Infertility is diagnosed when a couple fails to conceive after one year of contraceptive-free sex (six months if the woman is older than 35), or if the pregnancy is not successfully maintained until live birth. If you and your spouse have not been able to conceive after one year of contraceptive-free, regular sex, you should seek medical attention. In some cases, even if you have only been trying for six months with no results, it is time for you to see a doctor. The causes are as follows: 1. the woman is older than 35 years old; 2. irregular periods or amenorrhea; 3. two or more miscarriages; 4. previous use of an intrauterine device (IUD); 5. the man has had a prostate infection; 6. either partner has a history of sexually transmitted diseases; 7. either partner has a history of pelvic or genital infections; 8. either partner has had surgical birth control restoration; 9. the woman has endometriosis or dysmenorrhea 10. The female partner has breast overflow; 11. The female partner has excessive acne or hirsutism (excessive body hair); 12. No menstrual flow after using the contraceptive medication medroxyprogesterone acetate; 13. Either partner has chronic diseases (such as diabetes, hypertension, etc.); 14. Either partner has a history of receiving chemotherapy or radiotherapy.