Gomez first opened up about having lupus in a 2015 interview with Billboard magazine, over a year after she checked herself into rehab.
"I was diagnosed with lupus, and I’ve been through chemotherapy," she disclosed. "That’s what my break was really about. I could've had a stroke."
Gomez said the speculation around her recovery did take a toll on her. "I wanted so badly to say, 'You guys have no idea. I'm in chemotherapy. You're a**holes,'" she exclaimed. "I locked myself away until I was confident and comfortable again."