I also have it in the left testicle. You’d likely know you have it if the veins leading to it are noticeably bigger on the side with it, and would feel like a “sack of worms” as the doctor I saw as a kid so eloquently called it. Earlier in the year I was tested for low testosterone, even though I’m 32. I got it tested at like 3pm and it came back at 248, which is like what a 90 year old would have. I was then sent to a endocrinologist who had me retest it at 8am, and also wanted to check my prolactin levels. Well my testosterone came back at like 470, which is better, but still like that of a 60 year old, but my prolactin was higher than the normal ranges. I was put on medicine for 2 months, and retested both, and my testosterone went up to like 650+, which is where it should be for my age, and my prolactin was almost 0, which for a guy is fine, since it is used in the production of breast milk.
I know that varicocele can affect testosterone and fertility, but I don’t think I’ll have kids, so that aspect doesn’t really concern me. But having increased testosterone, and no pain or aches does interest me, which is why I am seeing a urologist to get it fixed.