The possible clinical causes of sperm duct pain in men include vas deferens injury, vasculitis, and so on. 1. Vas deferens injury: this condition mostly refers to the state of vas deferens integrity and continuity being destroyed by external force, with clinical manifestations such as cloudy semen and pain in the scrotum area. This kind of disease is relatively rare, and is commonly seen in medical injury. 2. Vasculitis: when the body is infected, the vas deferens may be attacked by germs transmitted through the bloodstream, thus triggering an inflammatory reaction in the area, which is clinically manifested as redness and swelling of the skin in the scrotum area, ejaculation pain, body fever, generalized fatigue, and so on. The people who have sex too often, the prostate is in a state of excitement for a long time or the action is relatively rough, may cause the vas deferens to appear non-infectious inflammatory reaction, clinical manifestations of ejaculation pain, urinary pain, urinary urgency, and so on. It is recommended that men with vas deferens pain should go to the male department of the hospital, reproductive medicine department and other departments for relevant examination and treatment.