Abstract: Schizophrenia is a chronic mental illness characterized by positive, negative and cognitive symptoms. Positive symptoms consist of hallucinations, delusions, disorganized behavior and disorganized speech. Negative symptoms consist of alogia, anhedonia, asociality, affective flattening and impaired attention and concentration. Cognitive symptoms consist of impairment in working memory and executive functioning. Schizophrenia presents in various symptom cluster other than typical of schizophrenia with positive and negative symptoms. Obsessive - compulsive symptoms also occur frequently in patients with schizophrenia but they are not considered essential elements of schizophrenia.