Given the high level of autoimmune sufferers here, this story in today's Guardian seems potentially of relevance. Of course, I am not suggesting everyone with Hashimoto's has schizophrenia - rather, if an autoimmune disorder could be a factor in schizophrenia, then perhaps it could also be a factor in other mental health issues.
Radical new approach to schizophrenia treatment begins trial
Exclusive: as evidence emerges that schizophrenia could be an immune system disease, two-year trial will use antibody drug currently used for MS
British scientists have begun testing a radically new approach to treating schizophrenia based on emerging evidence that it could be a disease of the immune system.