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6 Poop Smells That Could Be Red Flags

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You can learn a lot about your health from the smell of your stool.

While unpleasant, stool odor is more than just a nuisance—it can be an important indicator of overall well-being.

Health experts explain that the scent of your stool can reveal changes in your body and point to potential health issues.

Odors can range from mild to intense depending on the cause. Some are harmless and diet-related, while others may signal underlying health problems.

Let’s explore the different types of stool odors and what they might mean for your health.

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Shutterstock

1. Normal Stool Odor and Healthy Digestion

A healthy stool typically has a mild, slightly sour scent—this natural odor results from the breakdown of fiber and the activity of gut bacteria during digestion. As your body processes food, these bacteria produce compounds that give stool its characteristic smell. In general, if your digestive system is working well, your poop shouldn’t have a strong or offensive odor—often resembling subtle, earthy smells similar to fruits or vegetables.

2. Foul-Smelling Stool

An extremely strong or unpleasant odor may be a red flag. Often, it points to poor digestion or an imbalance in gut bacteria. If your body isn’t breaking down food properly, it can ferment in your intestines, creating a potent smell. A lack of beneficial bacteria or an overgrowth of harmful ones can also disrupt your gut balance and contribute to the foul odor.

Another common cause is eating too much meat. A protein-heavy diet can produce hydrogen sulfide, a gas that smells like rotten eggs. The more meat you eat, the more intense this smell may become.

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Shutterstock

3. Sour-smelling Stool

A sour odor might indicate an imbalance in your gut microbiome. Poor digestion allows harmful bacteria to ferment food, producing lactic acid and causing a sour smell. This is often seen in people with digestive issues, such as frequent diarrhea. Conditions like lactose intolerance or irritable bowel syndrome (IBS) can also cause stool to smell sour.

4. Sweet-Smelling Stool

If your stool has a sweet scent, it could be related to diabetes. In people with poorly managed blood sugar, the body may produce excess ketones with a fruity or sweet odor. This smell can appear in both breath and stool. For people with diabetes, this change can be an important clue that something else may be happening and shouldn’t be ignored.

5. Greasy-Smelling Stool

A greasy smell often indicates fat malabsorption, when your body isn’t properly digesting or absorbing fats. This can occur in conditions such as pancreatitis, gallstones, or Crohn’s disease. When fats aren’t broken down, they pass through the digestive system and produce a greasy, foul-smelling stool. Even a temporary diet high in greasy foods can cause this odor.

6. Foul Odor from Infection

If your stool suddenly smells especially bad and is accompanied by symptoms like diarrhea or stomach cramps, it could signal an infection. Bacterial infections, parasites, or food poisoning can all lead to changes in stool odor. These conditions disrupt your gut health and may produce a strong, rotten smell as your body fights off the invader.

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