Schizophrenia occurs in 1% of the population and is a disorder that usually develops before the age of 25 and lasts for a lifetime. Common symptoms are as follows Delusions (1) Relationship delusions: False beliefs that what others say or do is directed at them; that some events have special meaning to them; false beliefs that others’ conversations are about them. (2) Delusions of victimization: False beliefs of being harassed, deceived, and 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 in the absence of stimuli from external things. (1) Auditory hallucinations (2) Visual hallucinations (3) Taste hallucinations (4) Touch hallucinations 3. Speech disorders 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 have a mental illness.