Endometrial mesenchymal sarcoma is not cancer. There is a difference between sarcoma, which is a malignant tumor originating from mesenchymal tissue, and cancer, which originates from epithelial tissue. Endometrial mesenchymal sarcoma accounts for about 30~40% of uterine sarcomas, which is a kind of malignant tumor originated from endometrial mesenchymal cells. Patients present with increased menstruation, irregular vaginal bleeding, anemia, and lower abdominal pain. Endometrial mesenchymal sarcoma produces compression symptoms, which manifest as painful swelling of the affected area. Patients with endometrial mesenchymal sarcoma or cancer need to undergo ultrasound examination, CT examination, tumor marker examination, and pathological biopsy examination. Patients with endometrial mesenchymal sarcoma or cancer need to consult a doctor to clarify their condition and follow standardized treatment, and should not take medicine blindly.