We don't think it would be too hyperbolic to say that Gigi Hadid had the best year ever in 2016. Among the many highlights, Gigi designed her very own fashion collection with Tommy Hilfiger, hosted the American Music Awards, and just slayed the runway of the Victoria's Secret Fashion Show.

But during her domination of the fashion world, Gigi shared that she has been dealing with her own health issues. "My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it," the supermodel revealed during an all-star panel on women's empowerment for Reebok's #PerfectNever campaign on Wednesday, as reported by ELLE. "So for the VS show I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good."

Hashimoto's disease is a condition in which your immune system attacks your thyroid, according to the Mayo Clinic. It is the most common cause of hypothyroidism in the United States.

But Gigi hasn't let her struggles slow her down one bit. "You know, I've never taken a sick day. I just realized!" she said. "I feel that pressure of not taking time for yourself because you don't want it to affect your professionalism."

@reebok @reebokwomen #PerfectNever #BeMoreHuman A photo posted by Gigi Hadid (@gigihadid) on Oct 4, 2016 at 10:54am PDT

Gigi is the face of Reebok's campaign, which aims to encourage women to better themselves, not seek perfection. Though Gigi may seem like the face of perfection to many, she emphasized during the panel that she has flaws just like everyone else. “It kind of seems strange that a model who’s supposed to be perfect is the face of the Perfect Never campaign,” Gigi said during the panel, as reported by The Cut. “People were like, ‘why her?’ That’s the point. Everyone always calls me perfect, and I’m just not, I’m like everyone else.”

Fans of The Real Housewives of Beverly Hills have followed Gigi's mom, Yolanda Hadid, during her battle with Lyme disease. Last season, Yolanda also shared that Gigi's younger siblings, Bella and Anwar Hadid, had also been diagnosed with Lyme disease.

Hear more about Yolanda and Bella's journey with Lyme disease, below.