啥意思？？

Organic psychiatric disorders, such as major depression, have also been associated with FMS, with up to 50% to 70% of patients with FMS having a history of major depression and up to 33% having major depression at the time of FMS diagnosis. Alternatively, many patients diagnosed with major depression experience sleep disturbance, fatigue, and diffuse musculoskeletal pain. Three potential explanations may account for this association. (1) Depression and FMS may both be clinical manifestations of the affective spectrum disorders, and their presence in an individual patient is coincidental rather than causal. (2) Major depression may lead to alterations of the neuro-psycho-immuno-endocrine system such that it leads to the development of FMS. In a similar fashion, FMS may lead to the development of major depression. (3) FMS and major depression may represent a single syndrome, with the diagnosis in a particular patient dependent on the major clinical manifestations present.

Organic psychiatric disorders、affective spectrum disorder啥意思？