Infertility is defined as the absence of pregnancy after 1 year of cohabitation without the use of contraception. It can be further divided into primary infertility and secondary infertility according to whether or not a pregnancy has occurred after marriage. Primary infertility is defined as never having had a pregnancy; secondary infertility is defined as having had a pregnancy and then not having another pregnancy without contraception for more than 1 year. If you are planning to get pregnant and have the following conditions, you should seek early treatment: 1. no menstruation for more than 3 months 2. two or more spontaneous abortions 3. menstrual cycle equal to or shorter than 3 weeks 4. history of pelvic inflammatory disease 5. history of tuberculosis in the female partner 6. endometriosis in the female partner 7. acute or chronic prostatitis or varicocele in the male partner history of mumps in the male partner, history of toxic exposure in the male partner How to find out the cause of infertility? 1. To find out if the female partner has ovulation 2. To find out if the fallopian tubes are open 3. To find out if the male partner’s semen is normal 4. Other things such as ultrasound examination for uterine lesions, endometriosis, etc.