Kym Marsh needs surgery to deal with her "painful" pelvis.
The "Coronation Street" actress will go under the knife to correct an "overgrowth of bone" which is causing her "discomfort".
She said: "I've had pain in my pelvis for a while now. I recently went for an MRI scan and I've been told I have a bone spur on the tip of my coccyx.
"It's basically an overgrowth of bone, which is pushing into muscles and tendons and causing me discomfort.
"I have to have a procedure done to correct it."
But the 42-year-old star is still able to exercise, and is searching for a new personal trainer so she can get summer ready.
Writing in her OK! magazine column, she added: "I'm told exercising won't cause it any damage, so I'm looking for a new personal trainer and hope to be in shape again by summer."
Last month, Kym - who plays Michelle Connor in "Corrie" - was bed-ridden for four days with suspected salmonella poisoning, and felt as though she had been "hit by a truck".
She said: "I felt so awful I had to go to the Alexandra Hospital in Manchester. I was shaking, I felt terrible and like I'd been hit by a truck.
"They ran lots of tests on me and I'm still waiting for the results, but doctors think it could be salmonella poisoning, which is really serious. The ordeal has been terrifying and I've never felt so ill.
"I was bed-ridden for four days. The whole family rallied around me, David and Emilie had to get Polly up and ready for school because I couldn't get out of bed."