Dolly Parton has cancelled her previously postponed Las Vegas residency because of health challenges that leave her feeling "swimmy headed" — but has assured fans her ailments are treatable.

"The good news is I'm responding really well to meds and treatments, and I'm improving every day," the 80-year-old country superstar said in a short video posted to her official Instagram account. "Now, the bad news is, it's going to take me a little while before I'm up to stage-performance level, because some of the meds and treatments make me a lit bit swimmy-headed, as my grandma used to say."

"And, of course, I can't be dizzy carrying around banjos, guitars, and such on five-inch heels — and you know that I'm going to be wearing them," she joked. "Not to mention, all those heavy rhinestone outfits, the big hair, my big … uh, personality. Lord, those — that would make anybody swimmy headed!"