Olaiya list causes of mental illness. saying several issues can result to mental illness. He says one can go mad, if one offend an elder and he/she curses you, you can go mad. In one’s family, if they are fighting over something, say a piece of land or a house, they can make one mad. Also If they see one’s bright future in the family, envious people can make one mad. So real madness can also be caused by high fever, or maybe one is sick, it can also turn to madness.