Christina Applegate, the 54-year-old actor best known for Married with Children and the Netflix drama Dead to Me, has revealed she was misdiagnosed with multiple sclerosis, leaving her without any explanation for the debilitating symptoms that have reshaped her life and forced her retirement from acting. Speaking on her own podcast on Monday, Applegate said a doctor delivered the unexpected news with the word "congratulations", a word she could not share in the spirit it was intended.
The diagnosis that was not a diagnosis
Applegate was told she had multiple sclerosis in 2021, while she was still filming the third and final season of Dead to Me. The condition had by then already produced a full range of severe symptoms, and for years she underwent infusion treatments that, in her own words, "play havoc on your body."
The turning point came when her doctor stopped the infusions to observe how her immune system would respond. In a genuine MS patient, removing those treatments causes levels of B cells to fluctuate markedly. For Applegate, they did not move. Her levels remained stable, raising serious doubts about the original diagnosis.
"You're not going to freaking believe this," Applegate told her co-host Jamie-Lynn Sigler on their podcast MeSsy, recounting the moment her doctor entered the room. "She said: 'Congratulations, you don't have MS'."
Applegate said her reaction was not one of relief. While those around her were emotional with happiness, she felt the opposite. "I was not happy at all," she said, pointing out that the announcement changed nothing about how she feels physically. "Nothing magical happened when she said, 'You don't have MS'. Nothing magical happened."
Still ill, still searching for answers
The misdiagnosis does not mean Applegate is well. She still relies on a wheelchair and a cane for public appearances, as seen at her Hollywood Walk of Fame induction in 2022 and again at the Primetime Emmys in 2024, where she presented an award. Her condition has, in some respects, worsened.
"I can't walk from the car to the room," she said. "I still have to use wheelchairs when I go to the doctor's office. I'm still in this."
Without a diagnosis, she is now undergoing further tests to identify what is actually causing her symptoms. She described the psychological toll of the revelation as profound, saying she had built a sense of identity around understanding what was wrong with her. "I had a reason as to why my day sucked every day and now I don't have a reason," she said. "It's very unnerving and it's really confusing for me."
She also expressed a deep sense of guilt about having become a public advocate for people living with MS. "I feel like I let everybody down," she said. "I had every symptom of someone with MS. Every single one."
Why MS misdiagnosis is more common than many realise
Applegate's experience, while striking, is not isolated. MS is notoriously difficult to diagnose correctly because there is no single definitive test for the condition. Neurologists instead draw on a patient's history, physical examination, MRI findings, and in some cases cerebrospinal fluid analysis to form a picture.
Professor Todd Hardy, a neurologist at the University of Sydney, has noted that MS symptoms can be highly variable and frequently overlap with other conditions. MRI scans can show abnormalities that look like MS but are in fact the result of migraine, ageing, or small-vessel disease, he has said.
A study conducted in 2019 found that 18 per cent of new MS patients admitted to two clinics in the United States had in fact been misdiagnosed. The condition affects more than 37,000 Australians and around 3 million people worldwide, with women diagnosed at roughly three times the rate of men. It is the most common acquired chronic neurological disease among young adults, with the average age of diagnosis falling between 20 and 40 years old.
One Australian woman, who asked to be identified only as Nicole, spent nine years believing she had MS after brain scans revealed demyelination and multiple neurologists confirmed the diagnosis. It was not until she underwent surgery for hearing loss that an ear, nose and throat specialist suggested her primary symptom of extreme dizziness was caused by untreated crystals in her ear. A new neurologist eventually cleared her of MS entirely, and she has been well since. Unlike Applegate, Nicole's response to the news was largely one of relief, though she acknowledged the lost years.
What comes next for Applegate
With no confirmed diagnosis and no improvement in her condition, Applegate is now at the beginning of a new and uncertain phase of her health journey. She described herself plainly as being "back at square one," with no clarity yet on what underlying illness is responsible for the symptoms that have defined her life for the past five years.
Her openness about the experience, including the emotional complexity of receiving news that others celebrated while she grieved, has drawn a significant response from those who follow her public battle with chronic illness. For now, she is waiting on test results and searching, once again, for answers.
