Schizophrenia occurs in 1% of the population and is a disorder that usually develops before the age of 25 and lasts a lifetime. Common symptoms are as follows: 1. Delusions (1) Relationship delusions: False beliefs that others’ words and actions are directed at them; that some events have special meaning to them; false beliefs that others’ conversations are about them. (2) Delusions of victimization: wrongly believing that one is being harassed, deceived, or persecuted. (3) Delusion of being controlled: wrongly feeling that one’s willpower, thinking and feeling are controlled by external forces. (4) Jealous delusion: wrongly believing that one’s spouse is unfaithful to oneself. (5) Non-descent delusion: The mistaken belief that one’s parents are not biological. (6) Love delusion: The false belief that someone is deeply in love with you. (7) Exaggerated delusion: one’s importance, power, ability, and status are exaggerated. (2) Hallucinations: Information that is wrongly perceived without stimulation by something outside. (3) Speech disorder (4) Disintegrative symptoms or miosis (5) Negative symptoms (e.g., flat affect, poor speech, lack of willpower) (6) Onset usually does not consider oneself to be suffering from mental illness.