Common types of mental illnesses include: dementia, disorder due to psychoactive drug use (e.g. alcohol, opiate, stimulant etc), psychotic disorder, mood disorder (including depressive disorder, bipolar affective disorder), neurotic disorder (including anxiety disorder, phobic disorder, obsessive compulsive disorder), eating disorder, disorder in childhood and adolescence (including autism, attention deficit hyperactivity disorder, conduct disorder).

You can refer to the following website.

The common types of mental illness

The source of information is provided by the Hospital Authority Castle Peak Hospital