Our expert says:
Pain in the back and in the testis can be caused by various things, one could be a small kidney stone. If the testis is not red, swollen or sore when you touch it, it is probably not an infection. A rare cause of testis pain is when it twists on itself - this is usually very painful, you can also be nauseous and this needs urgent treatment to untwist the testis as it can cut off the blood supply.
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