Characteristics of The Hum — What Sufferers Describe

Those who perceive the Hum describe a remarkably consistent set of characteristics across geographic locations and cultural backgrounds. The sound is typically in the 30-80 Hz frequency range — well below normal conversation but above the threshold of human hearing. It is described as a continuous, low-pitched drone or rumble, sometimes pulsating or throbbing. The Hum is almost always more noticeable indoors than outdoors, more prominent at night than during the day, and often perceived more strongly in rural areas than in noisy urban environments. Many sufferers report that the sound seems to emanate from inside their own heads rather than from an external source. Masking the Hum with white noise or background sounds provides temporary relief for some, but others find it penetrates through all other sounds. The psychological impact can be severe: chronic sleep disruption, anxiety, irritability, and cognitive difficulty are commonly reported. Some sufferers have reported relief when traveling to different locations, only to find the Hum waiting for them at their new destination. First reported systematically in the early 1970s, the Hum appears to be a genuinely modern phenomenon — there are no comparable reports from before the industrial era.