Prolonged erectile testicular pain, possible causes: 1. Longer erection time, when gonadal secretion is more vigorous, but ejaculation or semen discharge has not occurred. Semen stagnation within the epididymis will result in swelling and thickening of the epididymis, which can also involve the testicles with a slight swelling sensation, accompanied by an obvious downward and painful sensation. When touching the testicles or epididymis, you can feel an increase in volume and thickening of the spermatic cord. If the sperm discharge occurs in time and the semen is no longer stagnant, this symptom can be gradually relieved, or stop the related sexual stimulation so that the gonadal secretion is reduced, so that the stagnant symptom will also be gradually relieved. 2. Patients suffering from varicocele will have prolonged erection which will lead to the aggravation of the varicocele, and then the spermatic vessels will accumulate in the scrotum, involving the testicles to produce a mild swelling feeling, accompanied by The swelling of the testicles is mild, with obvious swelling and pain. The thickened blood vessels can be felt in the scrotum by hand, and the size of the testicles can be felt to be slightly enlarged, accompanied by a significant swelling and pain.