Is an endometrial thickness of 18mm serious?

An endometrial thickness of 18 millimeters may require further evaluation, but whether it is serious depends on the specific circumstances. Under normal conditions, endometrial thickness varies at different stages of the menstrual cycle, generally increasing gradually after menstruation and reaching a peak around ovulation, typically not exceeding 14 millimeters. If measured at 18 millimeters outside of the menstrual period, this may indicate abnormalities such as endometrial hyperplasia, endometrial polyps, or in rare cases, endometrial cancer.

However, assessment should take into account individual symptoms, age, reproductive history, and imaging results. If accompanied by abnormal bleeding, pain, or other symptoms, doctors may recommend further tests, such as hysteroscopy or tissue biopsy, to determine the cause and develop an appropriate treatment plan.