Tens of thousands of nurses and ambulance staff walked off the job on Monday in the largest strike in NHS history over low pay and working conditions.
This is the first time both groups have gone on strike on the same day during the ongoing wave of disputes affecting the NHS.
The Royal College of Nursing (RCN) staged two days of action, while ambulance crews and call handlers are expected to strike again on Friday.
NHS Providers, the body representing trusts, urged the public to use emergency services "wisely" and warned of approaching crunch point for the service.
The government has refused to adjust to the main point contention - pay for 2022/23 - which has led to ministers insisting that they cannot afford "inflation-busting pay rises".
NHS workers went on strike in England in the largest walk-out in the history of the NHS over low pay and poor working conditions.
The Royal College of Nursing has said that the strikes will continue indefinitely, with a "constant cycle" of industrial action.
The strikes, which are part of an ongoing wave of disputes, have led NHS providers to urge the public to use emergency services wisely, as the service approaches a "crunch point".
While the RCN has staged two days of action, ambulance crews and call handlers are due to strike again on Friday.
While the strike reflects increasing unhappiness among NHS workers over pay and working conditions, the government refuses to adjust the main contention point for 2022/23, insisting that that they cannot afford inflation-busting pay rises.