Is there a difference between acid reflux and indigestion?

Quite often, the terms acid reflux and indigestion are used interchangeably without fully understanding the differences between the two.

There are in fact a number of differences between the two as indigestion is not, as many believe, just a milder form of acid reflux.

Discover what causes acid indigestion and what causes acid reflux. Rennie have taken the time to look into both and have put together this guide to allow you to understand the differences for yourself.

What is

Foods that cause indigestion

Acid reflux is a common condition that affects many people in varying degrees.

The condition sees your throat and oesophagus become flooded from the acid produced by the stomach, causing a burning feeling. 1,2

Usually, acid reflux treatment is easy - it can be relieved through medication such as antacids like Rennie Spearmint, which can neutralise the acid in your stomach and stop acid reflux.4

If the acid reflux throat pain persists it is advised to consult a doctor.

However, the reason many people mistake acid reflux for indigestion is the fact that the former is a symptom of the latter rather than a separate condition. Indigestion has a lot more symptoms than just acid reflux

Indigestion is a sense of discomfort or pain in the upper abdomen brought on generally by overeating but can also be brought on through stress, pregnancy, smoking or drinking alcohol.1,13

What are the indigestion symptoms? The first symptom of indigestion can often be feeling bloated after eating. It can also bring on feelings of nausea and frequent belching, along with some occasional incidents of regurgitating food.13

It can happen anytime but is most common shortly after eating.

Indigestion is often caused by excess stomach acid coming into contact with the sensitive, protective lining of the digestive system.

It’s this burning feeling that often leads to people believing that acid reflux and indigestion are different conditions rather than the former simply being a symptom of the latter. 1,13

How to relieve indigestion? If you do have indigestion (and therefore acid reflux!), then Rennie quickly gets to work to relieve the discomfort.

Rennie is an indigestion medicine that helps neutralise the excess stomach acid, turning it into water and other natural substances to ease the discomfort.

To help combat indigestion a good lifestyle and healthy, balanced diet can help decrease the chances of having to deal with either issue.

If the symptoms persist (if you have constant indigestion) or become more regular, consult with your doctor to discover the best course of action for you.


Learn what food cause acid reflux and avoid it.


Heartburn is the name given to the burning feeling or heat that begins in your chest or throat and rises upwards to the throat.

Man experiencing gas pain in chest due to heartburn.

Acid Reflux

Acid reflux is the reverse passage of gastric contents into the esophagus (‘food pipe’) which can cause heartburn.2,4,8

Cause and symptoms


While dining out, try to avoid food that cause heartburn.


Indigestion, also known as dyspepsia, is a general term for pain or discomfort felt after meals in the stomach region, associated with difficulty in digesting food.13   

Cause and symptoms


Pregnant woman in red dress holding baby bump

Heartburn In Pregnancy

Heartburn is very common during pregnancy especially during the third trimester. Heartburn affects 22% of women in the first trimester, 39% in the second and 72% in the last.18

Cause and symptoms


    Rennie Duo

    Rennie Duo

    With its dual action, Rennie® Duo combines its raft-forming and acid-neutralizing properties to provide comprehensive relief and protection from reflux than either action alone.

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    Rennie peppermint

    Rennie Peppermint

    Containing antacid to neutralise excess stomach acid, Rennie Peppermint tablets work fast to relieve the symptoms of heartburn and indigestion.2,3,4

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    Rennie spearmint

    Rennie Spearmint

    Containing antacid to neutralise excess stomach acid, Rennie Spearmint tablets work fast to relieve the symptoms of heartburn and indigestion.2,3,4

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    Rennie orange flavour

    Rennie Orange

    A refreshing alternative to mint flavour tablets for treating your heartburn and indigestion. Rennie Orange gives the same fast and effective relief as the rest of the Rennie range.2,3,4

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    Rennie Aniseed

    Rennie Aniseed

    Containing antacid to neutralise excess stomach acid, Rennie®Aniseed tablets work fast to relieve the symptoms of heartburn and indigestion.2,3,4

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