Priapism may also develop spontaneously at a later period, and is then due to central irritation from extravasation into the substance of the cord, or to some reflex cause.

It may also occur from simple concussion, as shown by a case reported by Le Gros Clark.

Pressure on the cerebellum is supposed to account for cases of priapism observed in executions and suicides by hanging.

There is an instance recorded of an Italian "castrate" who said he provoked sexual pleasure by partially hanging himself.

He accidentally ended his life in pursuance of this peculiar habit.