Abnormal Psychology: This is the branch of psychology that studies unusual patterns of behavior, emotion and thought which may or may not be understood as precipitating a mental disorder.
Anxiety Disorders: These are types of mental disorders characterized by feelings of anxiety and fear including panic attacks, obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD).
Personality Disorders: These are enduring patterns of inner experience and behavior that deviates from the expectations of the culture. Examples include antisocial personality disorder and borderline personality disorder.