There are numerous classifications or divisions of depression. They are divided into:
- Psychogenic depression – neurotic or reactive depressive disorders.
- Endogenous depression – dispositional, that is, inherited.
- Somatogenic depression – organic, physical, or caused by other underlying diseases.
Another classification is based on the assumed cause of the depression:
- Primary depression – depression that has no obvious physical or psychological causes.
- Secondary depression – depression that occurs due to drug intoxication/withdrawal or as a result of another illness or medication use
Another classification, also based on the assumed cause, divided into:
- Endogenous depression – arises, like primary depression, “from within”.
- Reactive depression – this is also called exogenous depression – arises due to drastic events such as divorce, unemployment, death, etc.
Another classification (DSM-IV-TR) is based on the severity of depression:
- Major depression (English major depressive disorder).
- Minor depression (engl. minor depressive disorder).
In the ICD-10 international classification system (Chapter V “Mental and behavioral disorders, affective disorders – F30-F39”), depressive disorders are defined as psychopathological syndromes of specific duration within the diagnostic category of “affective disorders”:
- F30 Manic episode
- F31 Bipolar affective disorder
- F32 Depressive episode
- F33 Recurrent depressive disorder
- F34 Persistent affective disorders
- F38 Other affective disorders
- F39 Unspecified affective disorders
