Bleeding gums during pregnancy (pregnancy gingivitis)

By trimester

Weeks 1–13

1st trimester

Pregnancy gingivitis can start as early as the first trimester as hormone levels begin rising, though it's often mild enough that many people don't notice it yet. Starting or keeping up a solid brushing and flossing routine now helps limit how much it progresses later.

Weeks 14–27

2nd trimester

Bleeding and gum swelling typically become more noticeable in the second trimester as progesterone and estrogen keep climbing. A dental cleaning at this stage is generally well timed and can help keep inflammation in check.

Weeks 28–birth

3rd trimester

Gum inflammation usually peaks in the third trimester, when pregnancy hormone levels are at their highest. Keep up regular brushing, flossing, and any recommended dental visits, since the swelling and bleeding typically resolve on their own within a few months after delivery.

What does the evidence show for bleeding gums?

• Pregnancy gingivitis is extremely common, affecting an estimated 30% to 100% of pregnant people depending on the population studied, and shows up as red, swollen gums that bleed easily with brushing or flossing. 1
• Rising progesterone and estrogen during pregnancy, which peak at roughly 10 and 30 times typical menstrual-cycle levels by the third trimester, increase blood flow and swelling in gum tissue and make it react more strongly to the plaque that's already there. 1
• Pregnancy gingivitis tends to start in the first trimester, becomes more noticeable in the second, and peaks in the third trimester, then eases within a few months after delivery without causing lasting attachment loss. 2
• More advanced gum disease (periodontitis) has been linked to higher odds of preterm delivery, low birth weight, preeclampsia, and gestational diabetes, though the strength of that link varies between studies and researchers say the evidence isn't yet conclusive. 3
• One proposed mechanism is that bacteria from infected gum tissue can travel through the bloodstream to the placenta and trigger an inflammatory response there; about a third of placenta samples studied have been found to harbor bacteria, more often in preterm deliveries. 4

When should I call my provider about bleeding gums?

Ordinary pregnancy gingivitis causes gum swelling and bleeding with brushing, but it doesn't cause a receding gumline, loose teeth, pus, or a lump on the gums, and those signs are worth a dental visit rather than more brushing. More advanced gum disease that goes unaddressed has been linked in research to higher odds of preterm delivery, low birth weight, and preeclampsia, so gums that stay inflamed despite good home care are worth flagging to both your dentist and your prenatal provider. Whatever the pattern, any symptom that feels beyond your usual range is a reason to call: obstetric teams expect these questions and would rather hear early than late.