is a persistent, usually painful, erection that lasts for more than four hours and occurs without sexual stimulation. The condition develops when blood in the penis becomes trapped and unable to drain. If the condition is not treated immediately, it can lead to scarring and permanent erectile dysfunction.
It can occur in all age groups, including newborns. However, it usually affects men between the ages of 5 to 10 years and 20 to 50 years.