A medical condition that occurs when the penis remains erect for an extended period of time without any stimulation. If left untreated, this can result in serious damage.

Some types of erection rings (cock rings) can cause a priapism if used for more than the recommended time frame of 20 to 30 minutes. Certain medications and diseases can also cause persistent erections. Men should seek emergency medical assistance if an erection lasts for more than a few hours.