Still other research results point to a similar conclusion. For example, individuals with fibromyalgia are known to have an abnormally low pain threshold. They also have abnormally low levels in their spinal fluid of metabolites of two neurotransmitters—serotonin and norepinephrine—and abnormally high levels of substance P, an amplifier of pain messaging.
For more details about these findings, as well as information about treatments for fibromyalgia patients, see Psychiatric News. Information about fibromyalgia syndrome can also be found in American Psychiatric Publishing's Pain: What Psychiatrists Need to Know.