I have a 15 inch Mac Book Pro and recently it has started to run louder than normal?

For about a month now my Macbook Pro has been running louder than usual, and its hot to the touch. As far as programs running, I'm usually just doing basic things such as using the internet or on Microsoft Word. Is there any reason why this might of just started occuring?

If you think the noise is caused by your fan, check out the following KB Article:  http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC)
Hard drive noise, check out the following:  Failing Hard Drive Sounds
How to Tell When Your Hard Drive is Going to Fail
Heat
According to the user manual it states in part:
"Do not operate your MacBook Pro on a pillow or other soft material, as the material can block the airflow vents. Never place anything over the keyboard when operating your MacBook Pro. Never push objects into the ventilation openings."
MacBook Pro: Care, Use, and Safety Information
"Do not place your MacBook Pro on your lap or other body surface for extended periods of time. Prolonged body contact can cause discomfort and potentially a burn."

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