There are many reasons for inability to have children, the common reasons are as follows: 1. Ovulation disorders, such as polycystic ovary syndrome, clinical manifestations of non-ovulation, obesity, menstrual scarcity or amenorrhea, hirsutism, etc. 2. Fallopian tube blockage, the channel for transporting eggs, such as inflammation leading to fallopian tube blockage, so that sperm and eggs can not be combined. 3. Uterus problems, congenital malformation of the uterus, endometrial adhesion, endometrium too thin or too thick can also affect fertilization, resulting in infertility. 4. 4. Low sperm motility and dead sperm of the male partner can also affect conception. If you have a normal sex life, no contraception, and no pregnancy for more than six months, you need to go to the hospital to have both spouses examined to clarify the cause and then treat the symptoms.