Oligospermia is one of the important factors causing male infertility. Oligospermia not only brings great disturbance to the physical and mental health of many male friends, but also affects male fertility and family harmony. The amount of semen discharged by a normal male each time he ejaculates is generally 2-6 ml, so as to achieve normal fertility. While patients with oligospermia often have less than 2 ml of semen when they have intercourse and ejaculate, the quality and quantity of natural sperm will be affected, which leads to low male fertility. So what exactly are the factors that can lead to the occurrence of oligospermia in men? Here is a summary of the following reasons that may lead to men suffering from spermatozoa: a, inflammatory factors: prostatitis or seminal vesicle inflammation, will cause a reduction in glandular secretion and blockage of the glandular ducts, which in turn causes the amount of sperm discharge less; two, vas deferens blockage: sperm transport channel obstruction, congenital vas deficiency such as, vas deferens trauma, ligation, gonorrheal epididymitis, epididymal prostate tuberculosis and caseous necrosis can lead to Spermatozoa production disorders: causes include congenital malformations such as orchid deformities, cryptorchidism, testicular hypoplasia; testicular atrophy due to testicular trauma, vas deferens artery trauma, testicular torsion, mumps combined with orchitis; varicocele: varicocele increases the local temperature of the testes and vasoactive substances, thus affecting the spermatogenic function of the testes; v. Autoimmune: reproductive immunology studies have shown that the spermatozoa of the testes can be affected by the presence of a vas deferens. , autoimmunity: reproductive immunology research found that male autoimmunity can affect fertility, and anti-sperm antibodies can affect sperm production and delivery. Men should find their own problems as early as possible, the right treatment, but also their own a healthy life.