My mac made a heating noise, what does that mean?

I woke up this morning to my macbook pro making this loud heating noise, like an exhaust fan. What does that mean?

More Information on your Mac would be great, thats kind of vague.
But Macbook Pro's do have a (all i can really speak of) exhaust on the back right where the screan attaches to the body of the mac, and some times when running certain processor intense programs like games, or Photo / Movie editing programs will make this turn on, and yes it can be loud and anoying, but its nothing really to worry about.
Hope this helps you.

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