What factors or causes can lead to habitual abortion?

Patient's question:

I've been married to my husband for over a year. Around 50 days into the pregnancy, I had a miscarriage. The doctor said I have a history of miscarriages. Before getting married, we had an abortion using medication once. Since getting married, our whole family has been very hopeful that I could get pregnant, so this miscarriage put a lot of pressure on me. Especially my mother-in-law, she really hopes to hold her grandson in her arms as soon as possible, and seeing her disappointed expression makes me very sad.

Doctor's answer:

Hello, habitual abortion refers to the occurrence of three or more consecutive spontaneous abortions, where each miscarriage often happens in the same gestational month. In Traditional Chinese Medicine, it is known as "huatai" (slippery). The factors or causes of habitual abortion are mostly due to luteal phase deficiency in pregnant women, hypothyroidism, congenital uterine malformations, uterine developmental abnormalities, intrauterine adhesions, uterine fibroids, chromosomal abnormalities, and autoimmune conditions. Habitual late miscarriage is often caused by cervical incompetence. This is frequently due to cervical damage resulting from procedures such as curettage or cervical dilation, though it may occasionally be due to congenital developmental abnormalities.

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