[What scientific evidence do the current classifications have in order to assess occupational disability in patients...

Central sensitisation syndrome includes disorders such as fibromyalgia, chronic fatigue syndrome, multiple chemical sensitivity, and electromagnetic sensitivity syndrome. These disorders have been acquiring both medical and social relevance due to the increase in prevalence, the absence of a curative treatment, the limitations they cause, and the high healthcare costs they involve. Furthermore, all of them share an unknown aetiology and the absence of objective parameters to establish their diagnosis and severity. Multiple methods and classifications have been proposed to graduate the disability of these patients, but currently none of them have obtained sufficient evidence.