Hi CT!
I have only gone through 2 checks, but from my experience, they are not looking for what is wrong with you, but if you are healthy enough to be a commercial pilot. My JAR medical is more stressful then the one here. I would not say, they don't check anything, but they don't go too deeply into unnecessary stuff. I am a bit too big to be called normal, but as long as you are fit, they say "Captain, you are too big, lose weight" :-) My last medical started at 0730, I was on my way home at 0815, and they checked everything like they do it home. As you can see, the medical is not part of the selection, you do it during your initial training. That says a lot about it.
73d