Bleeding caused by endometrial abnormalities cannot be determined to be benign or malignant without testing, and further relevant tests are needed to determine this. Functional uterine bleeding during menopause, endometrial polyps, adenomyosis, fibroids, endometritis, and endometrial cancer may cause uterine bleeding. However, most are benign and a few patients may be malignant. If you are not sure whether it is benign or malignant, it is advisable to go to the hospital promptly in case of abnormal uterine bleeding. Under the doctor’s advice, gynecological ultrasound, endometrial scraping, pathological examination and other related tests are needed to determine the situation and then treat the symptoms.