Endometrial hyperplasia generally refers to hyperplasia of the endometrium. The exact time when cancer may occur varies from person to person, and it is not certain that cancer will occur once endometrial hyperplasia exists; specific problems need to be analyzed. If endometrial hyperplasia is a manifestation of precancerous cervical lesions, such as complex endometrial hyperplasia or mixed hyperplasia, it may take only about 2-5 months for cancer to occur if the patient does not receive timely treatment. If endometrial hyperplasia is due to sudden hormonal imbalance or disorder stimulation of the body, it is simple hyperplasia, mostly seen in endometritis, endometrial polyps, etc. Patients usually do not develop cancer and need not worry excessively. Patients are advised to go to the gynecology or oncology departments of hospitals promptly after the occurrence of the above mentioned symptoms, so that professional doctors can conduct examinations to clarify the causes and then carry out targeted treatment.