What is Epididymal Hypertension? Epididymal hypertension, or “blue balls” refers to testicular aching that occurs when the blood in the male’s genitals is retained after prolonged sexual arousal and is not dissipated by an orgasm. What Causes Epididymal Hypertension? When a man becomes sexually aroused, the arteries that carry blood to his genitals enlarge, while the…