Many have come to assume that poltergeist activity is caused by a young woman who is near to having, or had recently had her first menstruation. They claim that the young woman is unaware she is causing the activity and that it is based on psychokinesis.
Hogwash! Poltergeist activity is caused by ghosts! Specifically, one recent, very strong apparition, or several ghosts at once. For the young woman hypothesis to be true, every single recorded poltergeist incident must be in a home occupied by a young woman. There are several cases where there was no girl living in or near the area of activity.
Some paranormal investigators who stumble upon a haunted location that is wrought with crashing objects and sliding furniture -- the kind of activity assigned to "poltergeists" -- correctly presume it is just a noisy ghost if there is no young woman present. But it is the same activity! The same investigator would blame the activity on a young woman were one living there, "typical poltergeist activity", they would say.
Hogwash! Hogwash! We walk through a world infested with ghosts. They are everywhere and cause all bad things to happen. They make you cut your chin as you shave; they make you yell at your daughter; they make the toast burn in the toaster; they bring Nurse Edna to me again and again; and they make your wife initiate an affair with a young man. Ghosts are our enemy.