Priapism is a persistent and often painful erection that lasts for several hours and occurs without sexual stimulation. It is a medical emergency and requires prompt treatment as it can lead to permanent erectile dysfunction if left untreated. Priapism is classified into two types: ischemic priapism and non-ischemic priapism. Ischemic priapism occurs when blood is unable to leave the penis and causes tissue damage, while non-ischemic priapism occurs due to an abnormality in the veins or an underlying medical condition. Treatment for priapism may involve draining blood from the penis, medications to decrease blood flow, or surgical intervention in severe cases. The underlying cause of the priapism should also be addressed.