Most people think of personality traits as set in stone. We consider them to be as fixed as our eye color. For example, you might tell yourself, “I’m just a perfectionist,” or “I’m the type of person ...

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.

Some people believe personality is fixed, but more recent research suggests that personality may develop over time and that people’s personality traits can change. Personality types group people into ...