Menstruation postponed 20 days, dipstick examination shows negative how to return a responsibility

It is normal for a woman's menstruation to advance or delay within a week. If menstruation is delayed by 20 days, after pregnancy is ruled out, it may be caused by endocrine disorders, which are related to mental stress, staying up late, diet and other factors. In addition, when suffering from gynecological inflammation, such as vaginitis, cervicitis, endometritis, pelvic inflammatory disease, etc., menstruation can also be delayed.