Epididymitis has a lot of symptoms that overlap with testicular torsion, and the doctor may want to rule this out as a possibility. Testicular torsion is a medical emergency that occurs when the testicle twists, cutting off blood flow and eventually leading to necrosis.
This condition can be reversed if treated within eight hours, which is why many doctors will rule it out as a cause for epididymitis symptoms. Again, many of the symptoms overlap, but symptoms of epididymitis tend to come on slowly, while signs of torsion are generally more sudden.

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