Personality disorders affect an estimated 9% of Americans. Only a mental-health professional can diagnose a personality disorder, typically in adulthood. Insider compared the behaviors, traits, and ...

Borderline personality disorder (BPD) is one of several personality disorders described in the Diagnostic and Statistical Manual (DSM-5) by the American Psychiatric Association. BPD belongs to a group ...

Where mood disorders can cause temporary or fluctuating changes in mood, personality disorders cause symptoms that remain consistent over time and across a range of situations. For example, bipolar ...

Narcissistic personality disorder (NPD) is 1 of 10 clinically recognized personality disorders. Though NPD is only one official diagnosis, doctors further classify the condition into 2 types.

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