"this disorder, which literally means "splitting of the mind," affects less than 1 percent of the population; people who are affected have trouble distinguishing whether their thoughts, perceptions, and experiences are real or imagined."

Schizophrenia, not to be confused with Multiple Personality Disorder. Psychological symptoms include: hallucination, paranoia, hearing voices, depression, fear, persecutory delusion, or religious delusion. 1.1% of the population suffers from Schizophrenia as estimated in 2014.