Schizophrenia is a serious mental illness characterized by incoherent or illogical thoughts, bizarre behavior and speech, and delusions or hallucinations, such as hearing voices. Schizophrenia typically begins in early adulthood.  

Although the above symptoms must be present for at least one (1) month, there also needs to be continuous signs of the disturbance that persist for at least six (6) months.  During this period, the signs of the disorder may be present in a milder form, for instance as just odd beliefs or unusual perceptual experiences. During this 6 month period, at least two of the above criteria must be met, or only the criteria of Negative Symptoms must be present — if even just in milder form.