Because the nature of acute<unk>  is similar to<unk> , it is difficult to differentiate normal levels of<unk>  in patients with<unk>  from depressive levels in<unk> . "Prominent subjectively low mood, suggesting<unk> , and prominent blunting of affect, suggesting negative symptoms, are the two features which are most helpful in differentiating<unk>  and<unk> ." A number of researchers believe that<unk>  is actually a symptom of<unk>  that has been hidden by the psychosis. However, symptoms usually arise after the first psychotic episodes if they will arise at all. Officially, diagnosing<unk>  in a patient requires for the patient to be experiencing a depressive episode of either short or long term following the overcoming of<unk> . The patient must still demonstrate some<unk>  symptoms but those symptoms must no longer be the focus of the illness. Typically, the depressive symptoms are not severe enough to be classified as a severe depressive episode. Formally, diagnosis entails the patient having had<unk>  within the past year, a number of<unk>  symptoms, and<unk>  being present for two weeks or more. Mild<unk>  signs may be withdrawing socially, agitation or hostility, and irregular sleep such as in the case of insomnia and hypersomnia.
Post-schizophrenic depression
Unitary psychosis
Substance-induced psychosis
Tardive psychosis
Brief psychotic disorder
Pseudoneurotic schizophrenia
Outline of bipolar disorder
Secondary mania