If the menstrual period is one week early for two consecutive months, clinically it is commonly caused by the following reasons: 1. endocrine disorder, due to some reason the corpus luteum atrophies early, it makes the corpus luteum function insufficient, so the menstruation will come early. 2. submucosal fibroids can also lead to shortened menstrual cycle. 3. pelvic tumor or endometriosis may also make the menstruation early. It is recommended to have a detailed clinical examination, such as a blood test for sex hormone six and an ultrasound to find out if there are tumors in the pelvic cavity and to find out if there are fibroids in the uterus, and to give treatment according to the results.