Pathophysiological mechanisms of fibromyalgia

Area of Science:

• Neuroscience
• Pain Medicine
• Rheumatology

Background:

• Fibromyalgia pain arises from a complex interplay of nociceptive, neuropathic, central nervous system dysregulation, and psychosomatic factors.
• Nociceptive pain involves sensitized nociceptors due to metabolic issues and neurogenic inflammation, common in fibromyalgia tender points.
• Neuropathic pain in fibromyalgia may stem from nerve cell and fiber pathologies, including compression or regeneration, leading to hyperexcitability.

Purpose of the Study:

• To elucidate the multifaceted mechanisms underlying pain in fibromyalgia.
• To differentiate and explain the roles of nociceptive, neuropathic, and dysregulatory pain pathways.
• To highlight the contribution of central nervous system dysfunction to fibromyalgia pain.

Main Methods:

• Review and synthesis of existing literature on fibromyalgia pain pathophysiology.
• Analysis of proposed mechanisms including neuroinflammation, nerve compression, axonal transport disturbances, and central nervous system control loops.
• Examination of the role of substance P and neuropeptides in nociceptor sensitization.

Main Results:

• Fibromyalgia pain is characterized by sensitized nociceptors, neuropathic alterations, and dysregulated central nervous system pain control.
• Metabolic deficiencies and neurogenic inflammation contribute to hyperalgesia in tender points.
• Dysfunctional efferent control loops and abnormal spinal reflex transmission create a pain-muscle tension cycle.

Conclusions:

• Fibromyalgia pain is a complex condition involving multiple interacting pathophysiological mechanisms.
• Understanding these mechanisms, including neuropathic and dysregulatory components, is key to effective pain management.
• Aberrant central nervous system control and neuroplastic changes significantly contribute to the chronic pain experience in fibromyalgia.