The endometrial lining of the uterus is 11mm on the 10th day of menstruation, which is not normal. Women’s endometrial thickness will change with the changes in hormone levels, just after menstruation endometrium is the thinnest state in the entire menstrual cycle, about 3mm, ovulation endometrium thickening to about 8mm, before the onset of menstruation endometrial thickness of 10-13mm, the 10th day of menstruation is close to ovulation, endometrium 11mm is on the thicker side, generally not normal. Endometrium 11mm on the 10th day of menstruation, if the usual menstrual cycle, menstrual bleeding is normal can be observed first, the usual menstrual cycle is prolonged, menstrual bleeding is more, consider that it is caused by endometrial polyps, endometrial hyperplasia, etc., and need to be further treated by diagnostic scraping or hysteroscopy to determine whether there is any abnormality. Observe the endometrial thickness for any abnormality and go to the hospital for further examination and treatment.