Stomach Problems and Bad Breath: What's the Connection?

Bad breath, or what's scientifically called halitosis, is a common experience that can affect your confidence and interactions with others. If you're concerned you're alone, don't be; bad breath is one of those topics many are too embarrassed to talk about, but it's estimated that around 50 million people in the U.S. struggle with halitosis. 

Bad breath is caused by the chemical compounds found in the breath you exhale, volatile sulfur compounds (VSCs) for mouth-related problems, and volatile organic compounds (VOCs) stemming from issues outside the mouth (like digestive conditions). 

Many attribute the causes of bad breath to oral health, and while dental problems are the most common problem, it's not the only cause. Gastrointestinal health concerns can also play a role, so if you're dealing with bad breath, it's essential to look at all the possible root causes.

This article will delve into the connection between bad breath from stomach problems (and other potential issues), explore the impact of diet and lifestyle, and provide practical guidance for those seeking relief.

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Causes and Symptoms of Your Bad Breath

Bad breath from the stomach is one possibility, but there are other possible causes to consider, each with its own symptoms and treatments. Let's look at each common cause in more detail:

• Gum disease: The first consideration is oral hygiene and gum disease. Bacteria and plaque in the gums can trap food particles, causing bad breath. This can be accompanied by bleeding, swollen, tender, or receding gums.

• Tooth anatomy: Some people have naturally deep canals in their molars, which bacteria can use as refuges. Extra bacterial growth can equal bad breath.

• Post-nasal drip: If you constantly feel the need to clear your throat or suffer from allergies, it could contribute to bad breath. The mucous can trap bacteria and food particles, leading to odors.

• Ketogenic diet: Some people who follow a ketogenic diet (a very low-carb, high-fat diet) report bad breath due to increased production of ketones. Usually, this occurs initially as the body adapts to the diet and eventually goes away, but it can sometimes persist.

• Foods: Certain foods like garlic and onions are more aromatic and can contribute to bad breath. These foods aren't necessarily a concern for everyone who eats them, but if you're prone to bad breath, they could add to the problem.

• Gastroesophageal reflux disease (GERD): GERD is where food, bile, and stomach acid move back into the esophagus from the digestive tract, causing painful symptoms and sometimes sour-smelling breath.²

• Irritable bowel disease (IBD): Crohn's disease and ulcerative colitis are the two types of IBD that cause inflammation and changes in the anatomy of the intestines. Some research links alterations in digestion and the GI tract from IBD with bad breath.

• Small intestinal bacterial overgrowth (SIBO): SIBO is a condition where bacteria in the small intestine grow in amount or variety. It can cause digestive system issues, bad breath, bloating, and other symptoms.

• H. Pylori and stomach ulcers: H. Pylori is a bacteria many people naturally have in the stomach, but too much can cause issues like stomach ulcers. Both H. Pylori and ulcers can cause digestive symptoms and bad breath.

• Liver disease: Liver disease is often accompanied by a high production of VOCs in the breath that can contribute to bad breath. Some research suggests using breath measurements to help diagnose chronic liver disease.

• Kidney disease: Your kidneys filter toxins out of your body. When they aren't working as well as they should, the build-up of toxins combined with medications that lower saliva production can lead to bad-smelling breath.

While it's estimated that 90% of halitosis cases are related to oral health, the remaining 10% of reasons may be related to stomach problems and can be very serious.³ If you have been to a dentist and they've ruled out oral reasons for bad breath, meeting with your doctor to rule out any other causes and medical conditions is vital.

Other Related Symptoms

Your healthcare provider can help you determine if stomach or digestive issues cause your bad breath. Still, if you also experience any of the following symptoms, it could be a hint there's a connection:

• Nausea
• Abdominal pain
• Bloating
• Burping
• Loss of appetite
• Weight loss
• Peptic ulcers

What Your Diet Says About Your Breath

A simple explanation for bad breath may also be related to your food. It's worth noting that these foods aren't a problem for everyone, but if you already suffer from bad breath, they may worsen your condition. Some of the foods most commonly linked to bad breath include:

• Spicy dishes

• Dairy products

• Alcohol-based beverages

Many foods on this list are hard to digest for people with digestive issues like irritable bowel syndrome (IBS) or acid reflux. Addressing diet to optimize digestion could be a way to eliminate bad breath and find foods that trigger the condition. If you aren't sure where to start, working with a dietitian can help you create a digestive-friendly diet to feel better and eliminate bad breath.