It depends on a lot of factors, and can be complicated. Laptops tend to have really poor air flow, and it could be overheating when you bump up the settings. A laptop cooler (cooling stand/pad) might help if this is the case. You can pick one up for maybe $10. Or it could be any other number of other things. Best I can give with the little information you've given.
tl;dr: Laptop really hot? Get a cooling stand/pad (pref. with fans).