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The Neuroscience of Fibromyalgia and Central Sensitization

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Fibromyalgia Syndrome

Abstract

Central sensitization was first described in the 1980s as a spinal mechanism of augmenting painful stimuli, causing hyperalgesia and allodynia. During the years to follow it was discovered that parts of the brain are also involved in this inadequate amplification of sensory inputs.

It is believed that chronic pain syndromes, including fibromyalgia, irritable bowel syndrome, endometriosis, etc., all share common features of central sensitization, and were therefore gathered under the definition of chronic overlapping pain conditions (COPC). However, central sensitization may also be secondary to other conditions, such as malignancy and autoimmune diseases, causing patients to suffer from fibromyalgia-like symptoms.

Central sensitization is thought to arise from both genetic and environmental triggers: Long-standing acute pain and psychosocial stress are suggested as major contributing factors to COPCs, but although some genetic predispositions were described, they have not yet been fully defined.

From a neurophysiologic perspective, it is known that chronic pain syndromes are associated with altered conditioned pain modulation (CPM), the body’s mechanism of suppressing painful stimuli. Neuroimaging studies in these patients show structural changes in different body areas, with alterations in neurotransmitter concentrations, both excitatory and inhibitory.

Our understanding of the pathophysiology of central sensitization is rapidly evolving, and current works also focus on immunologic alterations involved in the process, such as elevated interleukin levels and chronic inflammatory processes.

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Clauw, D.J., Tzadok, R. (2021). The Neuroscience of Fibromyalgia and Central Sensitization. In: Ablin, J.N., Shoenfeld, Y. (eds) Fibromyalgia Syndrome . Springer, Cham. https://doi.org/10.1007/978-3-030-78638-0_15

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