@Shane ******
I made an appointment online to see a specialist for a bunion. I got a confirmation e-mail which I printed out, and that was all I needed. No long-term medical treatment, etc.
I plan to travel fairly frequently, so I'll be out of Thailand prior to the 6 months and from what I understand that should restart the visa for another 6 months when I return. I seriously doubt that the information provided in the application process is part of your visa record, so immigration should not be asking if you're coming back in for the same reason. However, I do not know this for a fact...