There is no reason why pregnancy does not suddenly come.

The main reasons for sudden absence of menstruation include drug effects, endocrine disorders, gynecological diseases, etc.

1, drug effects

Didrogone tablets, progesterone capsules, compound norethisterone tablets, norethisterone tablets and other drugs may interfere with the hormone metabolism in the body, causing menstruation does not come.

2, endocrine disorders

When the endocrine system of the body disorders, such as long-term mental stress, irregular work and rest, excessive diet or overeating, etc., may affect the balance of hormone levels, resulting in abnormal menstrual cycles.

3, gynecological diseases

polycystic ovary syndrome, premature ovarian failure, endometriosis and other gynecological diseases, may lead to abnormal menstruation or even amenorrhea. Take polycystic ovary syndrome as an example, which can lead to high androgen levels, ovulation disorders, causing menstruation or amenorrhea.

It is recommended to go to the hospital for detailed examination, including B-ultrasound examination, sex hormone six tests, etc., to clarify the specific reasons for sudden absence of menstruation.