Acid Reflux: It's About Signals, Not Too Much Acid
What is acid reflux?
Acid reflux is when acid and other contents from the stomach flow back up into the oesophagus, the tube that carries food from your mouth to your stomach. Normally this is prevented by a ring of muscle at the bottom of the oesophagus, called the lower oesophageal sphincter, which works like a one-way valve. It opens to let food into the stomach, then closes tightly to keep acid in. Reflux happens when this valve relaxes or opens when it shouldn't. The stomach has a strong protective lining that can handle acid, but the oesophagus doesn't, so the acid irritates it.
The most common sign is heartburn, a burning feeling in the chest, often after eating or when lying down. Other signs include a sour or bitter taste in the mouth, bringing food or liquid back up, bloating, burping, feeling sick, a cough or hoarse voice, and a feeling of something stuck in the throat.
Most people get reflux now and then. When it happens often, usually twice a week or more, it's called GERD (gastro-oesophageal reflux disease). Over time, frequent reflux can inflame and damage the lining of the oesophagus, so it's worth getting to the root of it.
Reflux is often about signals, not too much acid
So why does the valve open when it shouldn't? Basically acid reflux is about signals, not too much acid. For many people, it isn't because the valve is damaged. The valve itself is usually healthy and strong enough to do its job. The problem is that it's getting mixed signals. It relies on messages from nerves, hormones, pressure inside the stomach and the level of acid to know when to open and when to stay shut. When those messages are off, it can relax at the wrong moment — often after a meal, when lying down or when the stomach is too full, and let acid escape upwards.
There are cases where the structure itself is the problem, such as a hiatus hernia, where part of the stomach pushes up through the diaphragm. But in many people, reflux is a problem of how the stomach works rather than how it's built. This matters, because it changes the goal. Acid-reducing medicines can ease the burning, but they don't change why the valve is relaxing in the first place. If you can find what's disrupting those signals and correct it, the valve can often start doing its job properly again.
How the stomach should work
The stomach is a coordinated system run by nerve and chemical signals, pressure and acidity. Two valves (rings of muscle called sphincters) do most of the work:
The lower oesophageal sphincter sits where the food pipe meets the stomach. It should stay closed after food passes through, so acid can't come back up.
The pyloric sphincter at the bottom of the stomach lets food into the small intestine once it's ready.
Strong stomach acid is normal and useful. It kills germs in food, starts breaking down protein and helps food move on at the right time.
When digestion is slow or incomplete, food stays in the stomach longer. Pressure builds and pushes upwards, the top valve relaxes, and acid escapes into the food pipe. So reflux is often less about too much acid and more about acid in the wrong place at the wrong time because of poor digestion.
Three common drivers
If reflux is usually a signalling problem, the next question is what's disrupting those signals. Reflux is rarely caused by one thing. It's more often the result of several factors building up over time, wearing down the stomach lining, slowing digestion and confusing the messages that tell the valve what to do. These factors tend to fall into three groups: things that harm the body (toxins), an imbalance of bugs in the gut (microbes), and missing building blocks the body needs to work properly (deficiencies).
Toxins. Alcohol, smoking, anti-inflammatory painkillers such as ibuprofen, ultra-processed food and damp or mould at home can irritate the stomach lining, weaken its protective layer and upset signalling. Ongoing stress also changes how quickly the gut moves.
Microbes. An imbalance of gut bacteria or yeasts, too many bacteria in the small intestine (SIBO) and the stomach bacterium H. pylori can all play a part. When microbes ferment food, they make gas, which raises pressure in the stomach and pushes its contents upwards.
Deficiencies. The body needs zinc and salt to make stomach acid, plus B vitamins and other nutrients. Poor sleep and weak signals from the vagus nerve (which links the brain and gut) can slow digestion. So can poor bile flow: bile helps digest fat, and without enough of it the stomach may empty more slowly.
Most people have a mix of all three.
Finding the cause and supporting healing
a detailed health history helps show what has built up over time — from birth and childhood illnesses to antibiotic use, stress and diet. Testing, such as checking for H. pylori, gut microbes or nutrient levels, can confirm what's going on.
Healing usually works best in stages:
Clear the way. Keep the bowels moving with real food and water, and stay active.
Remove what's causing harm, such as irritating foods, unnecessary painkillers, damp at home and avoidable stress.
Replenish with nutrient-rich whole foods, and correct low levels of vitamin D, zinc or omega-3s.
Repair the stomach lining with soothing herbs like DGL (a form of liquorice), slippery elm and aloe, and support gut bacteria with real food and probiotics. If you react to histamine, some "gut-healing" foods such as bone broth may need to wait.
Rebalance with regular sleep, gaps between meals and time to rest and relax.
Progress isn't always a straight line. Some steps may need repeating, and skipping them can lead to symptoms coming back.
Take care with stomach acid (HCl) supplements: they can harm a damaged stomach lining, especially if you've had ulcers or H. pylori, so check with a practitioner first. If you have high blood pressure, speak to your doctor before eating more salt.
How a naturopath can help
Because reflux usually has more than one cause, it can be hard to work out on your own what's driving it. As a naturopath specialising in digestive health, including conditions like acid reflux, I will take time to go through your full health history, diet, lifestyle and stress levels, and arrange functional tests, such as gut microbiome or testing, to fill in the picture. From there, I will put together a personal plan using food changes, herbal medicine and targeted supplements, and adjust it as you progress. I can also help you take each step in the right order, so nothing important gets missed, and work alongside your GP where needed.
