Depression can be situational or biochemical, I'm not sure what the actual terms are for it. Situational can be fixed by exercising, eating well, etc. Biochemical? I have that - my brain doesn't work right, I have to have meds for it, otherwise I am nothing.  Depression is a sore spot for me (clearly) - so many people abuse the term that it means almost nothing I feel like. Especially tubblrinas, they make mental illness a joke by making it up.