Unless you’ve recently experienced irritation or trauma to the penis, erections should not be painful. If they are, you should see a doctor as soon as possible. According to NetWellness.org, the leading causes of erectile pain are the following:
Peyronie’s Disease: Characterized by a lump or plaque that forms on the penis, Peyronie’s can cause painful erections but can be treated.
Penile Mass: Any abnormal growth or lump on the penis should be thoroughly investigated and evaluated by ultrasound or biopsy if indicated.
Priapism: A prolonged erection — lasting more than four hours — is not only painful but also can cause scarring of erectile tissues if left untreated.
Phimosis: This condition involves a tightness of the foreskin that prevents it from retracting over the head of the penis upon erection. This can be a congenital condition or a symptom of infection.
Penile injury: This covers a wide range of possible damage to the penis itself and the blood vessels and nerves that serve it. Seek medical attention immediately if you suffer from such a trauma.