# Heartburn During Pregnancy in the third trimester

Source: https://www.pregnancypowerhour.com/trimester-conditions/heartburn-in-third-trimester
Last updated: 2026-07-15

> Third-trimester heartburn often intensifies as your growing baby crowds your diaphragm, making nighttime discomfort especially common.

Heartburn, or acid reflux, can be a familiar companion throughout pregnancy, but it often takes on a new intensity as you move into your third trimester. It's a common experience, and understanding why it might feel different now can bring a sense of clarity.

## Why it shows up this trimester
As your baby continues to grow and descend, the uterus expands significantly, putting increased pressure on your stomach and diaphragm. This physical crowding can push stomach acid back up into your esophagus more easily. Additionally, the hormone progesterone, which relaxes smooth muscles throughout your body to support pregnancy, continues to keep the esophageal sphincter (the valve between your esophagus and stomach) more relaxed. This combination of mechanical pressure and hormonal influence often means heartburn can feel more pronounced and frequent in these later weeks.

## What it tends to feel like now
In the third trimester, you might notice the familiar burning sensation in your chest or throat, but it can also manifest as a persistent cough, a sour taste in your mouth, or even a feeling of food coming back up. Many parents find it's particularly bothersome at night, making it challenging to find a comfortable sleeping position. The sensation might feel more intense after meals, especially larger ones, or when bending over. It's a distinct feeling that can sometimes be mistaken for other discomforts, so tuning into your body's signals is key.

## What helps in this window
Finding comfort in the third trimester often involves gentle adjustments. One option might be to eat smaller, more frequent meals throughout the day, rather than three large ones, to reduce the amount of food in your stomach at any given time. Giving your body a few hours between your last meal and bedtime can also be helpful. Elevating your head and upper body slightly with pillows while sleeping can use gravity to your advantage. Some people find relief by avoiding trigger foods like spicy dishes, citrus, chocolate, or high-fat foods, especially in the evening. Staying hydrated between meals, rather than with them, can also be a supportive practice. Remember, you get to decide what feels right for your body.

## Working with your care team
While these suggestions can offer some ease, it's always valuable to discuss persistent or severe heartburn with your care provider. They can help rule out other conditions and offer personalized recommendations, including over-the-counter antacids that are generally considered safe during pregnancy. Your OB or midwife is your best resource for your specific situation, ensuring any approach you take is aligned with your overall health plan. Collaborating with them can bring you peace of mind and help you navigate this common third-trimester experience with confidence.