Most patients also, at other times, have one or more depressive episodes, and all experience a hypomanic stage before progressing to full mania. It is a type of bipolar disorder, and conforms to article on bipolar disorder pdf classic concept of manic-depressive illness, which can include psychosis during mood episodes.
Often, individuals have had one or more major depressive episodes. Episodes of substance-induced mood disorder due to the direct effects of a medication, or other somatic treatments for depression, drug abuse, or toxin exposure, or of mood disorder due to a general medical condition need to be excluded before a diagnosis of bipolar I disorder can be made. In addition, the episodes must not be better accounted for by schizoaffective disorder or superimposed on schizophrenia, schizophreniform disorder, delusional disorder, or a psychotic disorder not otherwise specified.
This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. Routine medical assessments are often prescribed to rule-out or identify a somatic cause for bipolar I symptoms.