Why do miscarriages happen?

Patient's question:

All symptoms: Hello, when I was six weeks pregnant, I had an ultrasound to check the fetal heartbeat, embryonic stalk, and primitive heart tube. The doctor said the development was good. However, by the seventh week, I had brownish discharge, and then I had another ultrasound. The fetal heartbeat was no longer detectable, but the embryo was still about the same size as it was at six weeks. I haven't had any early pregnancy symptoms. Additionally, I haven't used contraception since mid-last year and only got pregnant recently, but the heartbeat stopped soon after. What could be the reason for this? I have had an abortion in the past.
Onset time and cause: Treatment status:
What help do you need: What could be the reason for this?

Doctor's answer:

Miscarriage is usually due to poor embryo development, which is a natural process of survival of the fittest. There's no need to overthink it. Additionally, the current level of pollution is severe, which is also a cause of miscarriage. There are many reasons that can lead to embryonic arrest, mainly including the following aspects: incomplete embryo development, abnormal fertilized eggs; poor placental development, Rh incompatibility between mother and child; endocrine dysfunction in women, reproductive organ diseases; systemic diseases in women during pregnancy; trauma or sudden emotional changes during pregnancy in women; male sperm quality issues, etc. It is recommended to go to the hospital for a detailed examination and symptomatic treatment.
If you experience multiple instances of embryonic arrest, it is necessary to undergo a comprehensive pre-pregnancy examination at the hospital to determine if there are any underlying health issues. This includes chromosomal testing as well. I hope this helps, and wish you health and happiness.

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