The menstrual period of 2-7 days is a normal range for women, because the IUD has a certain degree of interference with the endometrial repair, so the menstrual period can be extended to about 10 days for women with the IUD. A woman’s menstrual period is due to the shedding of the thickness of the endometrium caused by the withdrawal of estrogen and progesterone levels in the body, which is accompanied by the gradual repair of the endometrium at the end of the period. If you find that your period drags on within the normal time frame and does not clear, do not be nervous and afraid. The following causes need to be considered: 1. inflammation of the uterine body, which in Chinese medicine means inflammation of the uterine body can lead to poor menstrual flow and obstruction of the menstrual blood. 2. if the menstrual period is repeatedly prolonged, it is necessary to check the level of sex hormone secretion combined with ultrasound for diagnosis and treatment. 3. if there is an intrauterine device, it is recommended that the intrauterine device be removed and then the menstrual period be observed.