[jmye]

Why is this downvoted? It's literally two of the questions on the PHQ9, which is used to, you know, diagnose/measure depression.

Maybe some of y'all should stick to the javascript threads and stop pretending to be experts in healthcare. Listen more, speak less, kids.

[Sharlin]

Many people unfortunately think that depression is like somatic diseases such as influenza, where we deduce the presence of a pathogen, a root cause, based on presented symptoms. But for depression (and many other mental health issues) we don't currently know any root cause(s) – all we can do is give names to sets of often-comorbid symptoms.