I do a whole unit on mental illness with my summer students, and the DSM is one of the main things that their AP Psych courses are getting wrong, so we have to spend some time reading/talking about it. Defining the difference between a syndrome -- a cluster of symptoms, which is what DSM uses -- and a disease, which has cause and effect relationships.

https://www.wired.com/2013/05/a-case-that-tells-the-weird-tale-of-dsm-and-other-recommended-reading/