The medical definition of infertility is the absence of a successful pregnancy after one year of normal sexual intercourse without using any contraception. The main categories are primary infertility and secondary infertility. Primary infertility is defined as never having conceived; secondary infertility is defined as having been pregnant and then being infertile. According to this strict definition, infertility is a common problem that affects approximately at least 10-15% of couples of reproductive age. The causes of infertility are classified as male infertility and female infertility. Common classifications are as follows: i. Male factors: male semen abnormalities or sexual dysfunction. II. Female partner’s age and ovarian reserve function: Female fertility starts to decline after the age of 30 and accelerates after the age of 40. As the quality of eggs decreases with age, the ability to conceive is weakened. Ovulation disorders and luteal malfunction: Ovulation abnormalities such as polycystic ovary syndrome, hypothalamic ovulation abnormalities, pituitary ovulation abnormalities and ovarian ovulation malfunction. IV. Tubal and peripheral infertility. Uterine infertility: endometrial polyps, uterine fibroids, uterine adhesions, congenital developmental abnormalities, etc. VI. Cervical and immunological infertility. Infectious infertility: mycoplasma, chlamydia, tuberculosis, bacterial vaginitis. VIII. Unexplained infertility.