The common causes of testicular and abdominal pain include epididymitis, testicular torsion, varicocele, etc. It is necessary to go to the hospital in time to find out the cause of the disease and treat it actively. 1. Epididymitis: Epididymitis is a common disease of male reproductive system, the epididymis is located in the scrotum, when the epididymis is inflamed, it will cause pain and swelling of the epididymis, scrotum enlargement accompanied by a feeling of swelling, the epididymis will become bigger and harder and hardness will appear, etc. And the inflammation of the epididymis will cause pain and swelling of the epididymis. Moreover, the pain caused by inflammation of epididymitis is radioactive and often causes abdominal swelling and pain. 2. Testicular torsion: Testicular torsion refers to the disease caused by the spermatic cord torsion which affects the blood supply. At first, the pain is mainly confined to the scrotum, and then it will gradually develop to the perineum, and the main clinical symptoms of patients are the painful enlargement of one side of testis, and the radiating pain in the abdomen and groin. 3. Varicocele: Varicocele refers to the tortuous and dilated veins of the spermatic cord, and the main symptom is pain and swelling of the scrotum. Since the spermatic cord is connected to the abdomen, patients often show pain and discomfort in the testicles and abdomen. There are many reasons for testicular pain connected to the abdomen, such as orchitis, testicular trauma, etc. You should go to the hospital immediately.