An endometrial thickness of 8mm is normal if you are ovulating. A woman’s uterine lining changes with the menstrual cycle, just after menstruation, the thickness of the uterine lining is usually about 3-5mm, to the time of ovulation, the thickness of the uterine lining is about 7-8mm, and to the time of the pre-menstrual period, the thickness of the uterine lining will be about 9-11mm. Endometrial thickness of 8mm if just after the period, or pre-menstrual period are abnormal phenomena, it is recommended to go to the hospital for hormone six tests, anti-mullerian tube hormone test, etc., in order to clarify the diagnosis. Endometrial abnormality, you need to consult a doctor for a clear diagnosis, so as not to delay the condition.