Varicocele—This is an enlargement of the veins inside a testicle.
I started to get a bit more concerned about 2 weeks ago when the pain started almost immediately after starting to exercise.
Leading from the epididymis is the vas deferens.
I brushed it off initially, since it only happened once a month or so, and felt closer to gas pains, even though even back then I noticed that my testicles would be very sensitive when the pain was occurring.
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What causes germ cells to become abnormal and develop into cancer isn't known.