What is a common sign of placenta previa?

Painless vaginal bleeding is a classic sign of placenta previa. This condition occurs when the placenta is abnormally positioned in the lower part of the uterus, covering or being near the cervix. As the pregnancy progresses, the lower uterine segment stretches, which can lead to the placenta detaching from the uterine wall and causing bleeding. This bleeding often occurs without the accompanying pain that would typically be seen with other obstetric complications such as placental abruption or labor contractions.

In the context of this question, recognizing the signs of placenta previa is crucial for timely medical intervention to ensure the safety of both the mother and the fetus. Painless vaginal bleeding can be a serious symptom and often requires monitoring and possibly delivery planning, especially if the bleeding is significant or if the pregnancy approaches term.

In contrast, painful abdominal cramping, severe back pain, and nausea and vomiting may relate to a variety of other pregnancy complications or conditions but are not characteristic signs of placenta previa. Hence, identifying painless vaginal bleeding as a key symptom is critical for appropriate management of this condition.