Whether the endometrium 7mm is normal or not depends on which day of the menstrual cycle it is in, if it is in the ovulation and luteal phase is normal, if it is the follicle in the early and middle period belongs to the thicker. Generally speaking, the endometrium will be subject to changes in estrogen and progesterone, usually before menstruation, the body’s estrogen is high, the endometrium will thicken. Ovulation endometrium 7mm is more normal, luteal phase almost reached 10mm or so, if just after menstruation, the endometrium in the role of hormones shedding bleeding, just after menstruation, the endometrium is generally 3-4mm, if this time 7mm, then it is on the thick side. If the thickness of the endometrium is abnormal, hysteroscopy is needed.