What causes endometrial hyperplasia?

Endometrial hyperplasia is too long, generally can be divided into simple hyperplasia, complex hyperplasia and atypical hyperplasia. Simple hyperplasia is generally related to the environment and estrogen and progesterone stimulation, complex hyperplasia and atypical hyperplasia, often accompanied by hypertension, diabetes, breast cancer and other medical history, need to pay attention to hyperplasia has the possibility of cancer.