| A | B |
| organic disorder | one that is clearly caused by a physical illness or an injury that affects the brain |
| functional disorder | may occur as a result of psychological causes in which no clear brain damage is involved |
| anxiety disorder | an illness in which real, imagined, or persistent fears prevent a person from enjoying life |
| phobia | an anxiety disorder in which the person has an irrational fear that prevents him/her from leading a normal life |
| obsessive-compulsive disorder (OCD) | an anxiety disorder in which the person is trapped in a pattern of repeated behaviors or thoughts |
| panic disorder | an anxiety disorder in which fear or anxiety prevails and gets in the way of functioning and enjoying life |
| post-traumatic stress disorder | an anxiety disorder in which a person who has experienced or witnessed a traumatic event feels severe and long-lasting aftereffects |
| somatoform disorder | an illness in which a person complains of disease symptoms, but no physical cause can be found |
| hypochondria | a somatoform disorder in which the person is preoccupied with the body and fear of presumed diseases that are not present |
| affective disorders | an illness often with an organic cause that relates to emotions and may involve mood swings or mood extremes that intefere with everyday living |
| clinical depression | an affective disorder in which feelings of saddness, hopelessness, and despair last for more than a few weeks and intefere with daily activities and interests |
| bipolar disorder | a psychological illness characterized by extreme mood swings between depression and extreme happiness, or mania |
| personality disorders | a variety of psychological conditions that affect a person's ability to get along with others |
| antisocial personality disorder | this personality disorder is characterized by a person's constant conflict with society |
| passive-aggressive personality disorder | a personality disorder in which these individuals resent being told what to do, yet they rely on others' direction |
| schizophrenia | a serious mental disorder meaning "split mind" |