Key Criterion in Defining Psychological Disorders

The classification and definition of psychological disorders often involve distinguishing between symptoms, duration, and impairment. Various frameworks like the DSM-5 emphasize that psychological disorders should significantly impact an individual's functioning, as opposed to being transient or culturally normative behaviors. This leads us to explore what constitutes a disorder versus typical psychological functioning.

Which of the following criteria is most essential in determining whether a psychological condition should be classified as a disorder?