Doing abdominal ultrasound endometrial thickness is more accurate. The thickness of the endometrium changes with the menstrual cycle. The normal thickness of the endometrium varies from 5-10mm, the thickness of the endometrium in the proliferative stage can reach 3-5mm, the endometrium in the secretory stage can reach 5-7mm, the thickness of the endometrium in the menstruation stage can reach 8-10mm, and the thickness of the endometrium of women in the menopause is usually less than 5mm. Doing abdominal ultrasound can understand the thickness of the endometrium, and the test results will be more accurate, too thick or too thin endometrium has an impact on the body, too thick endometrium will cause irregular bleeding, prolonged menstruation, increased menstrual flow, too thin endometrium will affect the menstruation and conception, resulting in a low menstrual flow, and easy to be conceived after the first sign of miscarriage. Women have to go to regular hospitals for checkups so that the measured thickness of the endometrium is more accurate.