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I have a hard vein/tube under epididymis, connecting it to my testicle. If it gets pulled or pushed the wrong way it can be painful. Is it normal to have a harder tube tube? I'm not sure if I was too rough on my teste self check and made it swell up. I can feel the same thing on both testicles but only my right one has it harder.

Also what is the average size difference in testicles?


I would suggest that you go to a doctor, because this can be varicocele vein. This is abnormal growth of the vein in your testicles that can make you infertile. Usually they can be seen from outside, but sometimes they can be inside your scrotum and doctor needs to ultrasound it in order to diagnose it.