Testicular pain in nine-year-old children is mostly considered to be related to trauma, acute and chronic genital lesions and radiating pain caused by other diseases. 1. Trauma: when nine-year-old children’s testicles are subjected to extrusion, impact and other external forces, it can cause damage to the testicles, thus causing the symptoms of testicular pain. 2. Acute genital lesions: such as testicular torsion, acute orchitis and other acute lesions of the testicles can cause testicular injury, resulting in testicular pain and sudden pain in children. 3. Chronic genital lesions: such as testicular tumors, testicular syringomyelia, varicocele and other chronic lesions, which can produce long-term repeated stimulation of the testicles, and gradually cause a certain degree of testicular damage, causing testicular pain and other symptoms. 4. Radiation pain of other diseases: pain caused by diseases such as ureteral stones may radiate to the testicles, thus causing radiating pain in the testicles. Nine-year-old children with symptoms of testicular pain, it is recommended to seek timely medical attention to clarify the cause of the pain and then actively treat it, so as not to delay the condition.