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
Over 23,000 people have been enjoying the sun at Cumbria's biggest music festival, Kendal Calling.
Thousands of people have taken up the Total Warrior challenge. Today's endurance event was held in the Lake District.
Lucy Porteous from Kelso, has won a gold medal in the mixed doubles, & bronze in the singles at the LA games.