What types of hormonal changes may be caused by fibromyalgia ?

Low serotonin levels, low growth hormone levels, and low levels of neuropeptide Y, a component of the feel-good hormone neurotransmitter norepinephrine, have been associated with fibromyalgia. Elevated levels of substance P, a small protein hormone that acts as a neurotransmitter and signals the body to experience pain, have also been observed in the spinal chord of fibromyalgia patients.

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