What causes heartburn
Heartburn is a burning feeling behind the breastbone caused by stomach acid flowing back into the oesophagus. Normally a ring of muscle, the lower oesophageal sphincter, keeps the stomach contents in place. When it relaxes at the wrong time or the stomach is very full, acid can escape upwards.
Large meals, fatty and spicy foods, alcohol, coffee, chocolate, smoking, being overweight, pregnancy and lying down after eating all make reflux more likely. See foods to avoid with acid reflux.
What milk does in the stomach
- Short-term: cold milk soothes the oesophagus and briefly dilutes acid.
- Fat: relaxes the lower oesophageal sphincter and slows stomach emptying, making reflux more likely.
- Protein and calcium: stimulate the stomach to produce more acid within the next hour or so.
- Overall: relief is usually brief, and full-fat milk can make symptoms worse later.
Which milk and dairy are better tolerated?
Skimmed or semi-skimmed milk contains less fat than whole milk and is better tolerated by some people. Low-fat natural yoghurt is often well tolerated. Rich cheeses, cream, ice cream and milkshakes are common triggers.
Plant-based drinks such as almond or oat milk are lower in fat than whole milk, and some people find them gentler, although evidence is limited. If you notice dairy worsens symptoms, keep a diary and adjust.
What helps heartburn more reliably
- Eat smaller meals and avoid eating within 3 hours of bedtime.
- Identify and limit personal triggers such as alcohol, coffee, chocolate, fatty and spicy foods.
- Stay upright after eating.
- Raise the head of your bed by 10 to 20 cm.
- Lose weight if you are overweight.
- Stop smoking.
- Use pharmacy antacids or alginate medicines for occasional symptoms.
Drinks that are gentler on reflux
- Water, especially sipped after meals.
- Non-mint herbal teas such as camomile or ginger.
- Low-fat milk or plant drinks in small amounts, if they suit you.
- Avoid fizzy drinks, alcohol, strong coffee and citrus juices if they trigger symptoms.
Peppermint tea can relax the sphincter and worsen reflux in some people.
How long does acid reflux last?
An episode of heartburn usually lasts from a few minutes to a few hours. It often comes after a large meal, when bending over or when lying down. Antacids work within minutes, while medicines that reduce acid production take longer but last longer.
Heartburn on more than 2 days a week, or that keeps returning despite lifestyle changes, may be gastro-oesophageal reflux disease (GORD) and is worth discussing with a doctor.
Heartburn in pregnancy
Heartburn is very common in pregnancy because of hormonal changes and pressure from the growing baby. Small, frequent meals, avoiding late eating and sleeping propped up help. Some antacids are suitable in pregnancy; ask a pharmacist or midwife. Milk in moderation is fine as part of a balanced diet but is not a reliable treatment.
Night-time heartburn
Heartburn at night is common because lying flat lets acid flow back more easily. A glass of milk at bedtime is unlikely to help and may make it worse. Finish eating 3 hours before bed, raise the head of the bed and try sleeping on your left side, which reduces reflux for many people.
Medicines for heartburn
- Antacids: neutralise acid quickly for occasional symptoms.
- Alginates: form a protective layer on top of the stomach contents, useful after meals and at night.
- Acid-reducing medicines: such as proton pump inhibitors, for frequent symptoms, ideally after talking to a pharmacist or doctor.
- Some medicines, such as anti-inflammatories, can worsen heartburn; ask a pharmacist.
When to see a doctor
- Difficulty or pain when swallowing, or food sticking.
- Vomiting, vomiting blood or black stools.
- Unexplained weight loss.
- Heartburn most days for 3 weeks or more, or new symptoms after age 55.
- Chest pain with breathlessness, sweating or pain spreading to the arm or jaw: call emergency services.
Key points to remember
- Milk may soothe heartburn briefly, but fat and protein can increase acid later.
- Low-fat options are better tolerated by some people.
- Smaller meals, avoiding late eating and trigger foods help more reliably.
- Frequent or severe heartburn needs medical advice.
Questions about milk and heartburn
These answers are general information and do not replace an examination or individual medical advice.
Does milk neutralise stomach acid?
Only briefly. It can then stimulate more acid production.
Is cold milk good for acid reflux?
It may soothe for a short time, but it is not a reliable treatment and full-fat milk can worsen symptoms later.
Is yoghurt good for heartburn?
Low-fat natural yoghurt is often well tolerated, but individual responses vary.
What drink stops heartburn fast?
Water helps rinse acid down. Pharmacy antacids work fastest for relief.
How long does acid reflux last?
An episode usually lasts minutes to a few hours.
Is almond milk better for heartburn?
It is lower in fat than whole milk and some people find it gentler, though evidence is limited.
Does milk help heartburn in pregnancy?
It may soothe briefly, but small meals, not eating late and sleeping propped up work better. Ask a pharmacist about suitable antacids.
Sources
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.