Postmenopausal bleeding is not necessarily cancer. It can also be caused by other reasons such as trauma, inflammation, certain gynecological diseases, and exogenous hormonal stimulation. 1. Trauma: trauma involving the uterus, cervix, vagina, vulva, urethra, and perianal area may cause bleeding. 2. Inflammation: the most common is senile vaginitis. After menopause due to the vaginal epithelial mucosa atrophy, lower resistance, easy to infection and congestion, prone to senile vaginitis, a small amount of bleeding. In addition, bacterial vaginitis, endometritis and so on may appear bleeding. 3. Certain gynecological diseases: such as uterine fibroids, when suffering from uterine fibroids, when the tumor is large, or when the fibroid is accompanied by necrotic infection, there can be irregular vaginal bleeding. In addition, cervical erosion, cervical polyps, etc. can also cause bleeding. 4. Hormonal stimulation: If there is hormone replacement therapy after menopause, or long-term oral estrogen-containing health care products, etc., the hormonal stimulation can also cause rebleeding after menopause. There are many reasons for postmenopausal bleeding, and the possibility of various diseases should be taken into consideration. Postmenopausal bleeding is not necessarily cancerous, but the possibility of cancer should be carefully ruled out, and the patient should consult the doctor as soon as possible for a clear diagnosis.