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

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.