You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is 40-year-old men are suffering from fever & pain in the scrotum which is not relieved by elevation of the testis. 3 days before had sexual contact with a young female - and explain in detail?
Torsion of testis can be differentiated from acute epididymitis by Prehn's sign. ie

On the elevation of testis the pain increases in → Torsion
On the elevation of the testis, the pain decreases in → epididymoorchitis.
Don’t be confused with fever, it can also occur in torsion, especially in older patients.