Clinically, a period that lasts longer than 9 days is considered abnormal and is not necessarily caused by cancer. For example, inflammation of the endometrium, polyps in the endometrium, atypical hyperplasia of the endometrium or endocrine disorders may cause menstruation that does not last for a month. In addition, if the endometrium is indeed cancerous, it may also lead to incomplete menstruation, and it is recommended that the diagnosis be made only through appropriate tests. For example, blood tests, clotting time, ultrasound, and gynecological examinations are needed to find out whether there are abnormalities in the uterine adnexa and the cervix. If there is abnormal thickening of the endometrium or uneven echogenicity or abnormal masses in this case, diagnostic scraping must be done and the scraped tissue should be sent for pathological examination for pathological diagnosis.