Fan is always running loudly on Macbook Pro

I've had my Macbook Pro for just over three years now, and I haven't had a problem with the fan before now. A month or so ago I started noticing the fan was always on a constant hum, not so much that it was a problem, but just present. I figured I was just doing too much with it, even though I don't use much other than word, safari, and iTunes. Over the last couple weeks, however, I've noticed the hum just getting louder constantly. I've tried restarting the computer several times, and I can usually go about 10 minutes after that without the fan being loud, sometimes less if I try to play a video.
At this point there are times when it literally sounds like there's a motorcycle in my laptop, and I can feel a vibration when I type. However, I got a monitoring app and it says the temperature and fan speed are both at a normal temperature. I'm not sure what this means for my laptop, and I really want to fix this problem.
Any thoughts?

First try a SMC reset:
http://support.apple.com/kb/ht3964
If there is no change, open the MBP and look inside. Your MBP may very well have dirt and debris that needs to be cleaned out.
If that is not the case, run an Apple Hardware Test:
http://support.apple.com/kb/ht1509
Note that an error free AHT is NOT definitive.
The last resort is an appointment at an Apple store genius bar for a free evaluation.
Ciao.

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Fan is always running loudly on Macbook Pro

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