The James Paget Hospital in Gorleston has been told again it must improve.
The Care Quality Commission has issued a formal warning saying it must do more to increase standards of care or face further action.
It follows an inspection at the beginning of March and is the third formal warning the Trust has received in the last year.
The James Paget Hospital in Norfolk has received its third official warning about the standard of care within the last year.
The Care Quality Commission's raised concerns about how well the trust was assessing the needs of patients.
The CQC also said the trust wasn't doing enough to make sure patients are receiving appropriate treatment. The James Paget has until the end of May to improve.
Cathryn Barmham, from the Care Quality Commission, said: "There are a number of actions we can take in respect of enforcement but the trust are making improvements and they are realising the significance of the concerns they have and as you are aware there have been personnel changed recently."
The new chief executive of the James Paget University Hospitals NHS Trust has vowed to improve standards of care for patients following a damning report from the Care Quality Commission (CQC).
It follows an inspection of the James Paget Hospital in Great Yarmouth, Norfolk.
David Hill, who joined the trust last, week said: “The challenges raised by the Care Quality Commission are my top priority.
"We welcome the fact that the CQC are driving up standards of bedside care across the country including this hospital.
"The James Paget fully accepts that the necessary pace of improvement here has not been fast enough and we should have responded more quickly."