Fibromyalgia: Understanding Widespread Pain and Central Sensitisation

What Is Fibromyalgia?

Fibromyalgia is a chronic widespread pain condition characterised by diffuse musculoskeletal pain, fatigue, non-restorative sleep, cognitive difficulties (commonly called "fibro fog"), and a range of associated symptoms including headache, irritable bowel syndrome, bladder urgency, and heightened sensitivity to sensory stimuli (light, sound, temperature, and touch). It affects approximately 2–4% of the population, with a marked female predominance (roughly 7:1). For many years, fibromyalgia was dismissed as a psychosomatic or non-organic condition — an unfair and inaccurate characterisation that left patients without appropriate care and understanding. Contemporary neuroscience has established fibromyalgia as a disorder of central pain processing — a condition with identifiable neurological mechanisms, not one that exists solely in the patient's imagination.

The Neuroscience: Central Sensitisation

The core mechanism of fibromyalgia is central sensitisation — an amplification of pain signals within the central nervous system that lowers the threshold at which stimuli are perceived as painful. In a healthy nervous system, pain signals from peripheral tissues are modulated at multiple levels of the neuraxis: the spinal cord gate-control mechanisms and descending inhibitory pathways from the brain reduce noise and filter out low-level stimulation. In fibromyalgia, this descending inhibition is impaired and central sensitisation is established: the spinal cord dorsal horn becomes hyperexcitable, responding to normally innocuous stimuli with pain signals (allodynia) and amplifying noxious stimuli (hyperalgesia). Functional neuroimaging demonstrates altered brain activation patterns in fibromyalgia — particularly abnormal activity in pain-processing regions including the insula, anterior cingulate cortex, and thalamus. Neurotransmitter imbalances (reduced serotonin and noradrenaline, elevated substance P) further perpetuate the sensitised state.

Diagnosis

The 2016 American College of Rheumatology (ACR) diagnostic criteria for fibromyalgia do not require tender point examination — they rely on three elements: a widespread pain index (WPI) score documenting the number of painful body regions; a symptom severity (SS) scale scoring fatigue, sleep, and cognitive symptoms; and the absence of another disorder that would better explain the pain. A diagnosis of fibromyalgia does not exclude the coexistence of other conditions — fibromyalgia frequently co-occurs with inflammatory arthritis, osteoarthritis, and other musculoskeletal conditions, amplifying pain from those conditions. Investigation is used primarily to exclude structural pathology and inflammatory arthritis, not to "confirm" fibromyalgia, which remains a clinical diagnosis.

Evidence-Based Management

Fibromyalgia requires a multimodal management approach — no single intervention produces complete resolution, but combinations of the following produce meaningful improvement in the majority of patients. Exercise is the most strongly evidence-supported intervention: aerobic exercise (walking, swimming, cycling) at moderate intensity, built progressively from very low starting doses to avoid post-exertional flares, consistently reduces pain, improves function, and enhances central inhibitory capacity. Resistance training provides additional benefit. Patient education — pain neuroscience education that explains the mechanism of central sensitisation, removes catastrophising, and reframes the pain experience — is associated with significant improvements in pain, disability, and treatment adherence. Cognitive-behavioural therapy (CBT) and acceptance and commitment therapy (ACT) address the psychological contributors to pain amplification. Pharmacological options include duloxetine, milnacipran (SNRIs that enhance descending inhibition), pregabalin, and low-dose amitriptyline for sleep — though effect sizes are modest and medication is best combined with non-pharmacological strategies. Manual therapy and myotherapy provide symptomatic relief and support exercise participation, but should not be used as isolated, passive treatments.

Living Well with Fibromyalgia

Pacing — balancing activity and rest to avoid the boom-bust cycle of overdoing on good days and crashing on bad ones — is a cornerstone of self-management. Sleep hygiene is critical: restorative sleep reduces central sensitisation, while sleep deprivation consistently worsens symptoms. Stress management through mindfulness, relaxation, and social support reduces the neuroendocrine amplification of pain. Fibromyalgia is a manageable condition — not curable in the traditional sense, but responsive to a committed, multidisciplinary approach that addresses the nervous system as the primary site of intervention.