The Mystery of the "Global Hum," the Droning Sound Reported By Thousands

Key Points:

• The "global hum" is a persistent low-frequency humming sound reported by thousands worldwide since the 1970s, with early cases documented in Bristol, England, and later in various countries including the UK, Europe, North America, Australia, and New Zealand.
• Scientific investigations, such as those led by Norwegian researchers and US laboratories, have found no definitive external source, suggesting the hum may often be a form of low-frequency subjective tinnitus experienced by certain individuals.
• Various theories exist regarding the hum’s origin, including natural phenomena like microseismic waves, human-made sources such as pipelines or electromagnetic frequencies, and even paranormal explanations, but none have conclusively explained the phenomenon.
• The Worldwide Hum Project, launched in 2012, collects global reports to help distinguish between actual external sounds and internal auditory perceptions, noting the hum is often louder at night and indoors.
• Experts advise those affected to manage the hum by reducing anxiety and focusing less on the sound, as no clear scientific explanation or cure is currently available, and the phenomenon remains a mystery after decades of study.