Lord Tim Bell, the leading PR and advertising figure who was a close adviser to Baroness Thatcher, said she was expected to need several days of recuperation. It could mean she will spend Christmas in hospital, where she has been accompanied by her daughter Carol.
Lord Bell said the former politician had been in some pain earlier in the week and was sent by her doctor to hospital where it was decided the operation was required.
It was a short procedure using what was described as "minimally invasive surgery", he said."She's fine," he added.
More top news
Residents in a Lincolnshire village say potholes have become so bad, they are having to fork out thousands of pounds in car repair bills
Doncaster RFC have announced their prop Ian Williams has passed away after collapsing at training.
A man has been sentenced to eight years in prison after after being found guilty of raping a woman in Sheffield.