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Your doctor's visit history might reveal a rare disease before you even know you have it. A new study found that people who later developed neuromyelitis optica spectrum disorder (NMOSD) began visiting healthcare providers more frequently 5–6 years before their first clinical attack. Researchers say these early patterns could be a window for preventive intervention — potentially stopping disability before it starts.
A large new study suggests that the seeds of neuromyelitis optica spectrum disorder (NMOSD) — a rare, antibody-driven inflammatory disease of the central nervous system — may be detectable long before a patient ever gets a formal diagnosis. Researchers analyzed 7 million longitudinal electronic health records and found that people who later developed NMOSD were visiting healthcare providers more frequently starting 5 to 6 years before their first clinical episode.
The findings, presented at the 10th Joint ACTRIMS-ECTRIMS Meeting (MSToronto 2026), echo what's already known about multiple sclerosis (MS), where a similar prodromal healthcare utilization pattern has been documented. To dig deeper, the team mapped their data onto a biomedical knowledge graph, uncovering biological signals like complement activation, B-cell activation, and myelin damage — all consistent with early autoimmune activity and possible infectious triggers.
Key Takeaways
Why it matters: Recognizing a prodromal phase in NMOSD could give clinicians a critical early window to identify at-risk patients and intervene before irreversible tissue damage and disability accumulate — a key goal of the emerging field of preventive neurology.
