Thirty patients and three members of staff are believed to have contracted the norovirus.
Hospital managers are now urging people to take all the usual measures to stop the problem from getting worse.
Infection Control Manager Elaine Ross explains more:
More top news
10,000 children have increased their chances of avoiding flu this winter after a county council campaign saw figures soar by 40%.
A look ahead over the festive period.
Boxes of Hope, Cumbria, the charity which gets local communities together and helps deprived children in Eastern Europe.