Ayr Hospital is bursting at the seams with patients.
A rise in the number of A&E admissions during December has swelled numbers beyond the expectations of health chiefs.
A mix of Ayrshire’s ageing population and poor health has been blamed.
Liz Moore, director for integrated care and emergency, said: “We have no more room.”
The NHS official was speaking at a board meeting on Monday and told how it was a similar picture at Crosshouse Hospital.
Extra beds have been put into both hospitals to try and cope with demand.
She said: “There is no specific reason but an explanation is people are older and have been presenting with respiratory diseases, diarrhoea and vomiting.
“At Ayr we have seen about 60 per cent of those presenting in the over 65s. That mirrors the picture in Scotland.”
She said Ayr A&E has seen a rise in admission rates of around 3000 people over the last two years.
Ms Moore says it also means a target of having 98 per cent of people wait a maximum of four hours has been missed.
She said the rate during December was 88 per cent, the lowest it had been since 2007.
She added: “At this moment we are still full at both sites but there are no patients waiting.”
The board was told that a new way of working was being looked at in Crosshouse to try and lower the number of people being admitted to hospital after coming into A&E.
Ms Moore said a physician was being stationed at the front administration so that people could be assessed quicker and turned away if they didn’t have to stay.
Some board members blamed “unhealthy lifestyles” for the rise in hospital admissions in the meeting heard NHS Ayrshire and Arran was in the top three worst in Scotland for most of the major diseases.