The concept of “inflammation beacon” is something I developed over the course of more than a decade, based on my work with clinicians, super-users of ICES-PEMF, and neurophysiologists. The concept is based on two different aspects of the physiology of pain.
First, pain is processed on the brain cortex using a focusing process called “lateral inhibition”. This allows the brain to focus on whatever is most important, and mainly ignore the rest. The practical result is that the brain focuses on its primary, largest pain signal, and the other pain signals get turned down so you feel them less.
The other physiological mechanism is that local cytokines if present chronically can eventually cause systemic inflammatory effects, far from the initial and chronic injury. So, localized inflammation from a chronic injury can eventually cause systemic inflammation, even if it is at a lower level of inflammation farther from the initial injury.
Taken together, this means that a local injury that never really heals can eventually cause inflammation far from the location of the initial injury. These areas can therefore also become painful, but generally less so than the initial injury.
The strange sensory effect happens when you reduce the inflammation at the initial injury site. The pain there is reduced, so the lower pain signals at farther locations moves into the foreground of your consciousness. The key is that the other pain signals were always there, but they were suppressed in the cortex of the brain by lateral inhibition from the much larger pain signal from the initial injury.
This makes it feel like once you manage to reduce the pain at your initial injury, gee whiz, all of a sudden everything else everywhere else hurts. At that moment, some people view PEMF as harmful to them and discontinue using it, even though it is really working for them and they just have the temporary illusion of more widespread pain. But typically the feeling of more widespread pain subsides with continued use of the PEMF, especially if you can continue to use it on the initial injury, which, counter-intuitively, may not even be painful anymore, for about 1-2 weeks.
When the initial injury finally heals, and the inflammation at that site subsides, then it “quenches the inflammatory beacon”; it is no longer sending out pro-inflammatory signals throughout the body. So, the aches and pains far from the initial injury become less inflammed and therefore less painful, just by fully treating the initial injury.
Hint: for this reason, you don’t need to try to chase these other aches and pains around with PEMF. Mainly you want to keep using PEMF on the initial injury, even after it stops being painful (for about an additional 2 weeks), to allow the tissue to fully recover and prevent future inflammation.