In simple terms, everything in this category places stress on the body. Most of these phenomena are subtle, yet can have major impacts on the body and your health. Each category will go into more detail.
The effects of these forces can be mitigated, or they can be avoided. Mitigation is performed by a building biologist or dowser (see the webite from Geovital for an outline of what to look for in a tester). This can get pricey, but the effects of mitigation on health are quite significant.
The following link contains some information on how to test for these phenomena:
Source: https://zenifyyourhome.wordpress.com/what-is-an-unhealthy-space/