Paranoid personality disorder can lead to unwarranted distrust, jealousy, and feelings of persecution by others. This may affect all types of relationships. Various strategies can help people cope.

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.

HAMBURG — What is “normal” and what isn’t? This question is constantly being renegotiated in psychology. And sometimes, the boundaries shift, as they are now. What is considered a personality disorder ...