Varicocele refers to the dilatation of veins of the scrotum that may cause discomfort, heaviness, pain, and testicular atrophy. In extreme cases, it may cause infertility. It may be an asymptomatic condition in some males and usually affects the left testicle than the right. This is because the affected veins of the scrotum are generally located on the left side. Sometimes, it may affect both testicles. These veins are similar to the varicose veins of the legs.