Common factors causing male infertility are the following ten, male friends can self-check their own which belongs to? 1, testicular abnormality: testicular abnormality has three kinds of cases: ① cryptorchidism, not only lead to infertility, but also can induce malignant changes; ② fetal period due to unfavorable environmental factors damage to the embryonic base; ③ early testicular injury, can be caused by birth injury in the process of delivery. Chromosomal abnormality: such as hermaphroditic malformation, reproductive organ hair improvement abnormality, and so on. 3, testicular injury: such as hernia repair, syringomyelia surgery, testicular fixation surgery, etc. damage to the testicular blood vessels, impede the blood supply and make testicular atrophy. 4.Synovial effusion: sheath effusion compresses the blood circulation of testis, which can lead to testicular infection or atrophy. The incidence of the disease after puberty is 16%-19%. 5, gravity effect: men in excessive weight bearing, can make testicular spermatogenesis reduced and lead to sterility. 6, mental factors: excessive tension, mostly due to erectile dysfunction and sterility. 7, blood supply disorders: atherosclerosis patients and diabetic patients, often accompanied by small testicular artery disease, so that the ability to produce sperm decline and cause sterility. 8, drugs and medications: such as nicotine, alcohol, opium and other excessive, can affect the sperm production. Antiepileptic drugs have a direct effect on spermatogenesis. 9, the environmental impact: pit miners, boilers, etc. overheating; underwear too tight; excessive smoking and drinking; hypoxia, can affect fertility. 10, reproductive organs infections: bacteria, viruses, protozoa and other infections, can directly damage the testicles, seriously affecting spermatogenesis and reduce sperm activity and lead to infertility. For example, 20% of the cases of mumps in the pre-adolescent stage of development are complicated by orchitis and cause infertility.