The causes of testicular swelling and pain are commonly the following: 1, inflammation, infection stimulation: urinary system inflammation or infection, may spread to the testicles through retrograde infection, such as prostatitis, inflammation stimulation induced orchitis or epididymitis, resulting in testicular swelling, pain performance, such patients are mostly accompanied by urinary system irritation symptoms, such as urinary frequency, urinary urgency, urinary pain, etc. 2, varicocele: varicocele may lead to pain in the small abdomen, pulling the perineum area, leading to pain in the scrotum and testicles. 3, trauma factors: injury to the scrotal area, resulting in damage to the testicles inside the scrotum, swelling, pain and other performance. 4, testicular syringomyelia: after testicular syringomyelia, there will be scrotal swelling, etc., a feeling of swelling of the scrotum and testicles, and after standing or walking for a long time, resulting in local pain, and after bed rest, the symptoms can be slightly relieved. In short, if there is testicular swelling and pain, it is still recommended to go to the urology department of a public hospital for a formal examination, the examination items are mainly scrotal and testicular ultrasound examination, and if necessary, semen examination is needed to clarify the cause of testicular swelling and pain, and then targeted treatment, and some diseases require surgical treatment.