Endometrial cancer is a group of epithelial malignant tumors occurring in the endometrium, with adenocarcinoma originating from the endometrial glands being the most common, and is one of the three major malignant tumors of the female reproductive tract (cervical cancer, endometrial cancer, and ovarian cancer). It is divided into estrogen-dependent (type I) and non-estrogen-dependent (type II), and type II has a poor prognosis. Endometrial cancer is a tumor that is easily detected at an early stage. Although these patients can be detected without any abnormal signs during gynecologic examination, the majority of endometrial cancer patients present with symptoms of vaginal bleeding or vaginal drainage at an early stage, and these symptoms are often the reason for these patients to seek medical attention; less than 5% of endometrial cancer patients are reported to be asymptomatic in the literature. These patients with vaginal bleeding mainly present with irregular bleeding or postmenopausal vaginal bleeding, usually in small amounts, and may present with menstrual cycle disorders in those who are not yet menopausal. Vaginal discharge, mostly bloody fluid or plasma discharge, or pus and blood discharge with bad odor in advanced stage patients with combined infection, accounts for about 25% of patients who visit the clinic for abnormal vaginal discharge. Lower abdominal pain. If the cancer involves the endocervix, it may cause pus accumulation in the uterine cavity and lower abdominal distension and cramp-like pain. Since many benign diseases and gynecologic endocrine disorders also manifest as irregular vaginal bleeding/menstrual disorders, it is especially important to identify endometrial cancer among these bleeding patients. Women with abnormal vaginal bleeding with the following conditions should be alerted to endometrial cancer: those with risk factors for endometrial cancer such as obesity, infertility, delayed menopause; those with a history of long-term use of estrogen, tamoxifen or estrogen-increasing diseases; those with family history of breast cancer and endometrial cancer. Clinically, serum CA125 measurement, vaginal ultrasonography, magnetic resonance imaging (MRI), computed tomography (CT) scan, diagnostic segmental curettage, hysteroscopy and other adjuvant means are used to diagnose endometrial cancer.