The Boys star Erin Moriarty opens up about a heartbreaking health struggle during season five

Erin Moriarty – who plays Starlight in The Boys – has shared she was struggling with her health while filming season five episode four.

The actor was diagnosed with the autoimmune condition Grave’s disease in May 2025. Her health issues became particularly challenging during production for the season five episode King of Hell.

Erin Moriarty wrote on her Instagram story: “So, season five, episode four of The Boys is one of the most important episodes I’ve ever shot. Unfortunately, that part of the season coincided with my health issues peaking before my diagnosis.”

Erin Moriarty as Starlight in The Boys season five episode four
(Image via Prime Video)

Erin shared a photo of her sitting in her car, with her knee bandaged.

“I’m saving you the gnarly part of this picture, but not long after this episode, I started to lose the ability to walk. The numbness in my feet led to a lot of falling. The night before we shot my segment of this episode, I fell and shredded up my knee.

“I barely have any behind-the-scenes shots of this season, especially as things worsened. This isn’t a pity post. Its mostly to say: f**k autoimmune disease. F**k it so hard. F**k the ignorance surrounding it, too. I can’t remedy that ignorance, but not being outspoken about it occasionally, feels wrong.”

Most Read

Revealed: The awful screenshot ‘receipts’ of texts Bec sent about other MAFS brides

Horrific details emerge as ‘headless body’ of mob boss son is found following kidnapping

Here’s when I’m A Celeb South Africa 2026 was filmed and the reason it’s not live

(Image via Instagram)

When someone has Grave’s disease, their immune system is producing antibodies that make their thyroid create too many hormones. This can cause muscle weakness, tiredness, weight loss and heart palpitations.

Erin Moriarty has been open about how health issues impacted her work on The Boys. “This final season coincided with the scariest moments of my life,” she wrote on Instagram, “I confronted health challenges that affected everyone around me.” She thanked the crew members “that did the heavy lifting to navigate said challenges”.

She added: “I remember thinking, more than once: ‘If these are my last days, how lucky am I to spend them with these people I love so much, in our special world we’ve created.'”

For more like this, like The Tab on Facebook.

Featured image via Prime Video.