The union of sperm and egg into a fertilized egg is the beginning of human life and the germination of a new generation. However, the beginning of life is not easy to achieve, and the union has to go through a lot of hardships, obstacles, and twists and turns before it finally comes to fruition. Once the sperm enters the vagina, the search for the egg begins. This is an extremely arduous process that involves struggling through a distance several thousand times the length of the sperm itself (a distance of about 15 CM), as well as crossing important “hurdles” such as the cervix, cervical canal, uterine cavity and fallopian tubes. According to research, although men have 400-600 million sperm entering the vagina in one ejaculation, the last ones to reach the egg are only about 200, and the least are only 15-20. The cervix is the “door” to the uterus, the only passage from the vagina to the uterine cavity, and the first barrier for sperm to travel the long way to meet the egg. After entering the vagina, hundreds of millions of live sperm swim at an alarming rate towards the cervix, which is the place where sperm must compete. Since the cervix is very small, the sperm that come one after the other are bound to collide, squeeze and rub, thus causing a lot of deaths. If the cervical opening is narrow, eroded or has bacteria and white blood cells, they can kill and swallow sperm or consume the energy material in the semen, reducing sperm motility and shortening the life span of sperm. Since the number of sperm passing through the opening of the cervix is greatly reduced, this can potentially lead to infertility. According to statistics, infertility due to cervical factors accounts for about 5% of infertile women. The cervical canal, which is about 2.5 cm long from the outer cervical opening to the uterine cavity, is also full of traps and hazards, and sperm that have successfully passed through the cervical opening must still overcome this hurdle before they can move on. First of all, the cervical canal resembles a bottle mouth with a sticky mucus plug. This is mainly to keep the cervix isolated from the vagina and protected from the bacteria in the vagina. For sperm, it is a barrier that is difficult to surpass. However, near the eve of ovulation, this mucus plug becomes clear and thin under the influence of ovarian hormones, which gives the green light for the passage of sperm. If there is a serious cervical laceration, endocervical canal inflammation, or abnormal excitation of the autonomic nerves and dysregulation of ovarian hormone secretion, it can cause abnormal secretion and changes in the nature of the cervical canal mucus, thus disrupting the chemotaxis of sperm, which can also lead to infertility. Secondly, the endocervical canal has a large number of folds, which can not only make a large number of sperm trapped and die, but also potholes and bumpy roads, enough to make the sperm exhausted, many sperm in the consumption of quietly die. If you are suffering from endocervicitis, not only can you hurt the sperm, you will also prevent the sperm from drawing nutrients from it, so that it does not get the chance to rest and breathe and midway or can. Therefore, it is believed that the percentage of infertility caused by cervical factors far exceeds that of the uterine body itself, which is one of the important causes of infertility.