Autoimmune disease may almost double risk of mental ill health, study suggests (theguardian.com)

Worth noting: "The study was limited by a lack of available information on the time or duration of illness, making it impossible to determine whether autoimmune conditions preceded, co-occurred with or followed affective disorders."

And the article's link to ththe study itself is broken, it should go to: https://mentalhealth.bmj.com/content/27/1/e301252