Thigh root pain after erection may be caused by varicose veins of the spermatic cord, or it may be caused by the patient’s soft tissue injury and other reasons. 1. Varicose veins of the spermatic cord: refers to the spermatic cord trailing vascular plexus due to various causes of blood stagnation, resulting in local venous expansion, tortuous. Patients see the appearance of scrotal heaviness, scrotal cramps, hidden pain, sometimes radiating pain to the inner thigh root and perineum. 2. Trauma: may be due to collision, blows and other causes of trauma, wound nerve irritation, which can make the thigh root appear red, swollen and painful phenomenon. In addition, there are many other reasons that can cause pain in the thigh root after erection, such as short tethered belt and so on. It is recommended that patients with thigh pain after erection go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying the condition.