After 4 years, Xiao Zhang couple has not been pregnant, the heart is quite anxious. Xiao Zhang is a steelworker, a muscle he thinks his body is strong enough. He thinks that usually although the working environment is hot, sweating more, but has been supplemented with water, should not be too much sweating caused by the problem ah. The results of the semen test showed that there were 1-2 slightly active sperm per high-powered field of view, and the doctor thought that it was almost impossible to get pregnant naturally. After a medical history and physical examination, the cause was finally pinpointed to the high temperature environment that Zhang is exposed to every day. So, why does high temperature affect male fertility? As we know, the testicles of men are located in the scrotum, which is about 3 degrees cooler than the normal body temperature at room temperature. Physiologically speaking, the lower temperature of the scrotum is conducive to the production of large amounts of fertility-bearing sperm by the testes. However, high temperatures, especially continuous hot environments, saunas or fever, can damage the spermatogenic function of the testes to varying degrees, causing apoptosis of spermatogenic cells and thus semen quality. Further studies have found that men with varicocele have a scrotal temperature about 1°C higher than the average male. This is one of the reasons why semen quality is abnormal due to varicocele. Even short-term exposure to high temperatures can cause sperm that are not sufficiently vigorous to “fall ill”. In the long run, this may even lead to azoospermia and complete loss of fertility. The consequences of high temperatures are even more serious when it comes to teenagers. The development of the testicles during the teenage years is still not perfect, and a long time of high temperature environment will prevent the normal development of the testicles, resulting in incomplete development of sperm cells, affecting the fertility of the future. Therefore, for men who are ready to have children, especially those who have poor semen quality themselves, it is important to avoid high temperature exposure as much as possible. After listening to the doctor’s advice, Xiao Zhang was temporarily transferred for six months, and as a result, his wife was happy.