No menstruation, no pregnancy.

This condition is basically considered to be caused by endocrine disorders, because when the body's accumulation of endocrine disorders will show such a phenomenon. In clinical patients with polycystic ovary syndrome, they will show that menstruation is rare and the amount has been very small, and there will be a few months of menstruation, because there may also be hypothyroidism caused by menstruation. There are also people, if they are over 40 years old, who should consider that menstruation does not come due to the decline in ovarian function.