mania symptoms to some degree occur during depressive syndromes in about 2/3 of people with bipolar i or ii disorder. depressive symptoms likewise often occur during manic or hypomanic episodes. if a full syndrome of both poles exists at the same time technically in bipolar i disorder that is called a mixed episode. such things likely also often happen in bipolar ii disorder but technically (again) the psychiatric nosology system doesn't for some reason identify that as a bona fide entity (mixed hypomania). most authorities believe that in the presence of any mania symptoms depressive symptoms worsen if antidepressants are used and mixed episodes are fundamentally thought of as variants of mania rather than depression.
is it possible to have both depression and hyomania at the same time?