Bosses at Addenbrooke's in Cambridge say Accident and Emergency patients can still expect quality care despite the hospital being placed on black alert.
A shortage of staff's meant that the hospital's found it hard to move people on from A and E to other departments. However, managers at the trust have called for calm.
"Largely we're able to turnaround over 90% of them (A and E patients) in good, short order and those that do have to wait - they are cared for well within the emergency units," Dr Keith McNeil, Chief Executive of Cambridge University Hospitals said.
"So, in terms of clinical quality and care - there's no impact at all."