Which of the following is a symptom of testicular torsion?

The symptom of sudden severe pain in the scrotum is characteristic of testicular torsion. This condition occurs when the spermatic cord becomes twisted, cutting off the blood supply to the testicle, which leads to intense and sudden pain. The affected individual may also experience swelling, nausea, and vomiting as a result of the acute pain. Recognizing this symptom is crucial for timely medical intervention, as testicular torsion is a surgical emergency that requires prompt treatment to prevent loss of the testicle due to necrosis from lack of blood flow.

The other options, while they may pertain to various health issues, do not relate to testicular torsion. For instance, an itchy rash on the skin could indicate an allergic reaction or dermatological issue, frequent urination is typically associated with urinary tract infections or other urinary conditions, and a sore throat is commonly linked to viral infections or strep throat. None of these symptoms align with the acute presentation of testicular torsion, which reinforces the distinction of sudden severe scrotal pain as a key indicator.