India, Jan. 16 -- John Mellencamp has shared an update on daughter Teddi Mellencamp's health, saying she is currently struggling amid her fight with stage 4 cancer.

The 74-year-old musician spoke about Teddi's condition during an appearance on the Joe Rogan Experience podcast on Wednesday. Mellencamp said his youngest daughter is "really sick" as she is battling cancer that has spread to her brain.

"It's not f-king fun," Mellencamp said, as quoted by Page Six. "She's got cancer in the brain, and she's suffering right now."

During the podcast, Mellencamp also spoke briefly about Teddi's personality while growing up, recalling how she often sought his advice.

"That kid used to call me up and I'd go, 'Teddi, you can have a thought withou...