Thick endometrium with many blood clots may be caused by endometrial hyperplasia, polyps, tumors and other factors. It is recommended to consult a doctor for a clear diagnosis and give medication under the doctor’s guidance, or you can also be treated by surgery. 1. Endometrial hyperplasia: The cause of endometrial hyperplasia has not been fully clarified, and it is considered to be related to the imbalance of estrogen and progesterone levels. Some patients may be accompanied by functional bleeding, it is recommended to give appropriate medication under the guidance of the doctor, such as progesterone, dydrogesterone, can help improve; if necessary, timely scraping to send pathological examination to exclude malignant lesions. 2. Endometrial polyps: Long-term inflammatory stimulation, endocrine disorders, pathogen infection may lead to polypoid changes in the endometrium. Patients mainly show prolonged menstrual period, heavy menstrual flow and irregular vaginal bleeding. The polyps can be removed by hysteroscopy, and megestrol and progesterone can be given after the operation to prevent recurrence. 3. Endometrial tumor: endometrial tumors such as endometrial cancer may also lead to thickening of the endometrium, which may cause heavy clotting bleeding. It is recommended to consult the doctor in time, and can be treated by surgery or with radiotherapy. Endometrial thickening with a lot of blood vessels is recommended to draw attention to, timely visit the gynecology department of the hospital, combined with the doctor to deal with, to avoid dangerous situations.