Dolly Parton is clearing the air after being dogged by rumors about her health ... and she says she isn't on her deathbed.

The singer-songwriter directly addressed fan concerns Wednesday in a lengthy post on social media ... saying she wants to put people's minds at ease. She says she's got some "problems" ... but says she's still working her butt off in Nashville. Gallery Launch Gallery Getty

Dolly says she's having a few medical treatments ... but clarifies she's not dying.

As you know ... folks flew into a panic Tuesday after Dolly's little sister Freida went on Facebook asking for prayers for Dolly and saying DP "hasn't been feeling her best lately."

Fans were worried, and rightfully so ... Dolly developed an infection from a kidney stone last month and she also re

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