The document provides an outline and introduction to schizophrenia. It defines schizophrenia as a severe mental disorder characterized by distortions in thinking, perception, emotions, sense of self and behavior. The incidence is about 1% globally, with onset typically occurring in late adolescence or early adulthood. Potential causes discussed include genetic and biological factors such as changes in neurotransmitters like dopamine, as well as psychological factors such as certain personality traits and cognitive biases.