According to the World Health Organization, male infertility is considered to be when a couple has had normal sexual intercourse for more than one year without using any contraceptive measures and the woman is infertile due to male factors. According to the guidelines for the diagnosis and treatment of male infertility, the main causes of reduced fertility in men include congenital and acquired genitourinary tract malformations, reproductive tract infections, varicocele, endocrine disorders, genetic defects and immune factors. It may seem obvious at a glance, but in a specific patient, the causes may be multifaceted and treatment is not easy. There are also unknown reasons, also called idiopathic infertility, refers to the application of existing means of examination of both spouses are not obvious abnormalities, but did not conceive a child; or, the examination is simply male semen quality is not very good, semen analysis shows that the spermatozoa, spermatozoa and deformed spermatozoa, but do not know what causes, known as “idiopathic semen abnormalities”. In 2002, a sample survey of six counties and cities in Guangdong Province found that the average incidence of infertility was 14.7%. A few decades ago, only 5 to 8 out of every 100 couples had infertility problems. In the past, people tended to point the finger at the woman as the reason for not being able to have children, but according to a survey conducted by the World Health Organization (WHO), 30% of infertility cases in couples were due to the man alone, while 20% were due to a combination of the two sexes. This means that the male factor accounts for half of the infertility. This is why our department emphasizes “co-education”. Men’s semen is changing Danish scholars compared the quality of men’s semen between 1940 and 1990 and found that the number of spermatozoa was decreasing dramatically. In 1940, the number of sperm in each milliliter of male semen was 113 million, and by the 1990s, there were only 66 million left, a reduction of about half. The Institute of Science and Technology of China’s Population and Family Planning Commission collated and analyzed data from 39 cities and counties, including Beijing and Shanghai, and the results showed that the quality of men’s semen in China is also declining at a rate of 1% per year, with the number of sperm dropping by more than 40%; and the higher the degree of industrialization, the more pronounced the decline in the quality of the region’s sperm. The more industrialized the area, the more pronounced the decline in sperm quality. The first thing that is affected by the decline in semen quality is male fertility. A semen test, it is difficult to determine the “life and death” World Health Organization has had a survey, researchers have given birth to a number of men to carry out semen examination every two weeks, the results found that the highest number of sperm, up to more than 100 million, but some patients if the examination, just in a cold or tired state, the sperm quantity may be drop to more than 2 million all of a sudden. Therefore, the data of semen examination fluctuates, and you can’t live or die by a single report card, and you can know the approximate range of your semen quality by reviewing the test several times. Even if the semen test is not normal, it cannot be said to be infertile, only that, its semen quality is poor and fertility is low, but the possibility of fertility is still there. Moreover, even if all tests (including semen tests) are normal, male-induced infertility cannot be ruled out, and this would fall into the category of idiopathic infertility described earlier. In fact, the real value of semen analysis lies only in the convenience of the physician in distinguishing between three states: low fertility, uncertain fertility and good fertility. If the patient is found to have oligospermia (total number of sperm less than 15 million/mL), or weak sperm (total sperm motility < 40% or forward moving sperm < 32%), or dyszoospermia (< 4% of sperm in normal morphology), fertility is low, but it does not necessarily mean that infertility is present. If the man belongs to severe oligozoospermia, or even azoospermia, or severe weak spermatozoa or deformed spermatozoa, the responsibility of infertility is hard to shirk. However, fertility is a "cooperative project" between husband and wife, if the woman's health condition is relatively good, it can make up for the male low fertility problems. For example, some couples who have been married for many years with no children, and then divorced and reorganized their families, have children with their new spouses. This may be due to the fact that they have a "weak" combination, while the second marriage is a "strong" combination, so as to be able to repair the "fruit". Lifestyle changes are also important A study once showed that farmers who are exposed to pesticides, workers in the chemical and heat industries, electrical engineers, financial analysts, computer administrators and teachers are more likely to have fertility problems. Of course, patients are unlikely to give up their jobs as a result. However, there are some changes that can be made in life, such as wearing tight pants, smoking, drinking heavily, staying up late all the time and so on. In addition, we should also know some basic knowledge of fertility, such as: do not wait until ovulation to have sex, more than 7 days without sperm discharge, sperm aging, the quality of the opposite decline. In the ovulation period can be appropriate to increase the number of sexual intercourse and so on. Varicocele, do what you need to do Varicocele will affect the spermatogenic function of the testes and become serious with time. If men with varicocele are found in their 20s, 70% of them can still have good spermatogenesis; however, if they are still having varicocele at the age of 35, the quality of semen may be reduced due to the long term influence of spermatogenesis of the testes and the natural degeneration of testicular function, which may decrease the fertility. Therefore, adult men, even if they have no plans to have children, should be treated if they have abnormal semen tests along with varicocele.