Depression is a mental illness and is one of the more common ones.
Depression is characterised by significant and persistent depression and is the main type of mood disorder.
Clinically, depressed mood is seen to be out of proportion to its situation, and the depression can range from sullenness to grief, low self-esteem and depression, and even pessimism, with suicide attempts or behaviour, and even xylophobia. Some patients may have marked anxiety and motor agitation, and in severe cases, psychotic symptoms such as hallucinations and delusions may occur.
Therefore, depression is a typical psychiatric disorder and should be actively treated at a psychiatric psychiatry department.