Determining Criteria for Psychological Disorders

Defining psychological disorders is essential for clinicians and researchers to ensure accurate diagnosis and treatment. The DSM-5, a critical tool in this process, outlines several key criteria that differentiate a psychological disorder from normal behavior. These criteria encompass the nature of the symptoms, the duration, their impact on functioning, and cultural considerations. Which of the following criteria is most fundamental in determining whether an individual's behavior qualifies as a psychological disorder?