“I’m entering into this new year, the Year of the Horse, with some bad news about my concussion,” the Marvel actor said in an Instagram video. “A lot of you asked how I’m doing. A lot of you have inquired about the brain scans that you heard I got. And the results came back from the scans [and] showed that almost every area in my brain is functioning at a decreased capacity.”

Lilly wrote in the caption to her post: “Verdict’s in… I do have brain damage from my [traumatic brain injury]. Comforting to know my cognitive decline isn’t just peri-menopause, discomforting to know what an uphill battle it will be to try to reverse the deficiencies. Thank you all for always asking, for always caring, and for your continued prayers.”

Lilly starred as Kate Bishop on all six seasons of “Lost,” which ran from 2004 to 2010. Her performance earned her a nomination for the Golden Globe Award for best actress in a drama series. She’s also well known for playing Hope van Dyne/Wasp in the Marvel Cinematic Universe, debuting as the character in 2015’s “Ant-Man” and reprising her in 2018’s “Ant-Man and the Wasp,” 2019’s “Avengers: Endgame,” and 2023’s “Ant-Man and the Wasp: Quantumania.” Lilly also played Tauriel in Peter Jackson’s “The Hobbit” trilogy, appearing in the latter two films “The Desolation of Smaug” and “The Battle of the Five Armies.”

Lilly added in a statement: “I have actually been on a hiatus from acting for the past three years already (since finishing ‘Quantumania’). This time outside of the business has brought me a grounding sense of fulfillment and joy. I could return tomorrow, two years from now or never, but at the moment I am not actively pursuing any work in the industry and am not under any contractual obligations to anybody. I am devoting my time to my humanitarian work and my writing.”