Selena Gomez Is 'Trying to Turn a Negative Into a Positive' With Lupus Diagnosis

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Selena Gomez performs on NBC's "Today" at Rockefeller Plaza on October 12, 2015 in New York City. 

Selena Gomez played Today Monday morning in NYC, bringing Revival tracks like "Good for You," "Same Old Love" and "Me & the Rhythm" to scores of Selenators.

She also spoke with Today hosts Hoda Kotb and Matt Lauer, touching briefly upon her recent revelation that she'd gone to rehab for lupus treatment in a Billboard cover story.

Gomez says that while she's reluctant to talk about it in great detail, she appreciates that publicly addressing it might help fans with similar issues.

Billboard Cover: Selena Gomez on the New Chapter of Her Life

"To be honest, it still makes me uncomfortable to talk about it," Gomez said. "I feel I'm able to reach my fans and understand people when I am one on one and they're dealing with the same thing because I've been there. I'm trying to take something that's negative and turn it into a positive."

As for prepping for her upcoming tour, Selena said, "I gotta be healthy -- I shouldn't eat the things I do eat."

Watch her sing "Good for You" below.