Schizophrenia is a severe mental disorder that affects about 1.1% of people over 18 in the US. There is no single known cause, and researchers are still working to understand it. Symptoms fall into three categories: positive (hallucinations, delusions), negative (lack of emotion/motivation), and cognitive (problems with memory, attention, decision making). Treatment focuses on antipsychotic medications to manage symptoms, though it does not cure the underlying disorder. Proper diagnosis can be difficult early on due to commonality of some symptoms with adolescence, but becomes clearer as hallucinations and delusions emerge.