Blockage from the vas deferens is one in the main reasons for male infertility. However, male vas deferens will often have no obvious external symptoms, and what are the reasons for this? Let me expose you to these. Insufficiency in the nature for example the absence from the head, body, and tail from the epididymis, a partial or complete absence in the vas deferens, vas deferens and epididymis usually are not connected, epididymis, vas deferens or seminal vesicle hypoplasia. Reproductive system tumors including epididymal tumors, seminal vesicle tumors, prostate tumors causing oppression, producing lumens, etc., may cause blockage of the vas deferens. Reproductive system damage such as varicocele, vas deferens injury after spermatic cord tumor, hernia repair, epididymal semen cyst, testicular sperm choroidal effusion surgery, can damage the epididymis; prostate surgery may cause ejaculation orifice occlusion, or There was no damage during the operation, but the scar still existed behind following the operation, so your vas deferens was compressed or perhaps deformed. Bacterial virus infection Due to the invasion of some bacteria, for instance, Mycobacterium tuberculosis infects the reproductive system, which damages the seminiferous tubules and vas deferens from the epididymis, changes the composition with the seminal plasma, to cause blockage from the vas deferens. Inflammatory infections, inflammatory infections caused by tract inflammation also can lead to infection in the vas deferens, block the vas deferens, damage sperm, and cause men's infertility.