In this chapter, the authors provide a broad overview of diagnosable psychiatric disorders, their symptoms, and examples of current theoretical and empirical thought underlying these conditions. In providing a primer concerning mental health, they first review the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5), with respect to how psychopathology is defined and the nature of the diagnostic system. They then shift to definitions, key examples, and example theories for (i) clinical disorders (e.g., depressive and anxiety disorders), (ii) personality disorders (with an emphasis on borderline and antisocial personality disorders), and (iii) substance use disorders. While this chapter draws heavily from the DSM-5, such is done primarily for educational and illustrative purposes within the broader context of discussing key issues related to the behavioral science of firearms.
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