What’s actually happening in your gut when you get indigestion?

Indigestion is often described medically as functional dyspepsia — meaning there’s no single visible cause, but the way your stomach empties and moves food becomes disrupted. This can show up as postprandial distress (discomfort after eating), epigastric pain in the upper stomach area, bloating, early satiety (feeling full too quickly), or belching. Some people also regurgitate small amounts of food or acid, or notice their stomach distend and delay emptying — in rarer cases this can be caused by gastroparesis, a more lasting motility problem — while food that isn’t broken down properly can ferment in the gut.

How is indigestion linked to acid reflux and GORD?

Indigestion and heartburn are closely linked to acid reflux, and reflux-related symptoms can sometimes point to GORD (gastro-oesophageal reflux disease). This acid-induced irritation can range from acute, one-off episodes to more chronic or recurrent patterns. Some people have non-erosive reflux disease, where the lining looks normal despite symptoms, while others develop erosive or ulcerating changes — peptic damage that a clinician can identify. When symptoms don’t respond to standard treatment, this is known as refractory indigestion and may need further investigation.

What if indigestion doesn’t improve, or keeps coming back?

If tests show a Helicobacter pylori infection, your clinician may prescribe antibiotics to eradicate H. pylori, since this can otherwise exacerbate symptoms long-term. Sometimes no clear cause is found even after doctors diagnose and investigate further — this is described as idiopathic or functional indigestion. In these cases, treatment tends to be symptom-related, focusing on managing what you’re experiencing rather than a single underlying cause.

Indigestion (Dyspepsia): Symptoms, Causes & Relief

What is indigestion?

Indigestion is a common uncomfortable feeling in your upper tummy, often caused by lifestyle triggers or mild gut issues. You can usually manage symptoms at home by adjusting your diet and trying over-the-counter remedies. However, if your pain is severe, lasts longer than a week, or comes with red flag symptoms like weight loss, you should consult a doctor for a professional assessment.

Many people experience the uncomfortable feeling of indigestion after eating. You might notice a burning sensation, a heavy feeling of bloating, or sharp pain in your upper stomach. These symptoms can be distressing and disrupt your daily routine. While indigestion is very common and usually not a sign of anything serious, understanding your personal triggers is the first step to feeling better. Getting to the root of the problem allows you to find reliable relief and safely rule out any underlying issues.

What does indigestion feel like?

Indigestion, known medically as dyspepsia, is a general term for pain or discomfort in the upper abdomen. It is not a specific disease, but rather a descriptive symptom arising from an irritation or problem in your upper gut, typically causing an aching or burning sensation soon after eating or drinking.

The medical definition of dyspepsia

The NHS states that indigestion is an extremely common issue that affects most people at some point, is usually not serious, and can often be managed with simple lifestyle changes or pharmacy medicines. While 'indigestion' is the everyday phrase, doctors use the clinical term 'dyspepsia' to describe this specific cluster of upper digestive symptoms.

Close-up of a man's hand resting on his chest over a checked shirt

The four main symptoms of indigestion

When you have a bout of indigestion, you will typically experience one or more of the following main symptoms, usually soon after eating or drinking:

Pain, an aching sensation, or a burning feeling focused in the upper stomach area.
Feeling uncomfortably heavy or overly full during or immediately after a meal, even if you have not eaten very much.
Bloating, which often feels like painful trapped wind expanding in your upper belly.
Nausea (feeling sick to your stomach), excessive belching, or bringing up food.

Man holding both hands on his stomach, seated outdoors

Indigestion vs heartburn: what is the difference?

The main difference between indigestion and heartburn is the location and sensation: indigestion causes a heavy ache in the upper stomach, while heartburn causes a hot, burning feeling in the chest. It is very easy to confuse indigestion and heartburn because they happen in a similar area of the body and share common food triggers.

Understanding heartburn and GORD

Heartburn is specifically a burning sensation felt in the centre of your chest, often behind the breastbone. It is caused by strong stomach acid escaping the stomach and travelling upwards towards your throat. This process is known clinically as acid reflux. If you experience acid reflux regularly and it begins to impact your quality of life, it is diagnosed as gastro-oesophageal reflux disease, or GORD. The NICE guidance covers the clinical investigation and management of both dyspepsia and GORD in adults, as the two conditions are closely linked and often treated using similar approaches.

Key differences in symptoms and location

The main difference between the two conditions is the exact location of the discomfort and the type of sensation you feel. Indigestion is felt lower down, strictly in the upper stomach area, and feels more like a heavy ache or fullness. Heartburn is felt higher up in the chest and throat, and has a distinct hot, burning quality.

It is very possible to experience both conditions at the exact same time. In fact, indigestion can frequently be a presenting symptom of GORD. Understanding the differences can help you pinpoint which issue is causing your discomfort.

