Amazon Prime Video star Erin Moriarty has revealed she is being treated for Graves’ disease, an autoimmune disorder that causes the thyroid to over-produce hormones. In a candid Instagram post on 14 June, the 30-year-old actor—best known as Starlight in “The Boys”—told followers that “autoimmune disease manifests differently in everybody/every body,” adding she had mistaken months of nausea and exhaustion for stress until “a month ago” when doctors confirmed the diagnosis. “Within 24 hours of beginning treatment I felt the light coming back on,” she wrote, urging anyone whose own “light” feels dimmed to seek medical help.
Graves’ disease affects about one percent of Americans and is seven to eight times more common in women, according to the American Thyroid Association. UCLA endocrinologist Dr Whitney Goldner calls it “the most common cause of hyperthyroidism” and says medication, radio-iodine and surgery are all effective treatments, “but there’s no perfect choice—treatment has to be personalised”. Untreated, the condition can trigger serious cardiac or eye complications, yet most patients return to normal activity once hormone levels are brought under control.
Moriarty’s post drew a wave of supportive comments from cast-mates and fans, contrasting with online harassment she endured in 2022. Production sources say filming of the show’s fifth and final season—now midway through an extended Toronto shoot slated to run into mid-2025—is proceeding on schedule with Moriarty on set this week. Creator Eric Kripke has previously said the series would prioritise cast health over deadlines.
The disclosure adds to a recent spate of high-profile thyroid-health revelations, including “Star Wars” actor Daisy Ridley’s 2024 account of living with Graves’ disease, a trend physicians say is helping destigmatise endocrine disorders. “High-profile stories like Moriarty’s drive home that thyroid disease is both common and manageable,” Dr Goldner noted. “The earlier we catch it, the easier it is to treat, and people can get back to their lives and their work.”