Vaginal ultrasound is not able to diagnose whether there is endometrial cancer or not, but it can make a preliminary judgment and provide reference for further examination. Vaginal ultrasound can be useful in determining endometrial cancer, which can find out the size of the uterus, the shape of the uterine cavity, the presence or absence of abnormal organisms in the uterine cavity, the thickness of the uterine lining, the presence or absence of infiltration of the myometrium, etc. It can make a preliminary judgment of the cause of the irregular vaginal bleeding and provide a reference for further examination. If abnormalities are found in vaginal ultrasound, such as disappearance of the uterine line, presence of redundant organisms in the uterine cavity, and rich blood flow signal, it is necessary to do further examination, such as diagnostic curettage, which is usually performed in segments, followed by pathological examination, which is the basis for confirming the diagnosis of endometrial cancer. To determine whether there is endometrial cancer, hysteroscopy can also be performed, which can directly observe whether there are cancer foci in the uterine cavity and cervical canal, and biopsy can be performed under direct vision, which makes the diagnosis of focal endometrial cancer more accurate.