Why Do Pregnancy Farts Smell So Bad — Why Do Pregnancy Farts Stink So Bad


Pregnancy is a time filled with many changes and surprises, including an increase in flatulence. What’s even more surprising is that pregnant women’s farts tend to smell worse than usual. Despite its unpleasantness, this topic raises many questions regarding the science behind pregnancy farts. In this article, we explore the reasons why pregnancy farts smell so bad based on studies conducted by scientists and medical professionals.

1. Changes in Hormones

Hormones play a crucial role during pregnancy, and an increase in certain hormones can affect virtually every aspect of a woman’s body. One hormone, progesterone, is known to cause changes that lead to bad-smelling pregnancy farts. Progesterone helps relax certain muscles in the body, including the ring of muscle that typically controls bowel movements. As a result, pregnant women frequently experience gas and bloating, leading to foul-smelling farts.

Another hormone, estrogen, can also cause unpleasant farts during pregnancy. When levels of estrogen rise, it can lead to an increase in the number of gut bacteria present in the digestive system. These bacteria produce methane, hydrogen, and hydrogen sulfide gas that smells quite terrible when released through flatulence. Increased levels of estrogen can also slow down digestion, leading to more bacteria in the gut and eventually more smelly farts.

Lastly, high levels of human chorionic gonadotropin (hCG), a hormone produced during pregnancy, can also lead to increased flatulence and bad-smelling farts. HCG can cause the intestinal tract to work harder in order to assimilate all the nutrients being consumed, leading to gas buildup and occasional flatulence.

2. Changes in Diet

Another possible cause of foul-smelling pregnancy farts is a change in diet. Pregnant women tend to experience cravings and aversions related to food, and may begin to consume more or less of certain foods. When food is broken down during the digestive process, gases including methane and hydrogen sulfide are released as byproducts. Depending on the specific food, these gases can have a strong smell that contributes to unpleasant flatulence.

During pregnancy, many women also consume more fiber than usual in an effort to stay regular and avoid constipation. While fiber is good for digestion and important for bowel health, it can also produce more gas in the intestines. This increased gas production can lead to more frequent, smelly farts.

Sometimes, women experience an increase in flatulence due to intolerance or sensitivity to lactose or gluten. Eating food that contains lactose or gluten can cause digestive issues like bloating, diarrhea, and excessive farting. Pregnant women are more likely to experience these sensitivities due to changes in hormone levels and digestion.

3. Gut Bacteria Changes

The digestive system includes millions of bacteria that help break down food and assist with the digestive process. Because hormones and digestion change during pregnancy, the balance of gut bacteria in a pregnant woman’s body may shift. An increase in certain types of bacteria in the gut can create more sulfurous-smelling flatulence.

Pregnancy can also cause imbalances in the microbiome – the ecosystem of microorganisms that live in the gut. Recent research has suggested that imbalances in the gut microbiome can lead to a variety of health issues, including digestive problems and bad-smelling farts.

Furthermore, women who take probiotics during pregnancy may experience an increase in gas production, which can contribute to bad-smelling farts. Probiotics work by providing a dose of “good” bacteria to the gut, which can alter the types and amounts of bacteria present. These changes can lead to an increase in gas production and smelly farts.

4. Swallowing Air

One factor that contributes to increased flatulence during pregnancy is swallowing air. Pregnant women, like all humans, swallow small amounts of air while they eat, drink, or talk. This air can become trapped in the digestive system and eventually be released as a fart. In addition, pregnant women may experience fatigue or nausea, causing them to breathe faster and swallow more air than usual.

Some researchers also suggest that wearing tight clothing during pregnancy can also increase the risk of swallowing air. Tight clothes can restrict breathing and cause women to swallow more air, leading to more flatulence and bad-smelling farts.

5. Stress and Anxiety

Pregnancy is a stressful time – many women experience anxiety and mood swings that can cause physical symptoms like stomach cramps, diarrhea, and flatulence. Stress and anxiety can affect bowel movements, causing food to pass through the digestive system more slowly and leading to increased gas buildup. This can result in more frequent and smelly farts.

Additionally, some women may experience a condition known as irritable bowel syndrome (IBS), which can cause chronic flatulence and foul-smelling farts. IBS is often triggered by stress and anxiety, making it more likely that pregnant women with IBS will experience unpleasant farts due to increased anxiety levels.


In conclusion, there are many potential causes of bad-smelling pregnancy farts. Changes in hormones, diet, gut bacteria, swallowing air, and stress and anxiety can all contribute to increased flatulence during pregnancy. While these farts may be unpleasant, they are usually harmless and not a sign of a serious health issue. If you’re concerned about your flatulence during pregnancy, speak with your doctor or medical professional to determine if there may be an underlying issue causing your symptoms.

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