Schizophrenia
Schizophrenia was a serious mental condition. It was often incorrectly generalized as having "split personalities"; although one type of the ailment presented this way, there were several different symptomologies, some causing, for example, a prolonged catatonic state. ()

By the 2020s, there were several effective treatments for schizophrenia that could cure the condition. People with schizophrenia were placed in the Sanctuary Districts and classed as "Dims". ()

In 2266, Dr. Leonard McCoy ruled out schizophrenia as the cause of Simon Van Gelder's insanity. ()

In 2399, after Dahj Asha, an android unaware of her status as such, did research about some odd things she was going through including auditory hallucinations, she concluded that she might have schizophrenia. An alternative idea was that she had had head trauma. ()

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de:Schizophrenie
Psychological conditions