The most common causes of infertility are ovulatory dysfunction, such as endometriosis, where the foci are ectopic on the ovaries, or endocrine disorders, which can also cause ovulatory dysfunction. 2. obstruction of the fallopian tubes, where sperm and eggs cannot combine due to chronic inflammation, and therefore pregnancy cannot occur. 3. immunological infertility The immune infertility, such as having anti-sperm antibodies, anti-endometrial antibodies, etc., can also cause infertility. 4. Because of malformation of the uterus, abnormal development or too small uterus, it can lead to infertility. In addition, abnormal sperm of the male partner can also lead to infertility. Therefore, when infertility is found, you need to go to the hospital for a detailed examination. For example, if you have been married for a year and have not gotten pregnant while living together, you must go to the hospital for a detailed examination.