Managers of the Royal Cornwall Hospitals Trust have been ordered to make urgent improvements to protect the safety of patients.
The Care Quality Commission found staffing levels inadequate at times in its emergency department during an inspection in June.
Surgery was rated good, but inspectors also found wards full with patients waiting for support systems to be arranged.
The hospital says is is already making improvements.
A report by the Care and Quality Commission (CQC) has found that, out of hours GP services in Cornwall are not meeting the required standards. Our reporter Kathy Wardle, spoke to Mary Cridge from the Care Quality Commission, who says this is 'simply not good enough'.
Andrew George was one of the MPs who referred the allegations to the Care and Quality Commission (CQC).
The company that provides out of hours doctors in Cornwall and the Isles of Scilly has been told they need to improve services. In a report published today, The Care Quality Commission says that Serco was not meeting four of the essential standards of quality and safety.
That included safeguarding people from abuse, qualified and experienced staff, assessing and monitoring the quality of service provision and accuracy of data. It follows inspections in April and May. It's been given 2 weeks to state how it will achieve standards.