What are the reasons for the shedding of the endometrium?

Patient's question:

Menstruation has blood clots, then I poked it open and it looked like blood membrane, I was startled. I took it to the hospital to show the doctor, and the doctor said it was endometrial shedding. It's also like this this month. I don't know if it's a problem or not, because I'm currently trying to get pregnant and don't know if it will affect it? Thank you!

Doctor's answer:

Hello! Many women experience some lumps during their menstrual period, and many worry if they might have uterine fibroids or some more serious condition. In fact, those lumps are caused by the shedding of the endometrium. A regular shedding of the endometrium is normal and occurs alongside the menstrual period.
The reasons for endometrial shedding: The corpus luteum usually survives for about 14 days before atrophying. The endometrium sheds due to a lack of support from estrogen and progesterone hormones. Irregular endometrial shedding is caused by dysfunction in the hypothalamic-pituitary-ovarian axis, leading to incomplete atrophy of the corpus luteum. As a result, the endometrium continues to be influenced by progesterone and cannot shed completely on schedule.
During the normal menstrual period on days 3-4, the secretory endometrium has fully shed and is replaced by the regenerating proliferative endometrium. However, in cases of endometrial

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