Intense nihilism, somatization and agitation in old age are the hallmark symptoms of -
sol:Involutional melanocholia has following featurs
i) Involutional (old) age group
ii) Melanocholia (multiple somatic symptoms → somatization)
iii) Psychomotor agitation / Retardation
iv) Psychotic features (delusion of nilism, guilt, perseution, Hypochondriacal; Hallucinations).
Atypical depression is characterized by increased appetite / increased weight, increased sleep (hypersomnia), Lethargy, Rejection sensitivity.
For somatized depression see previous explanation.
Depressive stupor occurs in severe depression where the person is akinetic (immobile) and mute.