A mass inside the scrotum. If a varicocele is huge more than enough, a mass like a "bag of worms" may be obvious previously mentioned the testicle. A more compact varicocele could be much too little to determine but obvious by touch. So in many ways, it is a cycle. https://www.sgvascularctr.com/what-are-veins-and-why-should-i-know-about-them/