By the end of this section, you will be able to: Understand the problems inherent in defining the concept of psychological disorder Describe what is meant by harmful dysfunction Identify the formal criteria that thoughts, feelings, and behaviors must meet to be considered abnormal and, thus, symptomatic of a psychological disorder According to the American Psychiatric Association, a psychological disorder, or mental disorder, is “a syndrome characterized by clinically significant disturbance in an individual's cognition, emotion regulation, or behavior that reflects a dysfunction in the psychological, biological, or developmental processes underlying mental functioning. Mental disorders are usually associated with significant distress in social, occupational, or other important activities” (2013). Psychopathology is the study of psychological disorders, including their symptoms, etiology (i.e., their causes), and treatment. The term psychopathology can also refer to the manifestation of a psychological disorder. Although consensus can be difficult, it is extremely important for mental health professionals to agree on what kinds of thoughts, feelings, and behaviors are truly abnormal in the sense that they genuinely indicate the presence of psychopathology. Certain patterns of behavior and inner experience can easily be labeled as abnormal and clearly signify some kind of psychological disturbance. The person who washes their hands 40 times per day and the person who claims to hear the voices of demons exhibit behaviors and inner experiences that most would regard as abnormal: beliefs and behaviors that suggest the existence of a psychological disorder. But, consider the nervousness a young man feels when talking to an attractive person or the loneliness and longing for home a first-year student experiences during her first semester of college—these feelings may not be regularly present, but they fall in the range of normal. So, what kinds of thoughts, feelings, and behaviors represent a true psychological disorder? Psychologists work to distinguish psychological disorders from inner experiences and behaviors that are merely situational, idiosyncratic, or unconventional. Mental health issues are often incorrectly viewed as less important than physical illnesses, and sometimes people are blamed or otherwise stigmatized for their condition. People with mental illnesses did not choose or create their illness, and cannot simply manage it through positive thinking or other attitudinal changes. Diagnosis, treatment, and support are all necessary, and all must be considered with respect and sensitivity to the extremely challenging nature of mental illness. While not everyone experiencing difficulty has a psychological disorder, mental health is critical to our ability to function in our relationships, education, and work. It is important that people talk with qualified professionals if they are having persistent feelings or experiences in line with the descriptions below; the discussion may or may not lead to a diagnosis, but as with physical illnesses, one has a better chance at success if they raise the issues with doctors or other experts.

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