Reid said fewer patients than usual had been discharged from hospital on Monday, leaving beds occupied for longer.
This created a backlog that spread through the hospital as emergency admissions continued to rise.
“We do not want patients cared for in corridors. That’s not an appropriate way of delivering care,” she said.
In response, managers reviewed discharges across wards, brought in additional staff and increased capacity where possible to ease pressure.
Manx Care also cancelled 19 non-urgent procedures, while retaining services for cancer patients and children.