# Heartburn During Pregnancy in the second trimester

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

> In the second trimester, heartburn often begins or increases as your growing uterus starts to push upward, making gentle adjustments to positioning and diet especially helpful.

Heartburn, or acid reflux, is a common experience for many during pregnancy, and it often becomes more noticeable as you move into your second trimester. It's a sensation that can feel like a burning discomfort in your chest, sometimes extending up towards your throat. While it's certainly not comfortable, understanding why it happens and what might offer some ease can bring a sense of calm and clarity.

## Why it shows up this trimester

There are a couple of key reasons why heartburn might start or intensify during weeks 14-27. Firstly, hormonal changes, particularly the increase in progesterone, cause the smooth muscles in your body to relax. This includes the esophageal sphincter, the valve that normally keeps stomach acid from flowing back up into your esophagus. When this valve relaxes, it's easier for acid to make its way up. Secondly, and increasingly significant in the second trimester, your uterus is growing steadily. This expansion starts to put physical pressure on your stomach, which can also encourage acid to move upward. Digestion can also slow down a bit during pregnancy, giving your body more time to absorb nutrients, but also potentially contributing to reflux.

## What it tends to feel like now

The sensation of heartburn in the second trimester is typically that familiar burning feeling behind your breastbone. You might notice it more frequently, especially after meals or when you lie down. Some people describe a sour taste in their mouth, or even a small amount of regurgitation. It can range from a mild annoyance to a more persistent discomfort, and it's something many pregnant people navigate. Remembering that this is a common physiological shift can sometimes help reduce the anxiety around it.

## What helps in this window

There are several practical, gentle approaches you might explore to find some relief. One option might be to eat smaller, more frequent meals throughout the day, rather than three large ones. This can prevent your stomach from becoming overly full. Paying attention to foods that seem to trigger your heartburn – often spicy, fatty, acidic, or caffeinated items – and adjusting your diet accordingly can be helpful. Staying upright for at least an hour or two after eating can use gravity to your advantage. Many find elevating their head slightly while sleeping, perhaps with an extra pillow or a wedge, can make a difference. Loose-fitting clothing around your abdomen can also prevent additional pressure.

## Working with your care team

While these gentle approaches can offer relief, it's always a good idea to discuss any persistent or severe heartburn with your OB or midwife. They are your best resource for your specific situation and can offer evidence-based guidance on over-the-counter options or prescription medications if your symptoms are significantly impacting your comfort or sleep. You get to decide what feels right for your body, and your care team can help you make informed decisions about your options, ensuring any interventions are safe for you and your baby. As a birth doula, what I often tell clients is that clarity and open communication with your provider can make a big difference in feeling confident and supported.