with him at any point to stop nursing staff and patients going into the new year facing such uncertainty.
"But if this Government isn't prepared to do the right thing, we'll have no choice but to continue in January and that will be deeply regrettable."