Define occasional: of or relating to a particular occasion; created for a particular occasion â occasional in a sentence of or relating to a particular occasion; created for a particular occasion; acting as the occasion or contributing cause of somethingâ¦
The list of types of Mental illness mentioned in various sources includes: 1  Depressive disorders. 2  Depression. 3  Dysthymic disorder. 4  Bipolar disorder. 5  Cyclothymic disorder. 6  Anxiety disorders. 7  Panic disorder. 8  Social phobia. 9  Specific phobias.
Serious Mental Illness. Serious mental illness (SMI) is defined as a mental, behavioral, or emotional disorder resulting in serious functional impairment, which substantially interferes with or limits one or more major life activities. The burden of mental illnesses is particularly concentrated among those who experience disability due to SMI.