Waikato Hospital is at "overload" and having to reschedule surgery and turn away non-emergency patients from the hospital's emergency department.
Hospital bosses are blaming the start of winter and influx of patients through the ED who are then being admitted to hospital.
The situation has sparked claims of a "crisis" on social media, with suggestions any patient who does not have a life-threatening injury or disease is now being discharged by the hospital into the care and management of their GP.
"Waikato Hospital is in overload and above capacity which is leading to increased numbers of patients waiting in our ED for an inpatient bed," said clinical director general medicine Dr Douglas Stephenson.
"Because of this situation and for the safety of our patients we are having to reschedule patients for elective surgery that are not cancer or emergency type surgeries.
"Doctors and nurses are doing everything they can to attend to patients care in a timely manner.