A personality disorder is a type of mental health disorder that affects how a person views themselves and others. A person with a personality disorder finds it challenging to interact with others in healthy way because they have difficulty relating to people and situations resulting due to their rigid and unhealthy thought patterns.
Diagnosing someone with a personality disorder can be difficult due to individuals not being aware that they have a disorder. Because of their inability to be self-aware about their unhealthy thinking and behavior, when confronted they may come off as narcissistic, moody, and dramatic. They may not think they have a problem, and they may even think the problem is with others.