A woman who was brought to North Shore Hospital by ambulance was punched in the face by another patient, as they waited to get into the overcrowded emergency department.
The assault is understood to have happened on Tuesday night, after the man was brought to the hospital by police officers who then left.
The man also threw things around and abused a nurse, before punching the patient, knocking her to the ground.
College of Emergency Nurses and the Nurses Organisation spokesperson Sue Stebbings spoke to Corin Dann.