Why reflux happens

A ring of muscle at the bottom of the oesophagus, the lower oesophageal sphincter, normally keeps stomach contents where they belong. Reflux happens when it relaxes inappropriately or when pressure in the abdomen overcomes it.

The oesophagus has no protective lining against acid, so contact causes the burning sensation of heartburn. Occasional reflux is normal. When it is frequent, persistent, or causing complications, it may be evaluated as gastro-oesophageal reflux disease.

  • Raised abdominal pressure — from excess abdominal weight, pregnancy, tight clothing, or large meals.
  • Delayed stomach emptying — large, fatty meals sit longer.
  • Hiatus hernia — part of the stomach moves above the diaphragm, weakening the barrier.
  • Substances that relax the sphincter — including alcohol, nicotine, and some medications.

Symptoms are not always classic heartburn: a chronic cough, hoarseness, a lump-in-throat feeling, or dental erosion can all be reflux-related.

The changes with the best evidence

Not all commonly repeated reflux advice is equally supported. These have the strongest backing.

  • Weight loss — for people with excess weight, this has the most consistent evidence of any lifestyle change, because abdominal weight directly raises pressure.
  • Raise the head of the bed — by 15 to 20 cm using blocks under the bed legs or a wedge under the mattress. Extra pillows bend the neck without raising the torso and often do not help.
  • Avoid eating within about three hours of lying down — late meals are one of the most consistent triggers.
  • Stop smoking — nicotine relaxes the sphincter and reduces protective saliva.
  • Reduce alcohol — it relaxes the sphincter and irritates the lining directly.
  • Smaller meals — large volumes raise pressure and delay emptying.

Trigger foods: individual, not universal

Long lists of forbidden foods circulate widely, but the evidence for blanket elimination is weak. Triggers are genuinely individual, and removing foods that do not affect you narrows your diet for nothing.

Commonly reported triggers worth testing individually include coffee and other caffeinated drinks, chocolate, peppermint, citrus, tomato-based foods, spicy food, carbonated drinks, and high-fat or fried meals. The fat content and total volume of a meal often matter more than any specific ingredient.

  • Keep a two-week log of meals, timing, position, and symptoms.
  • Test one suspected trigger at a time rather than removing everything at once.
  • Note portion size and timing alongside the food; those often explain more.
  • Reintroduce anything that turns out not to be a trigger.

Everyday practical adjustments

Several small changes help, and they compound.

  • Eat more slowly and chew thoroughly; rapid eating swallows more air and encourages larger volumes.
  • Stay upright for two to three hours after eating, and go for a gentle walk rather than lying down.
  • Avoid tight waistbands and belts, which directly raise abdominal pressure.
  • Sleep on your left side if symptoms are worse at night; anatomy makes this position less reflux-prone for many people.
  • Manage stress, which increases symptom perception even when acid exposure is unchanged.
  • Chewing sugar-free gum after meals increases saliva, which helps clear acid — a small but real effect.
  • Ask a pharmacist whether any of your medications contribute; several can.

Medication and when to get assessed

Several categories of medication are used for reflux, including antacids, H2 blockers, and proton pump inhibitors. They work differently and suit different patterns of symptoms. Any decision about starting, combining, or continuing them — including dosing and duration — belongs with a clinician or pharmacist, and long-term use should be reviewed rather than drifting indefinitely.

Some situations need medical assessment rather than self-management.

  • See a clinician if you need medication more than twice a week, if symptoms persist despite lifestyle changes, or if symptoms started after age 50.
  • Seek prompt evaluation for difficulty or pain on swallowing, food sticking, unintended weight loss, persistent vomiting, or anaemia.
  • Seek emergency care for vomiting blood or black tarry stools.
  • Do not assume chest pain is reflux. Reflux and cardiac pain can feel similar. New, severe, or exertional chest pain needs emergency assessment.