Mania involves flight of ideas, extreme elevated mood, impulsive behavior, talkative, delusions of grandeur, hyperactive, not tired, and needs less sleep. A person will have mood swings from mania to depression. Usually lithium is used to stabilize a person with bipolar disorder. Delusion is a wrong interpretation of reality which logic can not change. There are paranoid delusions of jealousy, persecution, someone is after them, someone is trying to kill them, or poison them.
Hallucinations are internal impulses projected onto images in the real world.
Most common is hearing voices. Some see things that are not there. Some researchers think that it is the result of problems with the chemical neurotransmitter dopamine. Doctors prescribe anti-psychotic mediation. Physical Much abnormal behavior is do the result of dealing with stress.