Why does a miscarriage cause black blood flow?

Patient's question:

Yesterday when I went for my prenatal check-up, I found out that I had a miscarriage. At the same time, I noticed that I was bleeding black blood. Why does a miscarriage cause black blood?

Doctor's answer:

Upon careful examination, it was found that there has been a missed miscarriage, and it is also possible to have black peeling. The missed miscarriage may be related to the peeling occurring before it. Missed miscarriage is generally related to chromosomal abnormalities, and it may also be due to interference from adverse factors in the uterine cavity, such as radiation, medication, and other factors. It is recommended to undergo a D&C procedure promptly after a missed miscarriage and to rest well after the surgery. It is also recommended to investigate the cause of the missed miscarriage or reflect on it to prevent it from happening again in the future.

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