Feature	Indigestion (dyspepsia)	Heartburn (acid reflux)
Sensation	Pain, uncomfortable fullness, or bloating.	A hot, burning feeling.
Location	Upper abdomen (tummy).	Chest, moving up towards the throat.
Common Cause	Various food triggers, eating habits, or gut irritation.	Stomach acid escaping into the oesophagus.

The most common causes and triggers of indigestion

The most common causes of indigestion include eating rich or spicy foods, consuming caffeine or alcohol, feeling highly stressed, and taking certain stomach-irritating medications. Finding out why you keep getting indigestion involves looking closely at your daily habits, your diet, and your medical history.

Lifestyle and dietary triggers

What you choose to eat and how you eat it plays a massive role in your daily digestion. Certain foods are much harder for your stomach to break down. Common food and drink triggers include rich, fatty, greasy or very spicy foods, along with consuming too much caffeine, alcohol, or fizzy drinks.

Your daily eating behaviours matter just as much as the ingredients on your plate. Eating your meals too quickly forces your stomach to work much harder. Having very large meals stretches the stomach, which can cause pain. Lying down flat on the sofa or bed immediately after eating, and smoking cigarettes, can also directly provoke uncomfortable symptoms.

Medical conditions that cause dyspepsia

If your indigestion is persistent and happens most days, it can sometimes point to an underlying medical issue in the upper gut. Common conditions include GORD, stomach ulcers (often called peptic ulcers), and a hiatus hernia, where part of the stomach pushes up into the chest cavity. Another frequent cause is gastritis, which occurs when the protective lining of the stomach becomes irritated and inflamed. The NHS notes that gastritis can cause pain, indigestion, feeling full and bloated, and feeling sick.

Medications that can irritate the stomach

Certain prescription and over-the-counter medicines are well-known for irritating the stomach lining. Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, naproxen and aspirin are some of the most common culprits. Some antibiotics and steroid medications can also cause sudden gastric flare-ups. You should always read the patient information leaflet that comes with your medicine box to check for digestive side effects. Speak to a GP or pharmacist if you suspect your daily prescription is causing your stomach pain.

The link between stress, anxiety and your gut

Your brain and your gut are constantly communicating with each other through a complex network of nerves known as the gut-brain axis. When you feel highly stressed or anxious, your body releases fight-or-flight stress hormones. These powerful hormones can significantly increase your stomach acid production and slow down your normal, rhythmic digestion process.

This biological link is exactly why your indigestion symptoms can suddenly flare up during a stressful period at work or a difficult time at home, even if you have not made any changes to your normal diet.

How to relieve indigestion at home

You can relieve indigestion at home by eating smaller meals, avoiding known trigger foods, sitting firmly upright after eating, and taking over-the-counter antacids. You can often ease mild indigestion with a few simple steps and targeted dietary choices.

Quick tips for immediate relief

When indigestion symptoms strike suddenly, taking prompt action can help settle your stomach quickly. Try these simple, practical steps to find relief:

Stop eating or drinking whatever might be causing the flare-up.

Sit firmly upright in a chair to take physical pressure off your stomach and allow gravity to help digestion.

Loosen any tight clothing, belts or waistbands around your middle.

Sip a little plain, still water slowly to help wash stomach acid back down.

Long-term lifestyle changes to prevent flare-ups

Making small, sustainable daily adjustments can make a very big difference to your long-term gut health. To help patients manage their symptoms effectively, NICE guidance states that adults with dyspepsia should receive self-management advice.

DO:

Eat smaller, more frequent meals rather than three very large ones.
Identify your personal trigger foods by keeping a symptom diary, and avoid them.
Raise the head of your bed slightly with blocks if your symptoms are much worse at night.
Try to lose excess weight to reduce the physical pressure placed on your stomach.

DON'T:

Eat heavy meals within three to four hours of going to sleep.
Smoke cigarettes or drink excessive amounts of alcohol.
Rush your meals, chew poorly, or eat while highly distracted.

Helpful foods to eat and trigger foods to avoid

Tailoring your daily diet is one of the single most effective ways to manage dyspepsia and prevent painful flare-ups.

Common trigger foods to limit	Gut-friendly foods to try
Tomatoes and tomato-based sauces	Fresh ginger (in tea or meals)
Citrus fruits (oranges, lemons)	Oatmeal and porridge
Fatty, fried or processed meats	Bananas and melons
Raw onions and garlic	Lean poultry and baked fish
Coffee and caffeinated tea	Fennel and non-caffeinated herbal teas

When to see a doctor for your indigestion

You should see a doctor for your indigestion if your symptoms are persistent, severe, fail to improve with home remedies, or last longer than one week. While indigestion is rarely an emergency, some symptoms mean you need a professional medical assessment to rule out serious conditions.

When to book a routine GP appointment

You should see a GP if your indigestion symptoms are persistent, severe, or beginning to impact your daily life. The NHS advises seeking medical help if you have tummy pain or indigestion for longer than one week.

