Christina Applegate Misdiagnosed with MS, Continues to Seek Answers for Debilitating Symptoms
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Christina Applegate Misdiagnosed with MS, Continues to Seek Answers for Debilitating Symptoms

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Image: Variety

Actress Christina Applegate revealed she was incorrectly diagnosed with multiple sclerosis (MS) five years after initially receiving the diagnosis. Applegate shared the news on her podcast, “MeSsy,” explaining that a recent change in her treatment led doctors to re-evaluate her condition and ultimately determine she does not have MS. Despite the revised diagnosis, Applegate continues to experience debilitating symptoms, including numbness, loss of balance, and tingling, and is now undergoing further investigation to determine the cause.

Applegate initially announced her MS diagnosis in 2021, undergoing tests such as spinal taps and MRIs that revealed lesions on her brain. She began infusion treatments, but her doctor eventually sought to assess her response by discontinuing the infusions. When her B-cell count remained unchanged, a more thorough investigation began, ultimately leading to the misdiagnosis. Dr. Marwa Kaisey, an associate professor at Cedars-Sinai Medical Center, noted on the podcast that nearly one in five MS diagnoses are incorrect, due to the lack of a single definitive test.

Applegate expressed frustration with the situation, stating, “You don’t get misdiagnosed and then all of a sudden I’m better.” She described feeling “lost” and “hollow” after learning she didn’t have MS, as she had embraced the MS community and found a reason for her daily struggles. Applegate previously shared that she used a cane and wheelchair during filming of “Dead to Me” and considered giving up acting due to her symptoms. She continues to receive physical therapy three times a week and will begin a new round of testing next week to identify the source of her ongoing health issues.

What is not yet known

  • The specific underlying cause of Applegate’s debilitating symptoms remains unknown.
  • The timeline and details of the “online investigation” her doctors will undertake are not yet specified.

Background

  • Christina Applegate initially announced a diagnosis of multiple sclerosis in 2021, undergoing tests including spinal taps and MRIs [Fact Refinery, 2026-09-02].
  • Doctors assessed Applegate’s response to MS infusion treatments by discontinuing them, noting that a lack of change in her B-cell count prompted further investigation [Fact Refinery, 2026-09-02].
  • Approximately one in five multiple sclerosis diagnoses are ultimately incorrect, due to the absence of a single definitive diagnostic test [Fact Refinery, 2026-09-02].
  • Multiple sclerosis is a condition affecting the central nervous system [background knowledge].

Our reading

Our reading is that Applegate’s experience highlights the challenges of diagnosing complex conditions, even with advanced medical testing. The initial diagnosis provided a framework for understanding her symptoms, and its revision has left her feeling adrift despite the relief of not having MS. The situation underscores the importance of continued investigation when initial treatments prove ineffective and the emotional toll of navigating uncertain health issues.

What to watch

  • Results of the “online investigation” doctors will undertake to determine the cause of Applegate’s symptoms [podcast, ongoing].
  • Any publicly released details regarding the timeline for Applegate’s new round of testing [podcast, ongoing].
  • Whether Applegate’s symptoms change following the new testing and any subsequent treatment [podcast, ongoing].
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