What is a common sign of placenta previa?

A common sign of placenta previa is painless vaginal bleeding, which occurs as a result of the placenta being positioned low in the uterus, covering part or all of the cervix. This condition can lead to bleeding during the later stages of pregnancy or during labor, often without accompanying pain. This characteristic painless bleeding distinguishes it from other conditions that may cause abdominal pain or discomfort during pregnancy, where pain typically indicates a more acute issue.

In contrast, symptoms like severe abdominal pain, frequent urination, and high fever are not typical indicators of placenta previa. Severe abdominal pain may suggest complications such as placental abruption, while frequent urination can occur in many pregnancy scenarios but does not specifically point to placenta previa. A high fever could indicate an infection, which is also unrelated to the symptoms of placenta previa. Therefore, painless vaginal bleeding is the hallmark symptom that indicates this condition.