Endometrial hyperplasia itself it not cancer but it can eventually lead to cancer which is known as Uterine Cancer in some women.
Endometrial hyperplasia is most commonly caused by an excess of estrogen without progesterone (female hormones).
It doesn't always lead to Uterine Cancer but sometimes it can so you should always seek medical attention if you think it's leading to cancer or you have Endometrial hyperplasia.