What is the reason for dark blood before menstruation?

Patient's question:

In the past six months, about a week before each menstrual period, my leukorrhea has turned coffee-colored, with occasional small amounts of blood. During the normal menstrual period, the flow is still quite heavy, with a duration of five days, and it becomes relatively clean afterward. In the next cycle, it starts with small amounts of bleeding a week early again. What could be the reason for this? What kind of medication should I take to regulate it? Thank you!

Doctor's answer:

Before menstruation, there is brown discharge. Brown discharge before menstruation may be caused by blood mixed with cervical mucus. This condition usually occurs about one or two days before menstruation and gradually improves over time. Additionally, factors such as stress, endocrine disorders, and external influences can also lead to brown cervical mucus.
If you have brown cervical mucus regularly, it may indicate irregular menstruation, hormonal imbalances, vaginal diseases, cervical diseases, or endometrial diseases. These gynecological conditions can all cause changes in cervical mucus color.

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