60-year-old woman, ultrasound suggests that a small amount of fluid in the uterine cavity and thickening of the endometrium may be endometritis, which is relatively not serious at this time, or it may be due to abnormal endometrial hyperplasia and endometrial cancer, which is more serious at this time. 1. Endometritis: As postmenopausal women have poorer immunity, it may lead to bacterial upstream infection and endometritis, resulting in inflammatory exudation and inflammatory hyperplasia, causing a small amount of fluid in the uterine cavity as well as thickening of the uterine lining. 2. Abnormal endometrial hyperplasia: at this time, the endometrium is subjected to the continuous action of estrogen, and thickening occurs, and when bleeding exists, fluid accumulation in the uterine cavity may occur. There is even the risk of endometrial cancer, which needs scraping treatment, and this disease is more serious. 3. Endometrial cancer: at this time, malignant lesions have occurred in the endometrium, and the patient may also have bleeding and malignant fluid accumulation in the uterine cavity. It needs timely surgical excision treatment, which is also more serious. Therefore, if a 60-year-old woman has a small amount of fluid in the uterine cavity and thickening of endometrium, she needs to go to the hospital in time and improve the relevant examination under the guidance of the doctor and carry out the corresponding treatment.