Pregnancy Heartburn Relief: Safe Remedies & What to Avoid

Heartburn affects up to 80% of pregnancies at some point — and for many, it becomes daily and unrelenting from the third trimester. The burning sensation behind the breastbone, the sour taste at the back of the throat, the night-time waking — pregnancy turns ordinary meals into a battle. The good news: heartburn is harmless to your baby and almost always disappears within hours of giving birth. The better news: there's a lot you can do to make it bearable.

This guide covers exactly why pregnancy heartburn is so persistent, the food and habit changes that actually help, which over-the-counter antacids are pregnancy-safe (and which to avoid), and the warning signs that mean something more serious might be going on.

Why heartburn is so much worse during pregnancy

Two pregnancy-specific things are working against you:

1. Progesterone relaxes the valve at the top of your stomach

The lower oesophageal sphincter (LES) is a ring of muscle that normally stops stomach acid travelling back up. During pregnancy, progesterone — the hormone that protects the pregnancy — also relaxes smooth muscle throughout the body, including the LES. The valve doesn't close fully, and acid escapes upward.

2. Your uterus is pressing on your stomach

From the second half of pregnancy, the uterus pushes the stomach up under the ribs. The stomach is being squeezed — there's less room for food, and any acid sitting on top has nowhere to go but back up the oesophagus. This is why heartburn typically peaks around weeks 27–34.

Both factors compound each other. Some women have heartburn from week 6; others sail through T1 and T2 only to be hit hard in T3. Both are normal.

What works — diet and eating habits

Foods that commonly trigger heartburn

Trigger foods vary by person — keep a food diary for a week to spot your own. The most common offenders:

• Spicy foods — chillies, curries, hot sauces
• Fatty and fried foods — chips, fried chicken, creamy sauces, pastries
• Citrus — orange juice, grapefruit, lemons, tomatoes and tomato sauce
• Caffeine — coffee, strong tea, cola, dark chocolate
• Carbonated drinks — sparkling water, fizzy drinks (gas pushes acid up)
• Onions and garlic (especially raw)
• Mint — ironically, peppermint relaxes the LES and makes heartburn worse
• Vinegar and pickled foods
• Very cold or very hot drinks
• Alcohol — already not recommended in pregnancy

Foods that often help

• Plain Greek yogurt — coats the oesophagus, provides calcium
• Bananas — neutralise acid, gentle on the stomach
• Oatmeal — absorbs acid, slow-release energy
• Almonds — small handful chewed thoroughly
• Ginger tea (mild, not strong) — calms the stomach, also helps morning sickness
• Cold milk — short-term relief; long-term effect is mixed
• Wholegrain bread or crackers — sometimes good first thing in the morning
• Leafy green vegetables, melon, pears — generally well tolerated

For full pregnancy-nutrition guidance, see our safe foods guide.

Sleeping with heartburn

Lying flat is the worst position — gravity is no longer keeping acid in your stomach. The fixes:

• Don't eat for 2–3 hours before bed. If you wake up hungry, a small snack of yogurt, banana or a few crackers is usually fine.
• Sleep on your left side. The stomach sits to the left of the oesophagus — left-side sleep keeps acid pooled at the bottom rather than at the LES.
• Raise the head of your bed 15–20cm. Two pillows under the shoulders is the cheap version. A wedge pillow under the mattress works better. Stacking pillows under the head alone often makes it worse (kinks the spine without raising the chest).
• Loose nightwear — no tight waistbands.

For full sleep-position guidance, see our pregnancy sleep positions guide.

Pregnancy-safe antacids

Most women need some pharmaceutical help by the third trimester — diet alone often isn't enough. The good news: many heartburn medications have decades of pregnancy safety data.

First-line — over the counter

How to take them well: after meals and at bedtime. Don't take antacids at the same time as iron supplements (they reduce iron absorption — separate by 2 hours). Read your prenatal supplement guide for timing.

Use with caution

• Sodium bicarbonate antacids (e.g. some Alka-Seltzer formulas) — high salt content; avoid in pregnancy.
• Aluminium-only antacids in large amounts — can cause constipation and may interact with calcium absorption. Small occasional doses are fine.

Prescription options if antacids aren't enough

• Omeprazole, lansoprazole (proton-pump inhibitors / PPIs) — good safety record in pregnancy. Available on prescription, usually for severe daily reflux.
• Famotidine, ranitidine alternatives (H2 blockers) — also well-studied in pregnancy. Often used at night when daytime antacids aren't holding through to morning.

If you're using antacids more than 2–3 times a day for several weeks, ask your GP or midwife about a stronger option — there's no medal for suffering through.

What to avoid

• Bicarbonate of soda as a homemade remedy — high sodium load, can cause swelling and blood pressure issues
• Apple cider vinegar — popular online but can worsen reflux and erodes tooth enamel
• Peppermint, fennel and spearmint as anti-heartburn remedies — mint relaxes the LES and worsens reflux
• Lying down or napping right after meals
• Smoking and alcohol — already off-limits but worth mentioning, both worsen reflux
• Tight clothing around the waist
• Bending forward (e.g. to pick things up from the floor) — squat instead

Old wives' tales — what's true?

"Heartburn means a hairy baby"

A 2006 Johns Hopkins study did find a weak association between severe heartburn and a hairier newborn — both linked to higher oestrogen levels. But it is not predictive, and most women with heartburn deliver babies with a normal amount of hair. Don't take this as a guarantee either way.

"Drink milk before bed"

Cold milk gives short-term relief by neutralising acid. But the fat in whole milk can stimulate more acid production an hour later. If you try it, use skimmed or semi-skimmed.

"Sit-ups will help digestion"

No — exercise after meals (other than gentle walking) makes reflux worse.

When to call your midwife or doctor

• Severe pain in the upper-right abdomen (under the ribs) — could be pre-eclampsia or HELLP, not heartburn
• Sudden severe headache + vision changes + heartburn in late pregnancy — possible pre-eclampsia
• Pain on swallowing or food sticking in your throat
• Vomiting blood or passing black, tarry stools
• Unintentional weight loss
• Heartburn unresponsive to antacids for more than a week
• Heartburn waking you every night
• Severe nausea returning in T3 — rule out HELLP / pre-eclampsia

FAQ — Pregnancy heartburn

Pregnancy heartburn — at a glance

Heartburn during pregnancy is caused by progesterone relaxing the LES valve plus the uterus pressing up on the stomach. It is harmless to the baby but can be miserable for you. The fixes are straightforward: small frequent meals, no eating in the 2–3 hours before bed, sleep propped up on your left side, identify and skip your triggers, and use pregnancy-safe antacids (Tums, Rennie, Gaviscon) when you need them. If antacids aren't enough, omeprazole and famotidine are safe and commonly prescribed. Call your midwife if pain shifts to the upper-right abdomen or comes with vision changes — those signal something more serious. Most heartburn vanishes within days of giving birth.