Testicular torsion is not uncommon clinically, and it is very easy to be misdiagnosed as acute testicular epididymitis or other diseases when first diagnosed. Untimely diagnosis often leads to testicular necrosis or irreversible testicular atrophy and removal, which in turn causes greater physical and psychological impact on the patient, so early diagnosis and timely surgery is the key. Among the scrotal emergencies in which scrotal swelling and testicular pain are the main complaints, testicular torsion should be highly suspected if the following points occur: 1. Adolescent scrotal emergencies, testicular torsion can occur at any age, but it is more common in adolescents. According to the literature, the incidence of adolescent development in all testicular torsion accounted for 65%; 2, sleep or after strenuous activity, sleep or quiet sudden onset of severe testicular pain is one of the important diagnostic basis for testicular torsion, domestic reports 60% to 70% occurred during sleep, especially at midnight; 3, strenuous physical labor, sex, cold is also a trigger for testicular torsion; 4, previous brief The pain disappears as soon as the testicle is twisted and reset; 5, the testicle is displaced upward or in a transverse position, due to the spasm of the levator muscle lifting the testicle and the twisting of the spermatic cord rotating the testicle, holding up the scrotum, the pain does not decrease but increases; 6, the levator muscle reflex disappears; 7, color Doppler ultrasonography, the results suggest that the affected testicle is enlarged, uneven echogenicity, blood flow is reduced or disappeared (pay special attention to In individual cases, blood flow is abundant!) The testicular torsion was found to be a very serious problem. Ultrasound has a positive diagnostic value for testicular torsion and has become a routine adjunct to emergency scrotal examinations due to its high sensitivity, visualization and non-invasiveness. We believe that ultrasound should be performed in all patients with scrotal emergencies whenever possible.