Sheryl Crow has tended to laugh off the onstage moments where she forgets lyrics, but it turns out her memory lapses were a sign of a serious medical issue. “I worried about my memory so much that I went and got an MRI,” she told the Las Vegas Review-Journal. “And I found out I have a brain tumor. And I was, like, ‘See? I knew there was something wrong.’”

Crow made the revelation during an interview with the paper on Friday. The diagnosis could have been a crushing blow for the singer, who has already survived breast cancer, but she clarified that her health is fine. “I haven’t really talked about it. In November, I found out I have a brain tumor. But it’s benign, so I don’t have to worry about it. But it gives me a fit.”

Last month, Crow forgot the words to ‘Soak Up the Sun’ during a performance and told the crowd, “I’m 50, what can I say? My brain’s gone to s—.”

Crow continues to perform live and plans to release a new album this year, the follow-up to her 2010 record ’100 Miles from Memphis.’ But first the nine-time Grammy winner and multi-platinum artist will have to find a label. “I don’t even have a record deal,” she said. “I probably will sign a record deal, though. I like the opportunity to be on radio.”

Watch Sheryl Crow Perform ‘Summer Day’ on ‘Live on Letterman’