Patients with cervical cancer do not have symptoms in the early stage and will not affect their menstruation. The shortening of menstrual cycle may be caused by the following reasons: 1. Submucosal fibroids or large interstitial fibroids may shorten the menstrual cycle and manifest as increased menstrual flow and increased leucorrhea. 2. Shortening of menstrual cycle due to luteal insufficiency, often in the second half of menstruation, may also cause irregular vaginal bleeding. 3. Inflammation of the endometrium, endometrial cancer, atypical hyperplasia of the endometrium or endometrial polyps may cause shortened menstrual cycle, so it is recommended to go to the hospital for corresponding examination and then give adjustment.