Medical experts pass pressures connected wellness services are expected to get worse successful January amid the "hardest wintertime ever".
Dr James Gagg, from the Royal College of Emergency Medicine, said it "hurt" to spot radical "coming to harm" owed to pressures.
South West A&E departments person been "under unthinkable pressure".
The authorities said it was expanding NHS capableness by the equivalent of 7,000 beds nationally to help.
The Royal Cornwall Hospital has been operating astatine captious incidental level since 20 December.
Dr Gagg, southbound westbound seat of the Royal College of Emergency Medicine, said harm was being caused to the wellness of radical waiting for ambulances and patients waiting to beryllium admitted to hospital.
"It hurts to spot that radical are coming to harm, and to spot radical coming successful sicker than they needfully should person been due to the fact that of immoderate of these problems that are occurring," helium said.
Dr Gagg said helium had spoken to paramedics who had arrived astatine scenes to find patients had "already passed away".
He said "significant delays" were expected to get worse.
"Unfortunately what we're expecting is for the concern to deteriorate successful the weeks and months ahead."
Dr Toby Slade, exigency section advisor and subordinate aesculapian manager for urgent attraction astatine the Royal Cornwall Hospital said: "This wintertime has been the hardest ever, and that's a precise precocious bar.
"We cognize that patients who are treated successful departments that are crowded are astatine accrued hazard of harm...
"We effort and bash everything we tin successful a section to mitigate that... But we cognize that these pressures volition person an interaction connected diligent care," helium said.
Eighty-two-year-old Marie Grubb from Wadebridge waited 31 hours for an ambulance aft she fell connected her room level and broke her pelvis.
She said "willpower" had helped her done the clip she had to wait.
"This hold successful ambulances is the problem, erstwhile you get successful present it's moving similar a imagination really, but I don't cognize what's going connected with them down the scenes, they indispensable beryllium tally disconnected their legs," she said.
Dr Slade added determination was an urgent request to enlistee much carers to easiness the pressures facing our hospitals.
Nigel Acheson, NHS Devon's main aesculapian officer, said a "constellation" of flu, Covid, norovirus, Strep A and different respiratory infections had caused "pressure", exacerbated by unit sickness.
He added the request to abstracted Covid and flu patients had further analyzable the issue.
Mr Acheson said hygiene measures including hand-washing, arsenic good arsenic taking up flu and Covid vaccinations, would assistance and predicted the pressures would easiness successful the spring.
Both helium and Prof Mark Hamilton, aesculapian manager astatine University Hospitals Plymouth NHS Trust, appealed to the nationalist to "think carefully" earlier attending exigency departments.
The authorities has said it is expanding NHS capableness by the equivalent of 7,000 beds, with a £500m money to amended infirmary discharge times and a £150m for the ambulance service.
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