What factors cause the menstrual blood to be black?

Patient's question:

My last month's menstruation was black, and it's also black this month. What should I do? But it's not much, just like usually, how many days will it be good? First question supplement: I don't know what kind of symptom it is, it seems like there's also a fever, there's also heart trouble, love to dream, etc., what should I do?

Doctor's answer:

Hello: Dark-colored and low menstrual flow is generally related to endocrine disorders, gynecological inflammation, and other factors. There are many reasons for low menstrual flow, in addition to possible luteal function insufficiency, abnormal thyroid and prolactin function, or a history of induced abortion or endometrial adhesion, all of which are possible contributing factors.
The duration of menstruation is typically 3-7 days. During a single menstrual period, bleeding of 30-80 milliliters of blood mixed with endometrial fragments and mucus is dark red, relatively viscous, and does not clot easily.

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