Startling Reasons Why Your Breath Smells Like Poop?


Why does my breath smell like poop? You may be asking yourself this question. You’re depressed and devastated; your relationships and social life are negatively affected, and even your career had come to a standstill.

However, take comfort from the fact that you’re not alone. Millions of people have a faecal smelling breath even after brushing their teeth thoroughly and gargling with mouthwash. There has to be a solution to this embarrassing problem.

Based on science, I have come up with the startling reasons why your breath smells like poop. For you to get rid of the problem, you have to know the root cause.

But first, we have to learn some scientific facts about how food is digested and metabolized in the body. This is for you to understand the concept.



Digestion of Food

There are three major foodstuffs that enter the body. These are carbohydrates (rice, pasta, bread); proteins (meat, legumes, eggs); and fats or lipids (fat meat, some dairy products). All these foods enter the mouth and go into the esophagus, into the stomach, to the small intestines, and then to the large intestines.

The stomach is highly acidic, containing hydrochloric acid, and other enzymes (pepsin) for the digestion of proteins. The fats and carbohydrates are not digested in the stomach but in the small intestines. This is due to the stomach’s acidity.

The stomach’s content is prevented from going back into the esophagus by the lower esophageal sphincter (LES), a valve that closes and opens into the stomach whenever necessary. This valve closes when you need to breathe, and opens when you need to swallow. That’s why you cannot swallow and breathe simultaneously. One process has to give in.


7 Reasons for Question: "Why does My Breath Smell Like Poop?"

1. Dysfunctional Digestive System (GUT)

When the LES valve becomes dysfunctional and food goes back into the esophagus, this can give a fetid odor (poop odor) because of the combination of the smell of hydrochloric acid and food.

In addition, the second valve called the pyloric sphincter is responsible in opening the end of the stomach to the opening of the small intestines.

The third sphincter that leads to the large intestines from the small intestines is the ileocecal valve. This is a sphincter that keeps the contents of the small intestines inside until complete digestion occurs.

The ileocecal valve also prevents the entry of bacteria and fecal material into the small intestines from the large intestines.

When these sphincters are dysfunctional, this impairment may cause different disorders, including breath that smells like poop. This is because the fecal smell that comes from the large intestines may go all the way to the mouth.

Likewise, the smell of the hydrochloric and food combination can smell like poop too.


You will have to consult your doctor to determine if you have indeed disorders in your digestive system. After an affirmative diagnosis, the specialist can treat your disorder, to eliminate your poop-smelling breath. If not, then the doctor can identify other causes.

2. Foods that You Eat

The type of food that you eat is one of the reasons why your breath may smell like poop. Examples of these are red meat, garlic, onions, alcohol, eggs, beans, spicy foods and dairy products, such as cheese can cause poop smelling breath.

When these foods are mixed with hydrochloric acid (HCl) in the stomach, they can produce a fetid odor. For persons, who have been exposed to HCl acid in the lab, they would know that the acid has a rancid odor that can turn fetid when combined with other substances.


You need to reduce the acidity of your stomach to reduce the smell of poop. Foods, such as vegetables and fruits, can decrease the stomach’s acidity. Hence, reduces the chance of emitting a poop-smelling breath.

Avoid carbonated drinks (cola), also coffee and cigarette because they can cause dryness of mouth, which can lead to bad breath that may smell like poop.

Using natural cures, such as baking soda and lemon, is a better alternative than gargling with expensive mouthwashes. Utilizing baking soda can eliminate bad odor from your mouth.

3. Tonsil Stones

Tonsil stones can cause poop smelling breath or bad breath. This is because bacteria can attach themselves to these tonsil stones and cause faecal odor.


Its management is to remove them. You can easily eradicate them as shown in this YouTube video.

4. Bacteria Infected Gums/Teeth

Poor hygiene will allow bacteria to amass in infected gums and teeth. Most of these bacteria will emit a poop odor. Take note that the bacteria are the major cause of the smelly breath. They feed on plaque and abscesses in the teeth.


Proper oral hygiene must be observed, such as brushing the teeth properly twice a day, and flossing once a day.

​Visit the dentist at least every 6 months for teeth cleaning.

Using a tongue scraper, you can scrape your tongue from the back going outwards. You can do this once a day.



5. Food Deposits

The food deposits that remain in your mouth will attract microorganisms because they act as nutrients for microorganisms to proliferate.These food deposits when left in between your teeth for a long time will rot and attract hordes of microorganisms, which can emit a fecal odor.


Its management is through the observation of proper mouth hygiene, as previously discussed. Doing proper hygiene will prevent fecal breath from occurring.

6. Respiratory Diseases

Respiratory diseases, such as chronic bronchitis can cause breath that smells like poop. Again, most bacterial growths produce fecal odors; so if you have pathogenic bacteria in your respiratory system, this can cause poop-smelling breath.


Consult a respiratory specialist and treat the respiratory disease. When the disease is cured, the poop odor will disappear as well.

7. Diabetes Mellitus (DM)

DM can cause a poop smelling breath because of hyperglycemia (increased levels of glucose in the bloodstream) and ketoacidosis. Patients with DM have an increased risk of bowel obstruction emitting breath that smells like poop.

Ketoacidosis is a condition where ketoacids (acetone, acetoacetate, hydroxybutyric acid) are present in your system due to the increased utilization of lipids as a source of energy.

These substances can cause fruity or fecal odors in your mouth. Bacteria also feed on glucose, so it enhances the growth of bacteria anywhere in the body, including the mouth.


Manage the DM, and you can manage your fetid breath too. DM is a complex disorder due to insufficient insulin, so you have to consult a specialist to determine the next best course of action.




The startling reasons why your breath smells like poop are presented. Generally, it’s the accumulation of bacteria that causes the fecal-smelling breath.

Now, it’s time for you to take action. Consult respiratory, metabolic and digestive system specialists to rule out underlying diseases that can cause your poop-smelling breath.

If you don’t have any illnesses, observe the following:

  • Proper mouth hygiene.
  • Proper diet.
  • Follow all the management procedures mentioned.

If you do this, you will soon turn your poop breath into a fresh-smelling breath.

I would like to know your opinion and inputs. Have you performed any of the management measures mentioned? What are you doing to ascertain that you don’t have a breath that smells like poop? You can share your experiences with us through the comment section below.


Hello everyone! I’m glad to have you here. I’m a medical technologist by profession. My second love is writing. So, I’m focusing on providing content to help other people with their health problems. I hope I can be of help to you.

Click Here to Leave a Comment Below
Elise - November 4, 2017 Reply

I have breath that smells like feces. It is so offensive that nobody can speak to me unless they cover their nose or I cover my mouth. I have isolated myself and really want to have a social life. I also have periodontal disease. If the smell is from bacteria and not any other illness will it ever get better? If I change my diet do I have a chance to have normal breath?

    Adelaide - November 5, 2017 Reply

    I think your diet is not the main reason. You said you had periodontal disease? Please go to hospital, they will help you cure this disease. I believe your breath will be better

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