Irritability in depression can be a symptom of mixed depression.
Benazzi
Franco
F
D015415:Biomarkers; D001714:Bipolar Disorder / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D015897:Comorbidity; D003865:Major Depressive Disorder / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D006801:Humans; D007508:Irritable Mood; D012720:Severity of Illness Index; D009626:Terminology as Topic
D015415:Biomarkers