Many male patients experience pain in the testicles after ejaculation. There are the following reasons for pain in the testicles after ejaculation: first, too frequent sex, pain during ejaculation is mostly caused by too frequent sex, too frequent sex can lead to repeated congestion of the prostate gland, causing sterile inflammation of the prostate gland, thus making these organs edematous, and the smooth muscles contract strongly during ejaculation, stimulating the congested and edematous organs, thus leading to pain; second, Infection of the reproductive system, such as when suffering from urethritis or prostatitis, bacteria in the urethra can retrograde to the genital tract, causing inflammation of the testicles or epididymis, which can stimulate the testicles to contract during ejaculation and cause pain; third, varicose veins of the spermatic cord can also cause testicular pain after ejaculation, the most common cause for male patients, it is best to go to the hospital for ultrasound examination, if the symptoms are caused by varicose veins of the spermatic cord, surgical treatment is required.