The common causes of testicular pain in children are as follows: I. Inflammation, orchitis is a common cause of testicular pain. There are very many causes of orchitis, commonly seen in patients with mumps, which can be complicated by orchitis, mostly unilateral, with painful and enlarged testicles. The testicular torsion is one of the common emergencies in the scrotum, which may occur from newborn to 70 years old. 65% occurs in children aged 12-19 years old, usually with strenuous activity or external force on the testicles a few hours before the onset. Sudden onset of severe testicular pain during sleep or quiet is the first symptom of the disease and one of its main diagnostic bases. Third, injury, testicular mobility in the scrotum is relatively large and tough white membrane, protecting the chance of closed injury is small, testicular injury is mostly related to the exposure to violence and car accidents.