Whether it is normal for a woman to have an 8-day clean period depends on the patient’s specific situation. Firstly, if the patient is 8 days clean from the onset of menstruation, the amount of menstruation is normal and there is no special discomfort, this situation is normal. The menstruation within 7 days is normal in 60-70% of patients, and 30%-40% of patients are not within this range, but it has its own fixed cycle. Second, it is abnormal if the patient has a prolonged menstrual period in the late stage, accompanied by abnormalities such as heavy menstrual flow. It is necessary to consider that the patient may have endocrine disorder or endometrial polyp, birth control ring migration and other organic lesions. The first step is to do an internal gynecological examination, cervical screening, and gynecological ultrasound for initial screening, and determine the next step of examination and treatment based on the results of the screening.