Thousands of ambulance workers are going on strike today in their ongoing dispute over pay and staffing.
The strike will involve more than 11,000 members of the GMB union in England and Wales, along with some members of the Unite union.
It comes as the number of health workers taking industrial action continues to grow, with junior doctors set to go on strike next month.
Speaking on behalf of ambulance workers, GMB national secretary Rachel Harrison said they will walk out "because this government is tin-eared".
"It has been over a month since the government engaged in any meaningful dialogue," she said.
"They are missing in action and refuse to talk pay."
She added: "Solving the issue of pay is vital if we're going to stem the tide of dedicated healthcare workers leaving the profession."
Health and Social Care Secretary Steve Barclay said: "Strikes are in nobody's best interests and only cause further disruption for patients, despite contingency measures in place.
"It is time unions engaged constructively with the pay review body process for 2023/24 and cancelled strikes so we can move forward and continue tackling the COVID-19 backlog.
"I've been clear throughout that I remain keen to keep talking to unions about what is fair and affordable for the coming financial year, as well as wider concerns around conditions and workload so we can make the NHS a better place to work."
Nurses will continue their action with a 48-hour strike starting on 1 March, with the Royal College of Nursing saying it has received £250,000 in public donations since starting its campaign in December.
RCN general secretary Pat Cullen said: "There isn't a person in this country whose life hasn't been impacted by a nurse and that's why the public are with us every step of the way."