The exact cause of personality disorders is unclear. However, genetics, neurological differences, and environmental factors may contribute to the development of these complex mental health conditions.

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.

The theory of types of borderline personality disorder (BPD) is controversial. There is some debate over whether there are various types and what those types may be. BPD is a mental health condition ...

Bipolar disorder is a long-term mood disorder characterized by major fluctuations in mood — both high and low — that can impact daily functioning and behavior. Although bipolar disorder is a chronic ...

Credit: Getty Images Some rare psychological disorders may occur so infrequently that most mental health professionals might never encounter them. Approximately 1 of every 5 adults in the United ...

Suchandrima Bhowmik has written over 300 articles on various health conditions, medical news, and recent breakthroughs. Her work appears in several publications, including Medical News Today, ...

Medically reviewed by Michael MacIntyre, MD Key Takeaways Substance use disorder makes it hard to stop using substances even when they're harmful.Using the term "substance use disorder" helps separate ...

The prevalence, clinical characteristics and medical consequences of eating disorders in people with type 1 diabetes have received increasing attention since reports of this dangerous combination were ...