Multiple Sclerosis: The Everyday Complaints That May Show Up 15 Years Before The First Classic Symptom

A doctor’s visit for fatigue. Another for back pain, or trouble sleeping, or anxiety. Each is ordinary, and on its own says little about multiple sclerosis. But in the health records of people later diagnosed with MS, complaints like these turned up more often than in their peers’ records, sometimes years before the first classic symptom.

Researchers call this run-up the MS “prodrome,” a stretch when vague signs may surface before anyone recognizes the disease. A 2025 University of British Columbia study, which UBC said looked further back than any earlier study of health care use before MS, found that people who developed MS were seeing doctors more often 14 to 15 years before symptom onset. The same body of research also shows why that signal is not a warning sign anyone can use yet. The complaints are common, the studies describe patterns across groups rather than risk for any one person, and a recent review concluded the evidence does not yet justify changing how MS is managed or shifting public health policy.

How Early Do The Traces Appear?

Possibly 15 years, judging by doctor visits.

The study, published in JAMA Network Open, drew on British Columbia health records from 1991 to 2018. It compared 2,038 people with MS against 10,182 people without it, matched by sex, birth year and postal code. For most patients, a neurologist recorded the symptom onset date after taking a medical history. All-cause physician visits were 19 percent higher 14 years before onset. Visits for ill-defined symptoms and signs, meaning complaints without a clear diagnosis, ran at least 15 percent higher across all 15 years, and general practice visits were elevated in every one of those years. Mental-health visits were higher in most years starting 14 years out, as were psychiatrist visits starting 12 years out.

More specific care came later. Ophthalmology visits were elevated as early as nine years before onset, and neurology visits as early as eight. Visits for sensory-organ problems rose as early as eight years out, musculoskeletal problems five and nervous-system problems four. Because the records show associations in health care use, the design cannot show that MS caused these early complaints.

Which Everyday Complaints Stand Out?

Mostly those recorded in the final five years.

An earlier British Columbia study in Multiple Sclerosis Journal examined fatigue, sleep disorders, anemia and pain in the five years before MS was recognized, measured two ways. Among 966 patients with a neurologist-dated onset and 4,534 controls, the odds of a recorded sleep disorder were 72 percent higher and the odds of pain 53 percent higher. Recorded fatigue was not significantly different.

In a second, larger and older group, the researchers counted back from each person’s first health-care claim for a demyelinating condition, a disorder that damages the protective coating on nerves. Among 6,863 cases and 31,865 controls, the associations were larger: the odds of fatigue were more than three times higher, and the odds of sleep disorders and pain more than twice as high.

A 2020 systematic review pooled 29 studies comparing people with and without MS. Anxiety, depression, migraine and weaker scores on thinking tests turned up more often in future patients in most of the studies that measured them, though only eight of the 29 studies earned a high-quality rating. In Sweden, a nationwide matched-cohort study found that people later diagnosed with MS used more outpatient care, hospital care and prescription drugs for a range of health problems, with some differences visible six to nine years before symptom onset.

Does A Blood Marker Change The Picture?

Possibly, though the evidence is small.

A JAMA Neurology study tested stored blood from US military personnel, comparing 60 people who later developed MS with 60 matched controls. It measured serum neurofilament light chain (NfL), a protein released when nerve fibers are damaged. In samples taken a median of six years before onset, median levels were 16.7 picograms per milliliter in future patients and 15.2 in controls, and the gap widened as onset approached. Of the 120 participants, 76.7 percent were men, while 74 percent of the British Columbia MS patients were women, which limits how well the results apply to the broader MS population.

NfL signals nerve damage in general, not MS specifically. The British Columbia researchers suggested that some early symptoms might stem from immune activity outside the brain and spinal cord that NfL may not fully capture. If so, the blood marker and the 15-year visit pattern may not track each other.

What Does The Evidence Actually Support?

No reliable symptom checklist.

Many of these complaints are common. In the Multiple Sclerosis Journal study, about 43 percent of controls in the clinical comparison had recorded pain. The National Multiple Sclerosis Society explains that diagnosis starts with a medical history and neurologic exam, which in many cases is enough. Tests such as MRI and spinal fluid analysis can confirm the diagnosis, and blood tests help rule out look-alike conditions such as lupus, vitamin deficiencies and some infections.

The British Columbia authors note that their records captured only problems that led people to seek care, that codes may be misclassified, and that onset dates may be affected by imperfect recall. The study also took place in a universal, publicly funded health system, so visit patterns could differ elsewhere.

A 2024 review in the Journal of Neurology called prodrome research a young field. The authors said three questions remain open: how long the prodrome lasts, whether its symptoms are specific to MS, and whether intervening early would help. They judged that the current evidence does not yet support changing how MS is managed or shifting public health policy.

That makes the signal worth studying, not self-diagnosing. The British Columbia team suggests future work may combine clinical, biological and lifestyle data to spot MS earlier. For now, an everyday complaint on its own is far too common to point to MS.

Disclaimer: This article summarizes observational research, including health-record cohort studies from Canada and Sweden, a small blood-sample study of US military personnel, a systematic review and a clinical review. None of these studies tested whether any symptom can predict MS in an individual, and none show that the early complaints were caused by MS. Health-record studies capture only problems that led someone to seek care and can be affected by coding errors and imperfect recall of when symptoms began. This article is for general information and is not medical advice. Anyone with new or persistent symptoms should talk with a healthcare provider.