13" macbook fan won't stop

Im running 10.7.5 on a 2.16GHz Core 2 Duo 13" MacBook.  Sometimes, the fan will not stop spinning.  It'll increase and decrease speed, but when it gets going, it usually runs full tilt.  The only things running are Safari, iTunes and mail.  What could be causing this? 

Hi Jorge A. Narvaez!
I have two articles for you that may help enlighten you a little about the fans on your MacBook:
Learn about the fans in your Mac
http://support.apple.com/kb/ht4543
Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity
http://support.apple.com/kb/TS1473
Take care, and thanks for visiting the Apple Support Communities.
Cheers,
Braden

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