Priapism

An abnormally prolonged and often painful penile erection lasting ≥4 hours and unrelated to sexual stimulation, due to dysregulated cavernosal blood flow. Possbile causes are hematologic disease (sickle cell disease, leukemia, thalassemia), medication side effects (trazodone, antipsychotics, warfarin, cocaine, cannabis, amphetamine), physical trauma, pelvic tumor, carbon monoxide poisoning, or spider bite from the Brazilian wandering spider.