What would be the other symptoms
System boot issues, data corruption of various types, a ticking noise from the read / write heads (although if you hear that, then you've probably got bigger problems).
You may just have some dust bunnies, bothering the system fan. Sometimes a shot of compressed air, in and around the vent areas can help, although often the ventilation pathways are somewhat restricted (to anything but air), a shot of air might force any critters deeper into the system, exacerbating the problem.
If the system is not running hot while idle or under load, nor exhibiting any other symptoms in the way of performance, then I wouldn't panic.
As long as you can feel warm air being expelled from the laptop, then you're probably good for now. IF the noise stops and you no longer feel any air movement then, you have cause for concern.
There are some freeware programs like CoreTemp and HWiNFO out there that will allow you to keep an eye on your system temps, and......
If you discover that the system is running a little hotter than you expect you might want to pick up an auxiliary cooling pad to augment the system fan.
Link Removed