Watch: Camilla Luddington Missed Her "Grey's Anatomy" AuditionCamilla Luddington is opening up about her medical journey. The Grey's Anatomy star shared that she was diagnosed with Hashimoto's thyroiditis, explaining that the autoimmune disease-which causes low levels of thyroid hormone in your body, per the Cleveland Clinic-is in part responsible for how tired she felt all the time. "As long as you've been listening to us, you've known that I joke about being slothy," Camilla explained on her iHeartRadio Call It What It Is podcast Aug. 6. "Slower, tired. Wanna be in bed. Love a nap.