What's wrong with unfixed periods?

Menstruation is not fixed, mainly due to endocrine disorders, there may be gynecological diseases caused, such as endometrial hyperplasia, endometrial polyps endometriosis, do not rule out the possibility of uterine fibroids, should do a good job of abdominal warmth, and to the regular hospital's gynecology to do sex hormone six b-ultrasound examination