Priapism is “the presence of a persistent, involuntary erection that is independent of sexual desire or stimulation.” Three forms are known: high-flow, low-flow, and recurrent. High-flow priapism usually develops as a result of injury, and its essence is that arterial blood flows continuously at high pressure in the cavernous bodies of the penis. The low-flow and recurrent forms involve the obstruction of the venous outflow of the cavernous bodies, which can lead to the death of the penis. That is why emergency care is often required. Early recognition is very important, as timely treatment completely eliminates the symptoms. Since the disease is uncommon, it is especially important to consult a specialist experienced in therapy. Delayed or improperly applied treatment can lead to complete loss of erection.