Psychiatric disorder means a mental disorder or illness that interferes with the way a person behaves, interacts with others, and functions in daily life. The Diagnostic and Statistical Manual (DSM) of Mental Disorders, published by the American Psychiatric Association, classifies psychiatric disorders.
Psychiatric disorders, including depression, schizophrenia, and bipolar disorder, affect millions of people around the world. Without intervention, they can have devastating effects and interfere with daily life. Decades of research led to a variety of therapeutic options for people with psychiatric disorders, but how well they work varies greatly from person to person.