Infertility can be considered a possibility if you have regular sexual intercourse for more than 1 year after marriage, without any contraception, and you fail to have children. About 8% of couples of childbearing age worldwide suffer from infertility. Male infertility refers to couples who have lived together for more than one year without using contraception and have not had any children. The test is normal for the woman and abnormal for the man. Why do men become infertile? Any factor that affects and impairs the structure and function of the male reproductive system can cause male fertility to become impaired and lead to infertility. There are many factors that affect male infertility, such as congenital developmental malformations and pathological changes in reproductive organ bodies and physiological functions, abnormalities in endocrine, genetic, and immune aspects, mechanical damage and damage from physicochemical factors, infections from various microorganisms, and disorders in mental and psychological states can all lead to male infertility. The causes of male infertility are complex, and therefore their classification is also complex. There are classifications from the etiological point of view, from the diagnostic point of view, and from the therapeutic point of view. A relatively new classification is the logical classification of male infertility proposed by an Australian male specialist. The logical classification of male infertility takes into account the experience of physicians and avoids the shortcomings of a classification based solely on semen analysis parameters and is easier to understand. We classify male infertility into three types: pre-testicular, testicular and post-testicular, centering on the testes, the organ of spermatozoa, the most central substance of fertility. Pre-testicular factors mainly refer to endocrine factors, neurological, vascular and psychological factors affecting the process of sexual intercourse, such as sexual intercourse disorders, ejaculation disorders and other links leading to infertility. Testicular factors mainly refer to lesions of the testes themselves: such as hereditary Creutzfeldt-Jakob syndrome, Y chromosome deletion, ciliary brake syndrome, etc.; congenital cryptorchidism; testicular inflammation due to infectious factors; anti-spermatogenic factors, high temperature, chemotherapy, drugs, radiation, etc.; vascular factors such as testicular torsion, varicocele, etc.; and immunological and idiopathic (unexplained) factors. Fertility is a complex and coordinated process whose etiology is so complicated that doctors can classify male infertility according to different classification criteria, and patients may arrive at different diagnoses when they make multiple medical comparisons.