7 doctors weighed in:
Why is the bleeding painless from placenta previa?
7 doctors weighed in

Dr. Nikolaos Zacharias
Obstetrics & Gynecology - Maternal Fetal Medicine
3 doctors agree
In brief: No contractions.
Because the bleeding does not involve the contractile part of the uterus, only the placenta over the cervix.
The placenta is devoid of innervation, therefore the mother does not experience pain in bleeding previa unless preterm labor is also present.

In brief: No contractions.
Because the bleeding does not involve the contractile part of the uterus, only the placenta over the cervix.
The placenta is devoid of innervation, therefore the mother does not experience pain in bleeding previa unless preterm labor is also present.
Dr. Nikolaos Zacharias
Dr. Nikolaos Zacharias
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Dr. Nasiruddin Mansury
Pediatrics - Neonatology
1 doctor agrees
In brief: Placenta prevIa
The stretching of lower uterine segment causes the disruption in blood supply to the plaventa.
The blood usually comes out of the internal os. So this bleeding is painless. Rarely is there is collection of blood behind placenta than it can be painful.

In brief: Placenta prevIa
The stretching of lower uterine segment causes the disruption in blood supply to the plaventa.
The blood usually comes out of the internal os. So this bleeding is painless. Rarely is there is collection of blood behind placenta than it can be painful.
Dr. Nasiruddin Mansury
Dr. Nasiruddin Mansury
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Dr. Brian Nguyen
Obstetrics & Gynecology
In brief: Leaky placental vsls
Previa: Placenta overlies the cervix/birth canal.
Gr 1 means placenta is close, Gr 4 means it's directly overlying/blocking the baby's exit -- high chance of preterm labor & bleeding; you'd need a C/S at 36-37wks. More common in woman w/ hx of C/S & smoking. Not much you can do but wait. If dx'ed early, the uterus still grows/stretches and a placenta can migrate away even in 3rd tri. Follow w/ US.

In brief: Leaky placental vsls
Previa: Placenta overlies the cervix/birth canal.
Gr 1 means placenta is close, Gr 4 means it's directly overlying/blocking the baby's exit -- high chance of preterm labor & bleeding; you'd need a C/S at 36-37wks. More common in woman w/ hx of C/S & smoking. Not much you can do but wait. If dx'ed early, the uterus still grows/stretches and a placenta can migrate away even in 3rd tri. Follow w/ US.
Dr. Brian Nguyen
Dr. Brian Nguyen
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