Macbook fans running from start up

My Macbook is about 5 months old and I noticed that since a few weeks ago, when I turn the Mac on, the fans start to run. But the Macbook is not even hot or doing something heavy, like exporting from iMovie. The sound is not loud at all. I downloaded a Dashboard widget about fans and it says the fans are running at "18-20" speed. I'm not sure it has affected the battery life, but it must have.

Hi.....you might want to open Activity Monitor (Utilities folder)....from the first window choose (CPU)....from the top of that window click on the drop down menu and choose (All Processes)...look for a process using double or even triple digit CPU%.....if something is stuck/hung you can quit the process from there...
You might also want to try an SMC reset....
http://support.apple.com/kb/HT3964

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