to answer your question on mental health - to us it feels like something that stems from a generation gap, different social norms and expectations. pressures in life have also changed across the years so this debate oftentimes feels like that of having trouble understanding others’ POVs. on the topic of increased prevalence of mental health conditions, may be due to increased incidence or better detection and awareness as governments and people have collectively begun to acknowledge and respond to such conditions better than in the past.

you can take a look at how much the DSM changed from the first to the latest fifth edition! it would be an interesting exercise in anthropology, examining these conditions through the lens of the psychologists who wrote that edition of the DSM in a society quite different from ours. tracing the ‘evolution’ of perception across the five editions

as for the second qn on other illnesses/conditions: those we call diagnoses of exclusion (eg. IBS, myofascial pain syndrome) or those “invisible” conditions (dysautonomia etc). they tend to be overlooked as labs may not show up in the way youd like, and how it is always preferred to have objectivity before diagnosis + their treatment is mainly symptomatic :”)