As regards the causes of epilepsy, Ibn Taymiyah explained (in Majmoo’ al-Fataawa, 19/39) the causes. He said: “When the jinn touch a person with epilepsy, it may be because of desire or love, just as happens between one human and another… or it may – as is usually the case – be because of hatred and punishment,
such as when a person has harmed them or they think that he has harmed them deliberately, either by urinating on them or pouring hot water on them or killing them, even if the person did that unknowingly. There are ignorant and wrongdoing ones among the jinn who may punish a person more than he deserves, or they may be playing with him and mistreating him, like foolish people among mankind.”
http://www.islam-qa.com/en/ref/1819
