[Dex]

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before i went to bed yesterday, my testical was mildly to moderately aching. it's still aching 12 hours later.

do i have testicular cancer or something?

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I had a testicular torsion (twisted testicle) when I was 10 or 11 years old. There are supposed to be some ligaments or something to keep your testicles from rotating too far, but sometimes, for whatever reason, those fail. If this happens, your testicle can rotate too far and the blood supply to it (as well as the tubes leading from it) can be pinched shut as they become twisted. When this happened to me, my testicle swelled to about twice its size and I had a constant low stomach pain like you get when you have just been kicked in the nuts. This is nothing to fool with. If this is what you have, and it's not corrected soon enough, you may lose your testicle. When I had it, I was in such pain that there was no question about going to the doctor, so I have a feeling that this is probably not what you have, but it's better to be safe than sorry. (I've heard of some people having it where it wasn't as painful as mine was. Perhaps, sometimes, the blood supply isn't completely cut off or something?)

The other big possibility that comes to mind is epididymitis (inflammation of the epididymis). I've never had this but I've heard it can get pretty painful if not taken care of.

Does anything feel either swollen or out of place?

In any case, don't screw around. See a doctor.