Fever is a result of an immune response from our body caused by some body invaders like fungi,bacteria, viruses and other invaders that would result us from having a fever.
They say that fever is a normal response of our immune system. Though it is a normal response of our immune system but still we shouldn't ignore it because it may result to a high fever that would make us weak. Some of the person who has fever may loss their appetite and don't want to eat at all.
So in order to treat fever we should take some medicines like ibuprofen, naproxin, aspirin and others that would heal our fever.