You should also book a routine appointment if self-care measures are not working, if you are aged over 55 and have suddenly developed new indigestion symptoms, or if you suspect your daily prescription medication is to blame. Our online GPs can carefully assess your symptoms via a video appointment and advise on the safest next steps for your care.

What are the red flag symptoms for indigestion?

Some specific symptoms require urgent medical attention to rule out serious underlying problems, such as bleeding or blockages in the gut.

When to get urgent help

Call 999 or go to A&E if: you vomit blood or vomit that looks like ground coffee, or if you pass black, tarry stools.
See a GP urgently if: you have unexplained weight loss, difficulty swallowing, food feeling stuck, persistent vomiting, or severe and unyielding tummy pain.

How a GP investigates and treats persistent indigestion

A GP investigates persistent indigestion by asking about your symptoms and lifestyle, and may arrange tests like an H. pylori check or an endoscopy to recommend treatments such as acid-suppressing medication. If you need to see a doctor for your indigestion, they will focus on finding the root cause of your discomfort so they can recommend the most appropriate treatment.

What happens during your consultation

Your doctor will ask detailed questions about your symptoms, your lifestyle habits, and your wider medical history. They will want to know exactly when the pain starts, how long it usually lasts, and what makes it better or worse. Keeping a simple food and symptom diary for a few days before your appointment is incredibly helpful for this conversation.

Tests your doctor may arrange

Based on NICE guidance, your GP may suggest further investigation to pinpoint the problem.

H. pylori test: This is a simple, routine stool test. It specifically checks for a common bacterial infection in the stomach lining that is known to cause ulcers and ongoing dyspepsia.
Endoscopy: This is a hospital procedure where a thin, flexible camera tube is passed down your throat to look directly inside your stomach. It is usually reserved for people presenting with red flag symptoms, or if standard medical treatments have not worked as expected.

Medical treatments for indigestion

There are several highly effective medications available to soothe the stomach, both from local pharmacies and on prescription.

Over-the-counter medicines: Antacids help to quickly neutralise existing stomach acid. Alginates form a protective foam barrier over your stomach contents to prevent irritation. The NHS confirms that common medicines like Gaviscon treat heartburn and indigestion by helping reduce stomach acid.
Prescription medication: If pharmacy remedies are not strong enough, your GP might prescribe daily acid-suppressing medicines. These include Proton Pump Inhibitors (PPIs) and H2 blockers, which are widely recommended by NICE for treating persistent dyspepsia and allowing the gut to heal.

Getting the right help for your indigestion

Getting the right help for your indigestion involves tracking your triggers in a symptom diary and consulting a doctor if your discomfort is persistent, severe, or accompanied by red flag signs. Indigestion is incredibly common and often easily manageable from home. Identifying your personal food and lifestyle triggers is the best first step. However, persistent symptoms or any red flag signs always need a thorough medical assessment. Effective treatments are readily available if lifestyle changes are not enough to bring you relief.

Take control of your gut health today by starting a simple symptom diary. Track what you eat, when you feel stressed, and when the pain strikes. If you are worried or your symptoms are not improving, do not hesitate to seek professional advice.

Book an appointment with a Doctor Care Anywhere GP for a convenient and reassuring consultation. Our online GPs can assess your symptoms, help you understand your triggers, and prescribe the right treatment to settle your stomach.

Dyspepsia does often go away completely, especially when it is linked to diet or a temporary lifestyle factor that resolves quickly with basic self-care. However, when your indigestion is caused by an underlying medical condition like GORD or an H. pylori infection, it may become recurrent or chronic. In these instances, you usually require a targeted medical treatment plan to settle your stomach for good.

Several other conditions can feel like indigestion but are actually different issues. Heartburn causes burning chest pain, while gallstones often cause severe pain on the right side of your tummy. In rare cases, heart problems like angina can present as a heavy discomfort in the upper stomach or chest. Because of this, unexplained chest pain should always be evaluated by a doctor immediately.

Indigestion often gets worse at night because when you lie down flat, gravity no longer helps keep stomach acid in its proper place. This makes it far easier for acid to travel up into your oesophagus. Your digestion also naturally slows down overnight. This biological combination explains why both indigestion and acid reflux symptoms frequently flare up when you are trying to sleep.

Dyspepsia pain is felt exactly in the upper part of your abdomen. A local NHS service describes this uncomfortable sensation as pain and sometimes other symptoms which come from the upper gut. You will usually notice this discomfort located anywhere between the bottom of the breastbone and the navel.

Stress alone can indeed cause indigestion, as it acts as a major and common symptom trigger. The strong biological connection between your brain and your gut means that anxiety can directly increase acid production and disrupt the normal, smooth muscle contractions of digestion. This response can lead to uncomfortable bloating and pain without any specific food trigger being involved.

Indigestion (Dyspepsia): Causes and Quick Relief

What is indigestion?