Varicose veins of penis can be caused by physiological and pathological reasons, such as inflammation of blood vessels, tumor compression and so on. 1. Physiological reasons: the penis is rich in blood vessels, which can be seen with naked eyes. When the penis is erected, the blood vessels will fill up rapidly and form varicose veins, which are easy to reach. When the penis is erect, the blood vessels will fill up quickly and form varicose veins, which are easy to reach. These varicose veins will collapse under the state of weakness, which is generally a normal physiological phenomenon. 2. Pathologic causes: (1) Inflammation of blood vessels: some patients may suffer from vascular inflammation, which leads to obstruction of the diastolic function of the veins, resulting in blood retention, and thus varicose veins of the penis occur. (2) Tumor compression: some patients may suffer from penile varicose veins due to tumor compression, which leads to the obstruction of blood return to the local penile veins, thus resulting in penile varicose veins. There are many other reasons that can lead to the occurrence of penile varicose veins, it is recommended that such patients go to regular hospitals, cooperate with the doctor to complete the relevant examinations, identify the causes and actively deal with them.