NHS workers are staging a four-hour strike today in a row with the Government over pay.
Midwives, nurses, radiographers, paramedics and psychiatric staff will walk out in protest at the Government's refusal to accept a recommended 1% wage rise for all NHS employees.
NHS England said "robust plans" were in place to protect patients during the strike.
Unions have accused the Government of lying over NHS pay as health workers across the country take to the picket lines.
The Government said it had put forward plans to guarantee all staff would get at least 1% this year and next, but they had been rejected by the unions.
Unison leader Dave Prentis said: "It's ludicrous that the Government is keeping up the pretence that all staff are getting a 1% pay rise, and it doesn't matter how often they say it; it's simply not true."
He said the 1% pay rise recommended by the independent NHS Pay Review Body for all NHS workers had been rejected by the Government.
A Department of Health spokesman said: "NHS staff are our greatest asset and we want to make the current pay system fairer - which is why we have put forward proposals that would guarantee all staff would get at least a 1% pay rise this year and next, but these have been rejected by the unions.
"We have taken tough decisions to increase the NHS budget, but we can't afford a consolidated pay rise in addition to increments without risking 10,000 frontline jobs."
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