Tinnitus is common in visual snow syndrome, reported in about half to four in five people with it, and ranks with migraine among its most frequently reported companion conditions, but the reason for the overlap is unproven.
The link is not only a clinic impression. In a representative sample of UK adults, tinnitus was the one condition, of those the study asked about, that stayed associated with visual snow syndrome once age and gender were accounted for. What the association means is much less settled than how often it appears.
What visual snow syndrome is
The International Headache Society lists visual snow in the appendix of its classification, ICHD-3, and says the criteria are there partly so that researchers study a consistently defined group. They are:
- Dynamic, continuous, tiny dots across the entire visual field, lasting more than 3 months. People compare it to television static.
- At least two of four further visual symptoms: palinopsia (afterimages, or trails behind moving objects), enhanced entoptic phenomena (such as excessive floaters, or dots and flashes arising from the visual system itself), photophobia (light sensitivity) and nyctalopia (poor night vision).
- Symptoms that do not fit typical migraine aura, and that are not better explained by another disorder. That last clause assumes normal eye tests, including acuity, a dilated eye examination, visual fields and electroretinography, and no use of psychotropic drugs.
Tinnitus is not among the criteria; every item is visual.
How common the syndrome is depends on how people are asked. A crowdsourced survey of 1,015 UK adults, who were not told the survey was about visual snow, found 22 who met the criteria (2.2%). A survey of 750 Italian university students, with diagnoses confirmed in person, found 5 (0.7%), and none of the 7 who reported visual snow had been diagnosed before.
In a 2020 web survey of 1,104 people with visual snow, the average age was 29, men and women were affected equally, and about 40% had had symptoms for as long as they could remember. Its authors note that internet-only recruitment may have skewed young, and the UK sample fits that: there, people with the syndrome averaged about 51, with 1.6 women for every man.
How often tinnitus comes with it
The figure varies with who is counted:
- Web surveys of self-identified patients. Among the 1,104 respondents, three-quarters of those with the full syndrome had tinnitus. In a 2022 survey of 400 people with the syndrome, 316 did (79%).
- Clinic and research cohorts. At a Dutch outpatient clinic, daily tinnitus was recorded in 26 of the 50 patients whose charts noted it either way (52.0%). Among 66 people pooled from research studies at a Munich headache centre, 32 reported tinnitus (48%). In a research imaging study that recruited through social media with a visual snow self-help group, 10 of 20 had it (50%).
- The general population. In the UK sample, 13 of the 22 people with visual snow syndrome had tinnitus (59.1%). Among the Italian students, all 7 who reported visual snow also reported tinnitus, a count too small to put much weight on.
The web surveys give the highest figures. Their authors note that recruiting this way probably favoured people at the more severe end of the condition, and in the 1,104-person survey that is where tinnitus was most likely to appear. That makes the figures of around half from other settings the more cautious range, though the pattern is not tidy: the imaging study also recruited through a patient network and found half.
The strongest evidence that the link is real comes from the UK study. It also asked about mood symptoms (16 of the 22) and headache (12 of the 22), but after adjusting for age and gender only tinnitus remained significantly associated with visual snow syndrome, with an odds ratio of 3.93 (95% CI 1.63 to 9.9). The interval is wide because the result rests on 22 people. A Portuguese general-population survey pointed the same way without using diagnostic criteria at all: the more often people saw visual snow, the more often they reported tinnitus. And a 2022 systematic review, which included 30 of 855 articles screened, found migraine with aura and tinnitus to be the comorbidities reported most often.
More tinnitus, more visual symptoms
Among the 1,104 respondents, people with tinnitus were about twice as likely to report a higher number of additional visual symptoms, and people with migraine more than 2.5 times as likely. A test for an interaction between the two was not significant, which the authors read as migraine and tinnitus adding to severity independently. Their conclusion is that visual snow is a spectrum, and that the severe end is where migraine and tinnitus are most likely to appear.
Migraine and tinnitus are linked within the syndrome as well. In a 2014 telephone-interview study of 120 people with visual snow, those who also had migraine were more likely to have tinnitus (odds ratio 2.9), and the ICHD-3 commentary repeats the point. The wider link between migraine and tinnitus has its own evidence and its own caveats.
These are associations measured at one point in time. They show tinnitus, migraine and more severe visual snow clustering in the same people, not that one makes another worse.
Why the two might be connected
The main proposal is that visual snow and tinnitus are two versions of one problem: the brain perceiving a signal that is not there, or one it would normally ignore. The authors of the 1,100-case study describe the two as possibly different manifestations of a similar disorder, and suggest mechanisms including thalamocortical dysrhythmia, an abnormal rhythm between the thalamus and the cortex. The same idea has been proposed for tinnitus alone, as tinnitus and hearing loss explains.
Some imaging supports the idea that visual snow reaches beyond vision. A 2020 study in Brain compared the brain metabolism of 20 patients and 20 matched controls using PET scans. Patients had lower metabolism in the right superior temporal gyrus and the left inferior parietal lobule, among other changes. The authors suggest these might be a correlate of tinnitus, which half their patients had, calling tinnitus potentially "the acoustic equivalent of visual snow". They also say the study was too small to test which brain areas go with which symptom.
