Severe depression can have various causes, just like most other symptoms. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose severe depression, we could:
Whether you have depression now, past depressive episodes or both, how severe is/was it?
Possible responses:→ Not applicable / don't know
→ Mild - I can mask it as needed
→ Moderate - I am still able to function
→ Serious - it affects all that I do