The 72-year-old musician’s daughter recently disclosed that a fun family night resulted in an unexpected revelation that startled his loved ones and online users.

In an interview with People on April 30, 2025, Michael Bolton’s daughter Taryn Bolton announced that the Grammy-winning singer was given a diagnosis of glioblastoma, a rare and aggressive kind of brain cancer.

The initial indications surfaced on a family outing to bowl shortly after Thanksgiving 2023. Taryn described her father’s habit of bowling out of turn as “super weird.”

Earlier that evening, he had suddenly fallen from his chair. “He fell out of his chair to the left, which is very unusual. He’s super athletic, and he doesn’t drink,” she said. “So he fell, and we were like, ‘What just happened?’”

Despite their worries, Taryn and her sisters, Holly and Isa, first blamed the symptoms—which included nausea and trouble balancing—on stress and fatigue at a charity event in November 2023. Michael continued to be active in his career at the time, going on tour, making a cameo in a movie, and promoting a new album.

That weekend, Michael went to the hospital after getting a really bad headache. A brain tumor discovered via an MRI was completely removed by doctors. Pathology verified that it was glioblastoma (GBM) a week later.

In January 2024, he made the news public by posting on Facebook that the tumor had been found shortly before the holidays. He thanked fans for their ongoing support and announced a brief sabbatical from touring while recuperating at home.

The most prevalent kind of malignant brain tumor in adults, GBM progresses quickly and is challenging to treat, according to the Cleveland Clinic. It has no known treatment, spreads swiftly, and invades healthy brain tissue.

Headaches, memory or speech problems, seizures, and personality changes are some of its typical symptoms. Even though therapies like radiation, chemotherapy, and surgery can prolong longevity and enhance quality of life, cancer nearly always returns.

Memorial Sloan Kettering physician Dr. Ingo Mellinghoff stressed that malignant tumors can potentially cause modest behavioral changes and problems with coordination. Even though many of the indications are subtle, he warned that they shouldn’t be disregarded.

“Speech is pretty sensitive. We all have our speech patterns, and if all of a sudden your friend says, ‘It sounds so strange, and it doesn’t make sense,’ that is definitely something,” he explained.