A low lying placenta is a placenta implanted in the lower uterine segment, but not covering the internal cervical os. Vaginal bleeding is the most common symptom of a low-lying placenta. The bleeding is painless, bright red and occurs during the later stages of the pregnancy. The bleeding of a low-lying pregnancy is associated with the changes in the lower uterine segment as the body prepares for labor, but since the placenta is not flexible, the stretching of the uterine muscle causes disruption at the placental/uterine interface and results in bleeding.
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