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The crucial thing to remember with fibromyalgia is that the nervous system is stuck in the stress response (Martínez-Lavín 2012, 1998). In fact, all symptoms of fibromyalgia, including excessive pain, are the result of a complex chain reaction set off by a hyperactive stress response. The stress response is an automatic brain reflex that is commonly referred to as the “fight or flight” instinct. It has little to do with feeling stressed out. Rather, it refers to the body’s automatic response to danger, triggered by a primal brain area whose only focus is on survival. When a potential threat is detected—a loud banging on your front door, a stranger moving quickly toward you on the street—the brain prepares the body by pumping adrenaline and tightening muscles, readying your whole system for action. This is the body’s normal response to danger—great for a short-term response, and activated only when there is an imminent threat. In fibromyalgia, however, the stress response never stops, like a smoke alarm that goes off incessantly even though there’s no fire.
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Ginevra Liptan (The FibroManual: A Complete Fibromyalgia Treatment Guide for You and Your Doctor)