A normal ultrasound of the scrotum can be caused by chronic prostatitis, ureteral stones and varicocele. 1. chronic prostatitis: such patients in addition to frequent urination, urinary urgency and urinary difficulties, there may also be radiating pain, when the pain along the vas deferens to the scrotum and testicles, may also cause hidden pain in the scrotum but ultrasound normal phenomenon. 2. Ureteral stones: If there are stones at the end of the ureter, it will usually cause irritation, and the pain and other discomforts will also radiate to the testicles, resulting in scrotal pain with normal color ultrasound. 3. Varicose veins: It may also be caused by the symptoms of varicose veins, which may appear normal in the ultrasound, but if the patient has too much activity, the phenomenon of reflux of the spermatic veins may occur, which leads to scrotal pain and other symptoms. Therefore, it is recommended that patients go to the hospital for further examination to clarify the cause of the disease and treat it as soon as possible.