Heartburn During Pregnancy: Diet Changes That Actually Help

Heartburn affects a large majority of women at some point in pregnancy, and for many it becomes a near-daily companion in the second and third trimesters. It’s uncomfortable rather than dangerous, but a handful of dietary adjustments can meaningfully reduce how often and how badly it strikes.

Why Pregnancy Causes Heartburn

Two separate mechanisms combine to make heartburn so common in pregnancy. First, the hormone progesterone relaxes smooth muscle throughout the body, including the valve between your oesophagus and stomach (the lower oesophageal sphincter), making it easier for stomach acid to travel back upwards. Second, as your baby and uterus grow, particularly in the third trimester, physical pressure on your stomach increases, which can push acid upward more easily. This is why heartburn typically gets worse as pregnancy progresses rather than improving.

Meal Size and Timing

This is the single most effective lever for most women:

• Eat smaller, more frequent meals rather than three large ones — a full stomach has more acid and more pressure pushing upward.
• Avoid eating within 2-3 hours of lying down, including going to bed — lying flat with a full stomach makes reflux much more likely.
• Eat slowly — eating quickly tends to mean swallowing more air and overfilling the stomach before your body registers fullness.

Foods and Drinks That Commonly Trigger Heartburn

These vary between individuals, but the most commonly reported triggers are:

• Spicy food
• Citrus fruits and juices
• Tomato-based dishes (sauces, ketchup)
• Caffeine (tea, coffee, cola)
• Carbonated drinks
• Fatty or fried food
• Chocolate
• Mint, including peppermint tea (this one surprises people, since mint is often assumed to be soothing)

Keeping a brief note of what you ate before a bad episode over a week or two often reveals your own personal triggers, since not everyone reacts to the same foods.

Sleeping Position

Propping yourself up with extra pillows, or using a wedge pillow to keep your upper body elevated, reduces how easily acid travels upward while lying down. Sleeping on your left side (which is generally recommended in later pregnancy anyway) is also thought to reduce reflux compared to the right side, due to stomach anatomy.

When Diet Changes Aren’t Enough

If dietary and lifestyle changes don’t provide enough relief, several antacids and other heartburn medications are considered safe in pregnancy — but check with your midwife, GP, or pharmacist before taking anything, including over-the-counter remedies, since not every product is appropriate throughout all of pregnancy.

When to Get Medical Advice

Ordinary pregnancy heartburn is uncomfortable but not a warning sign. Contact your midwife or GP if you experience severe or persistent pain, difficulty swallowing, vomiting, or if it’s affecting your ability to eat and drink normally — these can occasionally indicate something beyond typical reflux worth checking.