Is menstrual irregularity related to a lack of progesterone??

Patient's question:

Expert,
I have only had one normal menstrual cycle since my surgery in July this year. In terms of color and volume, it was relatively normal. However, since September, my menstruation has become irregular—sometimes once a month, sometimes twice a month. The volume is not much, and the color ranges from bright red to dark black. It also only takes 7 days to clean up.
Last month, it started on the 24th, and now, it has started again on the 9th of this month. The volume is not much, and the color is bright red.
Previously, when it was normal, I would experience breast tenderness and pain before menstruation. Now, I don’t feel that sensation anymore. Sometimes, I feel a bit uncomfortable in my stomach, but it’s not severe pain. What do you think about the surgery being related to this?

Doctor's answer:

Generally, menstrual disorders are divided into two major categories. The first category is caused by neuroendocrine disorders, including uterine bleeding during puberty and menopause, which are all caused by this. The second category is primarily due to changes in the reproductive organs, including inflammation of the reproductive organs. For example, endometritis, tumors, tumors growing on the uterus, and ovarian tumors, including some granulosa cell tumors of the ovary. These tumors secrete estrogen, which can cause menstrual disorders. Additionally, the ovary secreting androgens can also affect the menstrual cycle, leading to menstrual disorders.

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