Sheryl Crow has a brain tumor, she revealed in a recent interview with the Las Vegas Review Journal. She said she has a history of forgetting her lyrics on stage, and that now she knows why.

"I worried about my memory so much that I went and got an MRI," she explained. "In November, I found out I have a brain tumor. But it's benign, so I don't have to worry about it."

Her rep says that the type of tumor the 5-year-old singer has is a Meningioma, which is typically benign and does not require surgery. Should she have been diagnosed with a Glioblastoma multiforme, which is a much more life-threatening type of tumor— Ted Kennedy, for example, died 15 months after being diagnosed— she would have much more reason to panic.

Crow reassured fans last night that she doing alright.

"Please don't worry about my 'brain tumor,' it's a non-cancerous growth," she wrote on her Facebook page. "I know some folks can have problems with this kind of thing, but I want to assure everyone I'm OK. I'm feeling very healthy and happy, and having a great time on the road playing with my new band. I'm busy working on my next record too, which I'm very excited about...and I'll be on The Tony Awards this Sunday. Really appreciate everyone's love and concern, I feel so blessed to have the support of all my fans, but I'm good - really!"

Crow underwent surgery and radiation therapy for breast cancer in 2006.