Sheryl Crow says she has been diagnosed with a benign brain tumor after forgetting the lyrics to some of her hits while performing.

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"I worried about my memory so much that I went and got an MRI. And I found out I have a brain tumor," the American singer-songwriter, 50, told the Las Vegas Review-Journal.

"And I was, like: 'See? I knew there was something wrong,'" she said. "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."

The newspaper said Crow's condition doesn't seem to be slowing her down. She is working on a new album, as well as writing a stage musical version of "Diner" with Barry Levinson, the writer-director of the 1982 film.