What to ask a doctor to check?

[mattg817]

I'm 20 and my hair has started to thin slowly over the past few years. Recently I decided to get on Propecia to do something about it before it becomes too noticable. I am going to the doctor for a physical soon, and I just wanted to rule out any other causes of hair loss, so what should I ask him to check? When I talked to my dermatologist about propecia I also asked him about whether my seb derm could be causing it, but he told me that I had mine well under control and it would only exacerbate it if i let it get out of control. basically I just want to rule out anything else.