ConquerI can play nearly all games without the fan working a bit but minecraft just works it. EG: Halo works without need for a fan.
Its normal.. Minecraft takes a lot more powerfull processor to run... Because it has to generate all the single chunks.. Theres no way really to stop this... But what you can do is try to clean your computer. Open it up and clean all the dust. That cause a lot of problem with overeathing. You can also put a home fan (if i can call it like that XD) next to your computer.... Thats what i did with my old laptop XD . It worked fine