1. Depression with Atypical Features:
These Patients tend to have reverse of neurovegetative symptoms. For example: over eating & over sleep. They have younger age of onset & more severe psychomotor slowing. They also are more likely to have comorbid disorders like anxiety disorder, substance use disorder or somatic symptom disorder.
2. Depression with Catatonic Features:
Catatonic symptoms can be present in depressive disorder like stupor, blunted affect, extreme withdrawl, negativism and marked psychomotor retardation.
3. Post Partum Depression:
Onset of symptoms is within 4 weeks postpartum. Post Partum depression is commonly associated with psychotic symptoms.
4. Seasonal afffective Disorder:
Depressive episodes usually follow seasonal pattern, most commonly winter. Patients with seasonal affective disorder respond well to Light Therapy.
In Dysthymia, depressive symptoms are less severe but more chronic. Patients usually complain that they have always been depressed. Onset is usually early, beginning in childhood or adolescence. Late onset subtype (Middle age and geriatric) is less prevalent.
6. Recurrent Brief Depressive Disorder:
Depressive symptoms are present for a brief episode (less than 2 weeks ). symptoms are severe enough to meet the crieteria of Major Depressive Disorder but time duration is less than 2 weeks.
7. Double Depression:
Patients with Major Depressive Disorder who also meet the criteria for dysthymia are known to have double depression. This disorder has poor prognosis. Resolution of symptoms of major depressive disorder still leaves significant psychiatric impairment.