Diagnosable mental disorder . Changes in thinking, mood, or behavior that cause distress or increase the risk of death, pain or disability. Includes attention deficit disorder, anxiety disorders, Alzheimer's disease, as well as major disorders listed below. A brain ailment resulting in the loss of the ability to distinguish reality from fantasy.
Sufferers often hear voices.
It does not mean split personality. Bipolar disorder . Also known as manic-depression, it features episodes of mania and depression. Symptoms include mood swings, inflated self-esteem, impaired judgment. Major depression .