Why does bleeding still occur after taking birth control pills for dysfunctional uterine bleeding?

Patient's question:

Irregular menstruation, continuous bleeding. After two days of intramuscular injection of a triphasic hormone, the bleeding stopped. Switched to taking Compound Levonorgestrel Tablets, one tablet daily. On the fourth day, added Six-Flavor Rehmannia Pills. By the fifth day, there was already a very small amount of bleeding (), accompanied by breast tenderness and lower back pain. After taking it for a long time, on the tenth day, experienced flushing and feverishness. The menstrual flow continued to increase significantly. Stopped taking Six-Flavor Rehmannia Pills, but symptoms did not change. Two days later, visited the doctor, with a temperature of 39°C and tonsillitis. The doctor prescribed antipyretic injections and anti-inflammatory drips. By the third day, the fever subsided, but the menstrual bleeding continued as before, with medium flow, red in color, viscous, and persistent.
Unknown treatment history and effectiveness: During this period, did not stop taking Compound Levonorgestrel Tablets. Today is the 19th day, with a relatively fixed dosing time, with an error not exceeding 4 hours. What kind of help is needed: Please help me make a prediction.

Doctor's answer:

The causes of menstrual irregularities can be divided into two major categories:
1. Neuroendocrine dysfunction leading to endocrine disorders: Primarily related to the instability or abnormalities in the hypothalamic-pituitary-ovarian axis, which is known as menstrual disorders.
2. Organic inflammation or drug-induced factors: Includes local inflammation of the reproductive organs, tumors, and developmental abnormalities; intracranial disorders; other endocrine dysfunctions such as thyroid, adrenal cortex dysfunction, diabetes, Sheehan's disease, etc.; liver diseases; blood disorders, etc. The use of psychiatric medications; endocrine preparations; or the use of an intrauterine device (IUD) during breastfeeding may also lead to menstrual irregularities.

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