The interview may reveal obsessions (unwanted and distressing thoughts or impulses), compulsions (excessive, repetitive, purposeful behaviors that a person feels driven to do), and delusions (fixed false beliefs that are firmly held despite evidence to the contrary) and may determine whether distress is expressed in physical symptoms (eg, headache, abdominal pain), mental symptoms (eg, phobic behavior, depression), or social behavior (eg, withdrawal, rebelliousness).