AnomalyLike a diesel truck idling in the neighborhood or like when you put your head underwater in a hot tub with the jets running. I don't remember exactly when I started hearing it, however I would like to add that after my anxiety began (around 2014) the noise became more noticeable, which caused insomnia. I had trouble sleeping before this due to the noise, however it sounded like it was miles and miles away at that point. Where now it sounds like its a house or two down.
USA, Greenville/Greer · 2019-11-12 · from the WORLDHUMMAP archive
An account in USA, Greenville/Greer
What they reported
First noticed: 2011
Pitch: 47 Hertz
Loudest: During the night
Where: Indoors
Symptoms: Insomnia
Changes with weather: Not that I have noticed
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.