The 89-year-old actress, who plays Rovers Return barmaid Betty Williams, is being treated in a private clinic.
The TV favourite - famed among Corrie fans for her hotpot - is understood to be keen to return to work, and her co-stars have sent get-well wishes.
A Weatherfield source said: "She is probably the most popular person in the cast.
"Everyone wants her to get well and get back on set."
Betty is the show's oldest cast member, and has been in the soap since 1969.
A soap spokesman declined to give details of her condition, adding: "It is a private medical matter."