Sound coming from the MBP

Hey guys I was just wondering, I'm hearing a little high-pitched but very faint sound coming from the lower left corner of my MBP. I was just wondering if I should be worried about this??

I'm guessing it's the ever so popular whine "problem". If it becomes too annoying for you to handle, I would contact AppleCare if you have it. But if it is very faint as you say it is I would not be too worried.

Yea, it's not very loud, when I'm playing music I don't hear it well, but I can when I'm just sitting around surfing the net. I'll take care of it if it seems to get worse or anything, I just didn't know if it was a fan or something because up to this point my MBP has been DEAD silent, I haven't heard any fans or anything. It's pretty amazing!