Most common? Most likely depression or attention based disorders. Most common treatment? Evaluation of physical health factors, recommendation of increased exercise, change in diet, and social structure is usually the first step. If those challenges are daunting or already addressed, then medication management comes into play. If they can't confirm a specific deficit in your hormones, they usually start very low on the medication scale and then begin turning it up after seeing how the patient adjusts. Unless it's ADHD meds, in which case there's so much of a shortage they'll STILL tell you to try all the other things first at least one more time because they can't order you the pills anyway.

I'd back my argument up with a source or two if you wanted it, but it didn't seem like that was your vibe in the other comments. "Community based" approaches like getting people outside more, to see other people in person if they can so they can get some socialization, engaging them within their community so they can feel apart of something, those are all very good and awesome ideas that have legitimate backing from the scientific community to reduce the symptoms of the most commonly diagnosed disorders.

But you know what makes engaging in my local community easier? 5mg of D-Amphetamine for me, so I can keep my squirrel brain in check long enough to say going outside is my plan and that I want to tolerate hearing other people talk around me while I'm trying to think. For some, the added protection of an anti-depressant that stops them from reaching the same "basement" of emotion, keeping them baseline long enough to do their job, get the groceries, and sign a kid's report card until they've gotten themselves into a routine that doesn't lead to as many drops.

Sure, some things are societal, but a very good portion of it is chemical and denying it would be silly. Now, WHY there is a rising number of diagnoses compared to previous generations? My first assumption is stigma, more people are just being honest or feeling more comfortable sharing. But there's also the factor of microplastics, pollution factors, unregulated food industry, etc. that play a large role.