Schizophrenia is a severe brain disorder that makes it difficult to determine what is real and what is not. Symptoms vary widely and include problems with social skills, thoughts, mood, and perception. While there is no cure, treatment through medication, therapy, and lifestyle changes can help manage symptoms. Schizophrenia is usually diagnosed by a medical professional and believed to have genetic and environmental factors, though the exact causes are unknown. It most commonly develops during late adolescence and early adulthood.