不孕不育的影响因素英文作文 Influencing factors: 1.It affects testicular function and leads to spermatogenesis disorder, such as cryptorchidism, Klinefelter syndrome, pituitary tumor, varicocele, environmental factors, etc … Cryptorchidism, or testicular hypoplasia, is a common cause of male infertility. It can be manifested as azoospermia, oligospermia and oligospermia, which leads to infertility. The cryptorchidism testicles located in the abdomen are prone to canceration and should be highly valued. Varicocele mostly occurs in adolescence and young adults, and the incidence rate is 10-15%, which can reach 40% in infertile men, among which secondary infertility is 70-80%. Environmental factors: chemical toxic substances affecting testis: metals, pesticides, organic compounds, drugs; Physical factors affecting testis: heat, microwave, infrared ray and radiation. Lifestyle: clothes, such as tights; Food, such as bad hobbies, tobacco and alcohol; Bad activities such as sauna. 2. Other causes of male infertility include: Vas deferens obstruction Male genital infection Immune factors such as infertility. 本文来源：https://www.wddqw.com/doc/8373d473e75c3b3567ec102de2bd960590c6d904.html