Common causes of infertility in women often stem from ovulatory disorders and tubal factors. The common ovulatory disorders mainly include dysfunction of the hypothalamic-pituitary-ovarian axis, ovarian diseases, and endocrine metabolic diseases such as hyperthyroidism or hypothyroidism. Other causes include systemic diseases, chronic consumptive diseases, severe malnutrition, excessive obesity, and excessive thinness. The second aspect involves tubal factors, such as inflammation and blockage of the fallopian tubes leading to infertility. The third aspect is uterine factors, which include poor uterine development, uterine abnormalities, endometritis, and endometrial tuberculosis, all of which can cause infertility. The fourth aspect is cervical factors, including cervical myomas, cervical inflammation, and abnormalities in cervical immunological function. The fifth aspect is factors related to the vaginal and perineal areas, where abnormal development, inflammation, and scarring of the vagina can cause infertility. As for men, the causes of infertility include abnormalities in semen, sexual function, and immunological factors. Immunological factors primarily involve the production of antibodies against one's own sperm in the body, causing ejaculated semen to agglutinate with itself and fail to pass through cervical mucus. Thus, from the perspectives of both men and women, these are the main causes of infertility.