The main causes of male infertility are testicular insufficiency due to congenital and acquired causes, obstructions of the male genital tract, genetic and endocrine abnormalities, urogenital infections and varicoceles. Also lifestyle can have a negative influence on semen quality: Smoking, obesity, drugs and anabolic steroids influence sperm parameters and may reduce natural conception. Some chronic diseases have a negative influence on fertility. Cancer treatment can cause permanent damage to spermatogenesis.

Causes of male infertility, Genetic abnormalities, Male factors, Male infertility, Obstructions, Testicular insufficiency, Urogenital infections, Varicocele,
Department of Urology

Dohle, G.R. (2015). Male factors in couple’s infertility. doi:10.1007/978-3-662-45018-5_12