Theresa May has been urged to "pause" plans to bring in a new junior doctors' contract after the issue led to an extended stand-off and planned strikes.
Elizabeth McAnulty of the Patients Association told ITV News that the prime minister should suspend work on the controversial new deal - as she previously did with the Hinkley point power plant.
She called on Ms May to "step in and stop this - pause it - until she's had an opportunity to really look at the facts" as patients face repeated strikes by junior doctors over the rest of the year.
Ms McAnulty said the impact of the strikes on patients would be "devastating" and they would lead to some 30,000 operations being cancelled.
The medical regulator has urged junior doctors to seriously consider whether or not to take part in a new wave of strikes.
A five-day strike by junior doctors has been called in the ongoing dispute over contracts, but what does it mean for patients?