Derriford Hospital is currently on Red Alert and extremely busy after a surge in patients needing emergency care.
The hospital says a high number of patients have attended A&E, many of whom are acutely unwell and need to be admitted as medical emergencies.
The hospital says it put many measures in place to try to prevent the winter demand overwhelming their services - including increasing staff and working with the council's discharge team.
The hospital added on its website that they "apologise sincerely to those patients affected" by the measures, and that staff are working extremely hard to try to minimise the effect.
- If patients need non-emergency medical care, please contact your GP or, out-of-hours, NHS 111
- If you have an appointment at Derriford Hospital please attend as planned, unless contacted otherwise