Infertility is defined as a couple of childbearing age living together after marriage without contraception and having a normal sexual life, but not having conceived for 2 years. The general conception rate in January after marriage is about 15% and the cumulative conception rate in one year is about 90%, so if you have not conceived after 3-4 months of planning to conceive, please do not be anxious, this is a normal phenomenon and do not put too much pressure on yourself, but if some couples have not conceived in one year, they should consult a doctor as soon as possible and do not miss the opportunity of treatment. The causes of infertility include female, male and both male and female factors. Female factors generally include: (1) tubal factors; (2) ovarian dysfunction such as ovulation disorder and polycystic ovary syndrome; (3) uterine factors including uterine malformation and endometrial lesions; (4) endometriosis, etc. Male factors include: abnormal semen, abnormal sexual function, etc. Factors of both partners include: lack of basic knowledge of sexual life, excessive mental tension, immune factors, etc.