If you live together without contraception for a full year without getting pregnant, you have \”infertility.\” The causes of infertility are complex, and may be caused by the man or the woman; there are congenital causes and acquired causes; female friends should master the necessary scientific knowledge of reproductive medicine to take preventive measures before they occur. Here are 5 warning signs that female infertility is on the horizon. Alert 1: Women suffering from endometriosis find clinical manifestations such as abnormal bleeding, dysmenorrhea, cyclic rectal and anal swelling, accompanied by painful reactions such as low back pain and dyspareunia.