A 2021 narrative review in Headache goes further, proposing that visual snow syndrome, chronic tinnitus, fibromyalgia and persistent postural-perceptual dizziness (PPPD) may lie on one spectrum of perceptual disorders, with migraine as a common risk factor. It is a hypothesis assembled from overlapping clinical, imaging and electrophysiological findings, not a tested model.
One test of the "noisy senses" idea came back negative. A 2025 study compared 36 people with visual snow syndrome and 39 controls matched for age, sex and migraine on a standard battery of touch, temperature and pain tests, and found no evidence of altered thresholds. The authors took this as pointing to a higher-level problem of sensory integration rather than an amplification of every sense.
One gap matters for anyone with tinnitus. The tinnitus figures above come from questionnaires, interviews and medical records rather than hearing tests, so they cannot say whether hearing loss contributes to tinnitus in people with visual snow.
Is visual snow syndrome a settled diagnosis?
Not entirely. The 2022 systematic review found a single epidemiology study, treatment data made up only of single case reports and a mechanism approached only with hypotheses, and concluded that the data were not yet strong enough to support visual snow syndrome as a medical identity.
On the other side, the ICHD-3 commentary says the listing exists partly so that clinicians stop mistaking the symptoms for persistent migraine aura, and a 2024 clinical review in Eye notes that doctors often used to dismiss the condition as psychological. A 2016 case series of 32 patients described frequent misdiagnosis as psychiatric illness or malingering.
Anxiety and low mood are common alongside it. At the Dutch clinic, 44.8% had lifetime anxiety and 41.4% lifetime depression; in the German cohort, 48% reported anxiety symptoms and 39% depressive symptoms, and its authors warn of the risk of the condition being written off as psychosomatic. The Dutch authors cannot say whether mood problems are cause, consequence or shared risk, but recommend treating them, noting that in tinnitus, too, depression is associated with a higher burden. Tinnitus and anxiety and tinnitus and depression cover that side.
What helps
Nothing has been tested for tinnitus in visual snow syndrome specifically. The treatment research is about the visual symptoms, and it is thin.
- Medicines rarely help the static. A 2020 systematic review found 44 medicines tried across published cases, only 8 of which helped anyone even once. The best data were for lamotrigine, effective in 8 of 36 people (22.2%). At the Dutch clinic, lamotrigine brought partial improvement in 5 of 26 patients and complete remission in none, while 13 of the 26 had side effects. In the 400-person survey, 158 of the 326 people who had taken any medicine reported no effect on their visual snow from any of them. The author of the Eye review reports not having found these drugs helpful in clinic, with side effects often worse than the condition.
- Tinted lenses. In the 2016 case series, filters in the yellow-blue range subjectively reduced symptoms, and the 2020 review lists coloured filters as a non-drug option that may help some patients. The evidence is self-report without controls.
- Mindfulness. An open-label study of an 8-week mindfulness-based cognitive therapy course adapted for visual symptoms, in 21 participants, found median symptom severity fell from 7 to 4 out of 10 by week 20. With no control group, part of that could be expectation or natural fluctuation. The authors cite evidence that mindfulness reduces tinnitus distress, which mindfulness and ACT for tinnitus examines.
For the tinnitus itself, the Dutch authors note that cognitive therapy reduces tinnitus severity and impairment, and suggest it might help visual snow as well. That second idea has not been tested in a controlled trial; the only study is the uncontrolled mindfulness course above. CBT for tinnitus and the treatment comparison set out the tinnitus options and the strength of evidence behind each.
On outlook, the Eye review describes visual snow syndrome as generally non-progressive though fluctuating, and says it does not cause blindness and is not associated with dementia. A 2023 study of 100 people with the syndrome found that longer duration went with lower perceived severity, which fits adjustment over time without proving it. How long it takes to get used to tinnitus covers the equivalent process for sound.
When to get it checked
Visual snow syndrome is diagnosed partly by ruling out other causes. The Eye review, which sets out one specialist's clinic practice, lists features that do not fit it and suggest something else:
- sudden onset, or onset at an older age
- static confined to a small area of vision, or to one eye
- symptoms linked to drug use, which raises hallucinogen persisting perception disorder instead
- bright shimmering that persists with the eyes closed, or extreme night blindness or light sensitivity
- reduced vision or gaps in the visual field on examination
For very new symptoms or changes in the visual field, the review's author requests an MRI of the brain. Any of these calls for an eye examination and a clinician's assessment, not self-diagnosis.
The ear side has its own warning signs, set out in the when-to-seek-care tool and whether tinnitus can be a sign of something serious. The most urgent is a sudden drop in hearing, which the US National Institute on Deafness and Other Communication Disorders says to treat as a medical emergency, because delay can make treatment less effective; sudden hearing loss explains why. For a slower change in hearing, a first audiology appointment describes what a check involves. Tell whoever assesses your tinnitus about the visual symptoms, and whoever assesses your vision about the tinnitus.