Full Breakdown
Study Suggests Mysterious Global “Hum” May Be a Form of Low-Frequency Tinnitus
6/3/2026, 11:35:20 AM
Background
The Hum first entered public awareness in Bristol, England, when residents reported a low-frequency droning. Since then, indoor reports have appeared across the United Kingdom, United States, Canada, Australia, New Zealand, South Africa and several European cities. The sound is heard by some but not by others sharing the same space, and it has been linked to irritation and nausea. Explanations have ranged from fans to natural infrasound and speculative theories.
Study Tests Internal Origin of the Hum
Professor Markus Drexl of the Norwegian University of Science and Technology led a *PLOS One* study testing whether hum originates inside the ear. Twenty-eight German participants who reported hearing the hum underwent audiometric testing, otoacoustic emission measurements and low-frequency detection tasks to separate external hearing from internal auditory phenomena.
Data & Statistics
Among the 28 participants, two showed better-than-average low-frequency sensitivity; the remaining 26 had normal hearing thresholds. No measurable low-frequency emissions from the cochlea were detected in any subject.
Official Statements & Responses
Professor Drexl said the findings support a low-frequency form of tinnitus and noted that the cochlea can emit faint sounds, usually unnoticed. He highlighted a knowledge gap: most auditory research focuses on higher frequencies, leaving low-frequency and infrasound processing poorly understood, and stressed that external sources have not been definitively ruled out.
Criticism, Limitations & Gaps
The study’s small sample limits statistical power, and the inability to record objective low-frequency ear emissions leaves the internal-origin hypothesis indirect. Without comprehensive environmental sound monitoring, external contributors cannot be fully excluded.
On-the-Ground Reports
Glen MacPherson, a former resident of Canada’s west coast, described a persistent indoor drone that stopped after he moved. His experience prompted a 2012 database to collect similar reports, illustrating the hum’s selective perception.
Why It Matters
Confirming the hum as a genuine auditory phenomenon challenges the view that it is imagined, suggests low-frequency tinnitus, and may prompt new clinical assessments and research into ear processing of infrasound.
Verbatim Quotes
- “We believe people in this category have a form of low-frequency tinnitus,” — Markus Drexl, Professor, Norwegian University of Science and Technology
- “Most of us don’t hear these sounds. However, a few people can actually hear the sounds that the ear itself produces. And these sounds can be measured objectively,” — Markus Drexl
- “Even though the group we tested was small, it still means that the hypothesis of having especially good hearing for low-frequency sounds does not hold for most people,” — Markus Drexl
- “What we know about the hearing system is mainly based on how we capture and process sound with higher frequencies. We know less about how the auditory system handles and processes low-frequency sound, or infrasound,” — Markus Drexl
What’s Next
The authors call for larger, multidisciplinary studies combining audiology with environmental sound mapping and investigating cochlear low-frequency emissions and potential treatments for low-frequency tinnitus.
