As outlined by Swiss psychiatrist Eugen Bleuler (1857-1939), those indications of schizophrenia, including delusions and hallucinations, which are common in various other conditions thereby not expressly diagnostic of schizophrenia. Bleuler theorized that these kinds of indicators do not arise explicitly from the disorder, but actually start to function when the individual responds to any internal or external experience. Indicators which are not directly tied to a disorder, but which are correlated with or subordinate to indicators which are. Indicators which arise in the second stage of a disorder or which are subsequent to a previous traumatic occurrence, disease function, or chaotic circumstances.
SECONDARY SYMPTOMS 1: "Secondary symptoms can be even deadlier than the original symptoms of a disorder."