Fan runs almost constantly-why?

So my macbook is about 2.5 years old, going on 3. I will admit that I don’t turn off my computer that much. I just close it for the night. However, my fan is been going kind of crazy for a while now. It’s okay for the first little bit it’s open, but then if I open certain websites or watch videos my fan goes at full speed and then won’t stop.
Is there anything I can do? Or do I need to take it to an Apple store?
thanks.

https://discussions.apple.com/message/15022489#15022489
Another thing to do is to open activity monitor and sort the items by the amount of cpu that they use. If an application is using too much, you can quit it. If it only runs when you use safari, reset it.

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Hello, let's see some temps & fan speeds please.
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/

Fan runs almost constantly-why?

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