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Taylor Swift has revealed that her mother, who is being treated for breast cancer, has also been diagnosed with a brain tumor.

The pop star told Variety that doctors found the tumor while her mother, Andrea Swift, 62, was undergoing chemotherapy treatments for the breast cancer.

"And the symptoms of what a person goes through when they have a brain tumor is nothing like what we've ever been through with her cancer before,'' Swift said. "So, it's just been a really hard time for us as a family."

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Swift, 30, revealed her mother had breast cancer in 2015. She paid tribute to Andrea Swift last year on her album "Lover" with a touching song called "Soon You'll Get Better" in which she opened up about how her family has been dealing with her mother's diagnosis.

“And I hate to make this all about me/ But who am I supposed to talk to?/ What am I supposed to do?/ If there’s no you,” Swift sings.

“We as a family decided to put this on the album, and it’s something I’m so proud of, but it’s just really hard,” she said during a YouTube Live event last year. “I can’t sing it. It’s hard to just emotionally deal with that song.”

The cancer returned last year after her mother was initially treated in 2015, Swift wrote in an essay for Elle magazine in March.

"It’s taught me that there are real problems and then there’s everything else,” she wrote. “My mom’s cancer is a real problem. I used to be so anxious about daily ups and downs. I give all of my worry, stress, and prayers to real problems now."