This document summarizes the heterogeneity of depressive disorders and argues for a more nuanced diagnostic approach that considers clinical phenomenology over checklists of diagnostic criteria. It outlines four main types of depression - melancholic, neurotic, mixed, and pure. Neurotic depression in particular is described as having less severe but more chronic depression with prominent anxiety symptoms and sensitivity to psychosocial stressors. The origins of modern diagnoses like major depressive disorder are discussed, arguing they were constructed for professional rather than scientific reasons and encompass a broad range of conditions.