When endometrial cancer occurs in women, it first manifests as abnormal proliferation of the endometrium, increased endometrial surface area, and increased secretions, which can increase the pressure inside the uterine cavity, leading to lower abdominal pain in women. Most women can tolerate this pain, but it tends to worsen during vigorous activities or sexual intercourse. Vaginal discharge may become watery and increase. Additionally, some women may experience increased menstrual flow or irregular vaginal bleeding. Over time, this can lead to blood loss anemia in women, manifesting as dizziness, fatigue, and changes in appetite.