Multiple Sclerosis and Tinnitus: What the Reviews of Early Symptoms Actually Found

This page exists because "can tinnitus be a sign of MS" is a question people ask at three in the morning, and because the honest answer requires reading two reviews carefully rather than reading a symptom list.

The short version: hearing and balance symptoms can be early manifestations of multiple sclerosis, both reviews below establish that, and tinnitus is not the manifestation either of them is about.

What the scoping review set out to find

A 2022 scoping review in the Irish Journal of Medical Science searched five databases for studies of patients with hearing or balance symptoms at the early or presenting stage of MS. Eighteen papers met its criteria.

Its central finding, stated plainly:

The most common audiovestibular manifestation as a presenting symptom of MS was unilateral, moderate-profound, fluctuating, and sudden sensorineural hearing loss across all frequencies.

Every word there is doing work. Unilateral — one ear. Moderate to profound — a substantial loss, not a subtle one. Fluctuating. Sudden. Across all frequencies, 250 Hz to 8000 Hz, rather than the high-frequency slope of noise damage or age.

The review then lists what else can appear: tinnitus, balance abnormalities, aural pain and aural fullness, which may accompany the hearing loss or occur independently.

So tinnitus is on the list. It is on the list as an accompanying symptom in a review whose subject is sudden hearing loss, which is a different thing from being a presenting sign in its own right.

The base-rate problem, which is the whole issue

Here is the reasoning error the internet makes with this topic, and it is worth naming because it applies far beyond MS.

Both reviews study people who have MS and ask what symptoms they had. Neither studies people with a symptom and asks how many turn out to have MS. Those are different questions with wildly different answers, and only the second one is the question you are asking about yourself.

Multiple sclerosis is uncommon. Tinnitus is not — the global prevalence work puts it at around 14% of adults, more than 740 million people. Knowing that some proportion of MS patients experience tinnitus tells you close to nothing about the odds facing someone whose only symptom is a ringing in both ears.

What does carry information is the specific presentation these papers describe, and it is not a subtle one to notice.

The 2018 systematic review, and how to read its 25%

A 2018 systematic review in the European Review for Medical and Pharmacological Sciences asked whether sudden hearing loss can be an early detector of MS. It reviewed 47 articles, including only studies with at least one auditory test plus MRI.

Its findings:

• 25% of patients across the reviewed literature had sensorineural hearing loss.
• Sudden sensorineural hearing loss occurred in the early stage of disease in 92% of patients, and was the only presenting symptom in 43% of female subjects.
• Progressive hearing loss ran the opposite way, occurring in the late stage in 88%.
• When sudden loss appeared early, MS lesions were found in the brain in 60% of patients and in the internal auditory canal in 40%.

That last point matters mechanistically: MS is a disease of the central nervous system, but lesions in the internal auditory canal put it at the interface with the peripheral hearing apparatus. The scoping review takes this further, arguing its findings indicate involvement of the immune-mediated mechanisms of MS in the peripheral structures of the inner ear.

Now the caveat that belongs beside the 25%. Of the 47 articles, 29 were case reports. Six were prospective studies, six cohort studies, four case-control and two retrospective. A literature dominated by case reports systematically overstates how often the unusual thing happens, because the unusual thing is the reason each report was written. The 25% describes the published literature; it is not a population rate, and the review itself is a review of case reports as much as of studies.

The finding about ABR, which is genuinely interesting

Set aside MS for a moment, because this is a fact about a hearing test that is worth knowing.

In the 2018 review, auditory brainstem responses were abnormal in every MS patient with sudden hearing loss — and they remained abnormal after the hearing recovered.

An audiogram measures the quietest sound you can detect. An ABR measures how the signal travels up the auditory nerve and brainstem, by recording the electrical response at each relay. Those are different questions, and this is a case where one comes back to normal and the other does not. The demyelination is still there; the thresholds have merely caught up.

That is why a neurologist may order an ABR when the audiogram looks fine, and it is the basis for the scoping review's recommendation that evoked potentials be used complementary to MRI in detecting and monitoring MS. How tinnitus is measured covers the broader point that different instruments answer different questions, and that a normal result on one is not a clean bill of health on another.

The symptom that actually warrants urgency

If there is one thing to take from this page, it is not about MS at all.

Sudden sensorineural hearing loss is a medical emergency in its own right, regardless of cause, and the window for the treatment that helps is measured in days. It is the presentation both of these reviews are built around, and it is also the presentation where delay costs hearing that does not come back. The article on sudden sensorineural hearing loss covers what to do and how fast.

So the practical rule is simpler than the literature: you do not need to work out whether your sudden one-sided hearing loss might be MS. You need to be seen urgently either way, and the evaluation is what sorts out which of the several possible causes it is.

Where this leaves ordinary tinnitus

If your tinnitus is steady, has been there a while, is in both ears, came with no sudden change in hearing, and comes with no other neurological symptoms — nothing in either of these reviews describes you. That is not reassurance offered to be kind; it is what the papers say when read for what they actually studied.

Symptoms that do warrant raising the neurological question with a doctor, and which are not tinnitus:

• Sudden hearing loss in one ear, especially moderate to profound, and especially fluctuating.
• Vertigo or balance disturbance that is new and not explained. Dizziness alongside tinnitus has many causes, most of them ear-related rather than neurological.
• Visual changes, particularly pain on moving one eye or loss of vision in one eye.
• Numbness, weakness or coordination problems anywhere.

Any of those belongs in front of a doctor described completely, rather than being separated into the ear part and the rest.

Health anxiety about tinnitus is common enough to be a subject in its own right, and searching one's way through medical literature at night reliably makes it worse rather than better. Tinnitus and anxiety covers that loop directly, including why the answer to it is rarely more information.

What to do with this

• If your only symptom is tinnitus, this literature does not describe your situation. Start with an audiology appointment rather than a neurological one.
• If you have sudden hearing loss in one ear, treat that as urgent today. The cause matters less than the timing.
• If you have tinnitus plus new visual, sensory or coordination symptoms, describe the whole picture to a doctor at once, and do not present it as an ear problem.
• If you already have an MS diagnosis and tinnitus, it is a recognised part of the picture, and the approaches with the best evidence apply to it as they do to any other tinnitus.
• If you are here because a search result frightened you, the specific thing these reviews describe is sudden, substantial, one-sided hearing loss. That is a noticeable event, not something you would need to investigate to find out whether you had.