Christina Applegate MS Misdiagnosis Highlights Urgent Need for Better 2026

Christina Applegate's recent revelation that her neurologist now believes she does not have multiple sclerosis (MS) after all has sent shockwaves through the MS community. For the millions of people living with this chronic neurological disease, Applegate's story is a stark reminder that misdiagnosis is not just a rare fluke—it's a systemic issue that affects many.

Applegate, who has been a prominent spokesperson for MS since her diagnosis five years ago, shared that her doctor now thinks she may have been misdiagnosed. While she is still experiencing symptoms, the undiagnosis leaves her without a clear explanation for her suffering. This is not good news for her, and it's a scenario that resonates deeply with others who have faced similar uncertainty.

The Prevalence of MS Misdiagnosis

A 2024 systematic review found that approximately 15% of MS cases studied were misdiagnosed. This means that roughly one in seven people diagnosed with MS may not actually have the disease. The implications are profound: patients may undergo unnecessary treatments, experience side effects, and face emotional turmoil from an incorrect diagnosis.

What's more, the review revealed a significant gender disparity: women are twice as likely as men to be diagnosed with MS when they do not have it. This raises questions about potential biases in diagnostic criteria and the need for more precise testing methods.

Underdiagnosis is also a concern, with many patients waiting months or even years for a correct diagnosis. The lack of a definitive test for MS means that diagnosis relies on a combination of clinical symptoms, MRI findings, and ruling out other conditions—a process that is inherently challenging.

Why MS Is So Hard to Diagnose

Multiple sclerosis is a complex disease with a wide range of symptoms that can mimic other conditions. There is no single test for MS; instead, doctors use a combination of methods:

• MRI scans to detect lesions in the brain and spinal cord
• Lumbar punctures to check for abnormal antibodies in the cerebrospinal fluid
• Evoked potentials to measure nerve conduction
• Clinical history and neurological exams to assess symptoms over time

These tools are not foolproof. Some conditions, such as neuromyelitis optica spectrum disorder (NMOSD) and MOG antibody disease (MOGAD), can present similarly to MS but require different treatments. Additionally, factors like age, gender, and ethnicity can influence the accuracy of diagnosis.

The Human Cost of Misdiagnosis

For patients, a misdiagnosis can mean years of unnecessary treatments, including immunosuppressive drugs that carry significant risks. It can also lead to psychological distress, as patients grapple with the uncertainty of their health status.

Applegate's case highlights the emotional toll: even after years of advocacy and acceptance, she now faces the challenge of re-evaluating her identity and health. As she put it, she is "back to square one" in terms of understanding her condition.

Dr. Lilyana Amezcua, a neurologist at the University of Southern California, told NBC News that Applegate's case is unusual but not unheard of. "Misdiagnosis can happen, and it's important for patients to feel empowered to seek second opinions," she said. "We need to improve diagnostic accuracy through better biomarkers and more standardized criteria."

What This Means for Patients

If you have been diagnosed with MS, experts advise that most diagnoses are correct. However, if you have concerns, it's reasonable to seek a second opinion. Here are some steps you can take:

• Ask for a referral to an MS specialist or a center of excellence.
• Review your diagnostic criteria with your doctor and ensure all tests were performed correctly.
• Consider a second opinion if your symptoms don't fit the typical MS pattern or if you're not responding to treatment.
• Stay informed about new research and diagnostic tools.

Dr. Bruce Bebo, executive vice president of research at the National Multiple Sclerosis Society, emphasized that while misdiagnosis occurs, the majority of MS diagnoses are accurate. "We encourage anyone with questions to talk to their neurologist," he said. "The field is advancing, and we're committed to improving diagnostic precision."

The Road Ahead: Improving Diagnosis

The medical community is actively working to reduce misdiagnosis rates. Researchers are identifying new biomarkers, such as neurofilament light chain, which may help distinguish MS from other conditions. Additionally, the 2017 McDonald criteria, which guide MS diagnosis, are periodically updated to incorporate the latest evidence.

For now, Applegate's story serves as a cautionary tale and a call to action. It underscores the need for greater awareness, better diagnostic tools, and more support for patients navigating the uncertainty of a complex disease.

As Applegate continues to share her journey, she remains a powerful advocate for the MS community. Her willingness to speak openly about her experience—even when the answers aren't clear—helps reduce stigma and fosters a sense of solidarity among those affected. The background to this story is set out in Celebrity: latest articles.