Gas during pregnancy

By trimester

Weeks 1–13

1st trimester

Gas often shows up early, right alongside other new pregnancy symptoms, as rising progesterone slows your gut down. Smaller meals, eating slowly, and cutting back on carbonated drinks tend to help most in these first weeks.

Weeks 14–27

2nd trimester

Digestion is still running slower than before pregnancy, even as early nausea fades for many people. A short walk after meals and skipping straws, gum, and fizzy drinks (all of which add swallowed air) can ease the pressure.

Weeks 28–birth

3rd trimester

Your growing uterus adds pressure on top of already-slow digestion, so gas can feel more intense now. Loosening your waistband, resting on your left side, and keeping meals modest usually help most. Sudden severe pain or new swelling is not typical gas and deserves a same-day call to your provider.

What does the evidence show for gas?

• Rising progesterone relaxes the smooth muscle in your gut wall, and that single hormone shift is the main reason digestion, including how fast gas moves through you, slows down during pregnancy. 1
• Research measuring digestion speed found that food moves through your gut noticeably slower by the third trimester than it does after delivery, which lines up with why gas and that overly full feeling often peak late in pregnancy. 2
• It's mainly your hormones at work and not just the size of your bump, since slower intestinal movement from pregnancy hormones is what produces both the bloating and the occasional constipation that tend to show up together. 3
• Beans, broccoli-family vegetables, dairy, high-fructose drinks, and sugar-free gum or candy made with sorbitol or xylitol are common gas triggers, so cutting back on just a few of these is often the easiest first step. 4
• Simethicone, the active ingredient in products like Gas-X, works mechanically to break up gas bubbles instead of being absorbed into your bloodstream, and in a study where pregnant women took a simethicone-containing antacid, their newborns showed no unusual effects tied to the medicine. 5
• Abdominal pain concentrated in the upper right side of the belly, especially together with a severe headache, vision changes, or swelling in the face and hands, is a preeclampsia warning sign that goes beyond ordinary digestive discomfort. 6

When should I call my provider about gas?

Ordinary gas is crampy, comes and goes, and tends to ease once you pass gas or have a bowel movement, not pain that is severe, constant, or fixed in one spot. Pain concentrated in the upper right side of your belly, especially alongside a severe headache, vision changes, or new swelling in your face or hands, points toward preeclampsia rather than gas and needs same-day evaluation. Persistent vomiting alongside abdominal pain is also not typical gas and is worth a same-day call to your provider. When in doubt, call your obstetric team the same day. Early input almost always beats waiting, and the on-call line exists exactly for this.