My friend's 20-ish-year-old son has thyroid problems, and so does she. I admit I was surprised when she mentioned it (it seems to be a middle-aged woman thing). I was diagnosed last year as hypothyroid and the more I learn, the more I think everyone should get tested.

I don't know what your son's future plans are, but being treated for depression can interfere with some career dreams. I wouldn't be able to keep my medical certificate if I were being treated (pharmaceutically) for depression. I'm not saying don't get treated if it's needed, just that if something else may be involved, it's worth looking into. Good luck!