"They believed that amok was caused by the hantu belian, which was an evil tiger spirit that entered one’s body and caused the heinous act" [ibid]
Of course, the very word "hysteria" has its origin in the Greek for "uterus", and in ancient times the belief was that the womb was responsible for a number of female behaviors. It progressed to include demonic forces:
"Through the Middle Ages another cause of dramatic symptoms could be found: demonic possession. It was thought that demoniacal forces were attracted to those who were prone to melancholy, particularly single women and the elderly"