Fibromyalgia is characterized by chronic widespread pain, fatigue, sleep disturbances and functional symptoms. The etiopathogenesis, diagnostic criteria and classification criteria of fibromyalgia are still debated and, consequently, so are the strategies for treating this condition. Fibromyalgia is the third most frequent musculoskeletal condition, and its prevalence increases with age. However, although diagnosis has improved with the evolution of more accurate diagnostic criteria, a considerable proportion of physicians still fail to recognize the syndrome. Many factors contribute to the development of fibromyalgia in a unique manner: genetic predisposition, personal experiences, emotional-cognitive factors, the mind-body relationship and a biopsychological ability to cope with stress. The multiple components of the pathogenesis and maintenance of the condition necessitate a multi-modal treatment approach. Individually tailored treatment is an important consideration, with the increasing recognition that different fibromyalgia subgroups exist with different clinical characteristics. Consequently, although an evidence-based approach to fibromyalgia management is always desirable, the approach of physicians is inevitably empirical, and must have the aim of creating a strong alliance with the patient and formulating shared, realistic treatment goals.

Fibromyalgia: an update on clinical characteristics, aetiopathogenesis and treatment

AAPT Diagnostic Criteria for Fibromyalgia.

The how and why of arm swing during human walking

Motor automaticity in Parkinson's disease.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/jabr.12137

The neurobiology of central sensitization

Patients with functional pain disorders often complain of generalized sensory hypersensitivity, finding sounds, smells, or even everyday light aversive. The neural basis for this aversion is unknown, but it cannot be attributed to a general increase in cortical sensory processing. Here, we quantified the threshold for aversion to light in patients with fibromyalgia, a pain disorder thought to reflect dysregulation of pain-modulating systems in the brain. These individuals expressed discomfort at light levels substantially lower than that of healthy control subjects. Complementary studies in lightly anesthetized rat demonstrated that a subset of identified pain-modulating neurons in the rostral ventromedial medulla unexpectedly responds to light. Approximately half of the pain-facilitating "ON-cells" and pain-inhibiting "OFF-cells" sampled exhibited a change in firing with light exposure, shifting the system to a pronociceptive state with the activation of ON-cells and suppression of OFF-cell firing. The change in neuronal firing did not require a trigeminal or posterior thalamic relay, but it was blocked by the inactivation of the olivary pretectal nucleus. Light exposure also resulted in a measurable but modest decrease in the threshold for heat-evoked paw withdrawal, as would be expected with engagement of this pain-modulating circuitry. These data demonstrate integration of information about light intensity with somatic input at the level of single pain-modulating neurons in the brain stem of the rat under basal conditions. Taken together, our findings in rodents and humans provide a novel mechanism for abnormal photosensitivity and suggest that light has the potential to engage pain-modulating systems such that normally innocuous inputs are perceived as aversive or even painful.

A possible neural mechanism for photosensitivity in chronic pain.

Background:Results of previous studies suggest that β-adrenoreceptor activation may augment pain, and that β-adrenoreceptor antagonists may be effective in reducing pain, particularly in individuals not homozygous for the catechol-O-methyltransferase (COMT) high-activity haplotype.Materials and Meth

Results of a pilot multicenter genotype-based randomized placebo-controlled trial of propranolol to reduce pain after major thermal burn injury.

Arm Swing Magnitude and Asymmetry During Gait in the Early Stages of Parkinson's Disease

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A possible neural mechanism for photosensitivity in chronic pain.

Results of a pilot multicenter genotype-based randomized placebo-controlled trial of propranolol to reduce pain after major thermal burn injury.

Arm Swing Magnitude and Asymmetry During Gait in the Early Stages of Parkinson's Disease