The WHO defines infertility as the condition when both the husband and wife have no desire to remain childless. If they cohabit for more than a year with normal sexual relations and without taking any contraceptive measures and still fail to conceive, they are diagnosed with infertility. Infertility and irregular menstruation are not related, nor does infertility lead to amenorrhea. Amenorrhea or irregular menstruation is due to endocrine reasons. This requires blood tests for six hormone levels, thyroid function, and some endocrine metabolism indicators. These can cause difficulty in conceiving and lead to ovulation disorders. Infertility does not cause amenorrhea, but if amenorrhea occurs, it might affect pregnancy and lead to infertility. This is the relationship between them.