Tinnitus low hum, what is constant ringing in the ears called - .

The Hum is a phenomenon, or collection of phenomena, involving a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. Those who can detect the Hum have been referred to as "hearers", "sensors", "hummers", and "humlings".
Other elements seem to be significantly associated with the Hum, being reported by an important proportion of hearers, but not by all of them.
Some people perceive the Hum continuously, but others perceive it only during certain periods.
In the Unsolved Mysteries segment called 'Mystery Hum', a tape recreation of the Taos Hum was used for this segment.
On November 15, 2006 Dr Tom Moir, of the University of Massey in Auckland, New Zealand, made a recording of the Auckland Hum and has published it on the university's website.
It is during the 1990s that the Hum phenomenon began to be reported in North America and to be known to the American public, when a study by the University of New Mexico and the complaints from many citizens living near the town of Taos, New Mexico, caught the attention of the media.
It is difficult to tell if the Hum reported in those earlier cases and the Hum that began to be increasingly reported in North America in the 1990s should be considered identical or of different natures.
A suggested diagnosis of tinnitus, a disturbance of the auditory system, is used by some physicians in response to complaints about The Hum. While the Hum is hypothesized by some to be a form of low frequency tinnitus such as the venous hum, some sufferers claim it is not internal, being worse inside their homes than outside.

People who both suffer from tinnitus and hear the Hum describe them as qualitatively different, and many hum sufferers can find locations where they do not hear the hum at all. Human ears generate their own noises, called spontaneous otoacoustic emissions, which about 30% of people hear. Researchers from the USArray Earthscope have tracked down a series of infrasonic humming noises produced by waves crashing together and thence into the ocean floor, off the North-West coast of the USA.
In the case of Kokomo, Indiana, a city with heavy industries, the origin of the hum was thought to have been traced to two sources.
Tinnitus is generated internally by the auditory and nervous systems, with no external stimulus. An investigation by a team of scientists in Taos dismissed the possibility that the Hum was tinnitus as highly unlikely. A Hum on the Big Island of Hawaii, typically related to volcanic action, is heard in locations dozens of miles apart. Data from the Taos Hum study suggests that 2% to 5% of the general population can detect the Hum, with individuals 50 years of age or older being particularly prone to sensing it.
Common consequences include a lack of sleep, as the Hum can keep some people awake or wake them in the middle of the night. This was done since their audio equipment didn't pick up low-frequency sounds very well, and so that the show's viewers and other non-"Hum sufferers" would get an idea of what the actual auditory phenomenon sounded like.

However, the theory that the Hum is actually tinnitus fails to explain why the Hum can be heard only at certain geographical locations, to the degree those reports are accurate.
There may exist individual differences as to the threshold of perception of acoustic or non-acoustic stimuli, or other normal individual variations that could contribute to the perception of the Hum by some people in the population and not by others. However, in the late 1990s, seismologists discovered that the world also constantly vibrates at very low frequencies even when there are no quakes.
And the Earth itself is known to make a hum, generated by a number of events including the rumbling of storm-driven ocean waves. Researchers now believe the Earth's hum can help them analyze the composition of our planet's interior. Preliminary analyses have led investigators to believe the source of the hum is on or near Zug Island, an industrial area on the Michigan side of the international border, the Wall Street Journal reports.

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