The Hum is caused by gravity waves and at the present very little is known on how gravity affects the human body and almost all the information has been collected from the Hum sufferers themselves.
The attention of sufferers is often drawn to the variations in Hum level which occur on a regular basis and the cause of these variations can be ascribed to three main changes.

The first is the ionosphere, which is not static but in constant movement and as this is where the waves originate it should come as no surprise that the Hum level is constantly changing.
The second is the level of voltage on the power grid, which changes with the load and produces two noticeable high Hum levels, one at about 3am local time and a smaller variation at about local noon.
The third variation is due to the sensitivity of the Hum sufferer. I it still not known why some people are affected and others are not but a good clue may be gathered from the well known “holiday affect”
This comes about when Hum sufferers travel on holiday and are greatly relieved to find that upon their return the Hum has disappeared, however, this respite is short lived, for after 3 or 4 days the Hum returns to its former level. This is evidently due to changes taking place in the body and it has been suggested that the most likely cause is due to changes in the blood calcium level.
Many attempts have been made to control the Hum level by the use of diet and medication but the results so far have been inconsistent.
Another indication that changes are taking place in the body is the increase in body temperature which occurs at times of high Hum level. This is most noticeable in the early hours, around 3-4am. Normally at this time the body should be at the lowest reading of its daily cycle but at times of high Hum level the body temperature can be as high as 4 degrees centigrade above the norm.
To date, the most effective way to control Hum level is to go outdoors, away from buildings. Buildings play a dominant role in the perception of the Hum, in particular, the construction, shape and the type of ground on which they stand. When people are first affected they can only “hear” the Hum inside a building, and it usually takes a year or so before they “hear” it both indoors and outdoors.
It is a simple matter to demonstrate the presence of gravity waves, however, quantitative measurement requires special equipment.
This is the present state of affairs and unfortunately no one has yet found a way of providing protection.

Gravitational Effects on Humans
Changes in gravity can suppress the human immune system, the change affects a type of white blood cell that defends the body against disease.
It has been known since the start of human space flight that changes in gravity make astronauts susceptible to illness, 15 of the 29 Apollo astronauts contracted bacterial or viral infections either during their mission or within a week of returning to Earth. During the Skylab missions all astronauts experienced a decrease in white blood cell responses.
All life on Earth has evolved in the presence of a stable gravitational field, if this field is removed or altered biological processes can go awry.
Long term exposure to microgravity can trigger detrimental physiological responses in the human, body and there is a long list of such effects.
The main effect which concerns us here are the effects on the inner ear.
Receptors in the inner ear allow humans to sense direction and gravity, returning astronauts experience the following symptoms, loss of balance and coordination, nausea, headache, lethargy, overheating, nasal congestion and sleep disturbance.
If you are a Hum sufferer, do these sound familiar?

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