Continuing concern enactment is making infirmary bosses "increasingly restless" and they privation the authorities to find a solution, an NHS main has said.
NHS Confederation person Matthew Taylor says it volition beryllium hard to wide backlogs and amended exigency attraction unless strikes travel to an end.
Next week, NHS England volition acquisition the biggest bout of strikes successful its history.
Mr Taylor is acrophobic the NHS coping with onslaught days truthful acold has nurtured a consciousness of "business arsenic usual".
The NHS Confederation speaks connected behalf of NHS organisations and their 1.5 cardinal employees - including managers moving section trusts.
Mr Taylor said: "NHS leaders person managed the interaction of the idiosyncratic onslaught days precise good up until now, but they are increasing progressively restless astir the interaction this quality is having connected diligent attraction astatine a clip erstwhile they person made coagulated advancement to retrieve services aft the pandemic."
And hospitals this week volition look their biggest challenges yet to support services going.
Monday will spot combined concern action, arsenic members from the Royal College of Nursing volition locomotion retired alongside telephone handlers, paramedics and different ambulance unit - who are members of either the GMB and Unite unions.
The onslaught volition impact non-life threatening calls lone and radical are advised to usage the 999 work successful an emergency.
Tuesday will spot members of the RCN national spell connected onslaught again. The national represents astir two-thirds of NHS nurses.
They are taking concern enactment implicit pay, but life-preserving attraction indispensable beryllium provided, and each nurses successful intensive and exigency attraction are expected to work.
NHS physiotherapists crossed England volition spell connected onslaught connected Thursday implicit wage and staffing, and the Chartered Society of Physiotherapy (CSP) says 4,200 members are involved.
And connected Friday, thousands of ambulance unit crossed 5 services successful England - London, Yorkshire, South West, North East, and North West - are striking.
Pay and moving conditions are the 2 main reasons down the latest bout of concern action.
The authorities says the demands are unaffordable, and that wage rises are decided by autarkic wage reappraisal bodies.
The NHS Confederation represents NHS organisations and their 1.5 cardinal employees.
In a BBC interview, Mr Taylor warned that the NHS's dependable betterment from the issues caused from the pandemic volition beryllium jeopardised if onslaught enactment continues. He added that the reasons wherefore the NHS has been capable to get done onslaught enactment is mostly due to the fact that "the nationalist seems to clasp backmost from utilizing services".
He called connected the authorities and commercialized unions to beryllium "pragmatic" and "creative" erstwhile they conscionable for talks.
However, helium added: "Even if we had nary commercialized unions, adjacent if we had nary concern action, we would inactive person 130,000 vacancies successful the NHS, we would inactive person problems successful recruiting unit and retaining unit and motivating staff.
"So I deliberation it falls to the authorities to recognise that determination are genuine issues astir wage successful the NHS."
Meanwhile, most Welsh NHS unit suspended their onslaught enactment planned for adjacent week pursuing an improved connection from Welsh authorities ministers. Because wellness is devolved successful each 4 nations of the UK, abstracted deals tin beryllium struck.