EMF is the acronym for electro magnetic field. All living organisms have an electrical current. We, as humans, emanate a measurable hertz frequency.
Electrical things that we manufacture also have an electro-magnetic frequency and field. There are devices that stimulate the body to heal through the application of their electrical current. Unfortunately, many of our most treasured devices radiate an electrical frequency and field that is not harmonious for us and most living things. Those fields interfere with our cells natural cycles.
When we have very intense or repeated exposure to unhealthful EMF’s, our cells alter from their natural frequencies and become free radicals or diseased.
Commons sources of problematic EMF's are microwave, computers, cell phones, electric bedside clocks, and electronics in general that are wireless or ionizing.