The cause of placental abruption is unknown in most cases. Maternal hypertension has been identified as a consistent risk factor. Cigarette smoking, cocaine use and poor nutrition are associated with increased risk. External abdominal trauma as a result of falls, motor vehicle accidents or battering can result in placental abruption.
A definitive cause for placental abruption is usually difficult to pinpoint. It some cases, though, doctors can link the condition to certain factors, including: an umbilical cord that is much shorter than normal direct impact or blow to the pregnant woman's belly (like that experienced in a car accident or injury) a severe reduction in the amniotic fluid in the uterus
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