Erin Moriarty has been diagnosed with Graves' disease, the actress announced on Instagram Friday. Moriarty shared a text message in which she detailed her symptoms and a series of selfies along with a caption in which she encouraged her followers to "go get checked" if they experience similar symptoms.

"If I hadn't chalked it all up to stress and fatigue, I would've caught this sooner," the actress said of the autoimmune condition, which causes the overproduction of thyroid hormone.