Mental disorders are classified into four main categories. The types of mental illnesses are:
Anxiety disorder: This type of mental disorder causes people to experience bouts of fear and distress. Examples of anxiety disorders are social phobia, panic disorders, Obsessive-compulsive disorder (OCD), Post-traumatic stress disorder (PTSD), generalized anxiety disorder, and specific phobia.
Mood disorder: This type of mental disorder involves persistent feelings of sadness or periods of feeling very happy. It can also be fluctuations from extreme happiness to extreme sadness. Examples are depression and bipolar disorder.
Psychotic disorder: this type of mental disorder involves a distorted view of reality marked by deranged personality. Examples are schizophrenia, delusions, and drug-induced psychosis.
Personality and eating disorders are also classified as types of mental illness.