Crow fears cancer struggle isn't over

Sheryl Crow's cancer studies are starting to make her paranoid that she will never really be free of the disease.

The rocker fought breast cancer earlier this year and has since been given the all-clear by medics, but studying the disease that devastated her has left her fearing the worst about her future health.

She explains: "I dug into the Internet and tried to educate myself as to what I was looking at. Even though you're treated and you're doing all the things that you are being told to do I still wake up sometimes feeling like: 'Is this going to come back?'

"The more I read about cancer, the more frightening it really is. There's so many different kinds of breast cancer. There's so much that we don't know."