Should You Worry About Foul-Smelling Gas? A Surgical Perspective - Surgery

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Hello, foul-smelling flatulence?


Hello doctor, I just went to the bathroom and passed gas first.
The smell of this gas was different from usual; it had a foul odor.
Later, I wiped my bottom with toilet paper and noticed that the smell was the same as the gas, but it didn't smell like feces.
Should I get this checked out? I had a doctor's appointment in early June due to a significant amount of mucus and blood, and I was diagnosed with internal hemorrhoids.
I would like to know if the foul-smelling gas requires further examination.
Thank you.

Wei, 20~29 year old female. Ask Date: 2016/06/23

Dr. Ke Fangxu reply Surgery


If your diet consists mainly of meat or strong-flavored foods, the odor of your stool and gas will naturally be stronger.
It is recommended to switch to a lighter diet and observe the changes.
If there is no improvement, a colonoscopy can be arranged.

Reply Date: 2016/06/23

More Info


Dear Patient,
Thank you for your question regarding the foul-smelling gas you experienced. It's understandable to be concerned about changes in bodily functions, especially when they deviate from what is considered normal. Let's break down the situation and explore whether further medical evaluation is necessary.

Firstly, it's important to recognize that the odor of flatulence can vary significantly based on several factors, including diet, gut health, and the presence of any underlying medical conditions. Foods that are high in sulfur, such as broccoli, cauliflower, and eggs, can lead to particularly foul-smelling gas. Additionally, certain digestive disorders, such as lactose intolerance or irritable bowel syndrome (IBS), can also contribute to changes in the odor of gas.

In your case, you mentioned that the odor was notably different from what you typically experience. While occasional changes in the smell of gas are usually not a cause for alarm, persistent or significantly foul-smelling gas could indicate an underlying issue. For instance, if the odor is accompanied by other symptoms such as abdominal pain, bloating, diarrhea, or changes in bowel habits, it may warrant further investigation.

You also noted a previous diagnosis of internal hemorrhoids and the presence of mucus and blood. While hemorrhoids themselves may not directly cause foul-smelling gas, any gastrointestinal bleeding or changes in bowel habits should be taken seriously. The presence of blood, even if it is mucus, can indicate a more serious condition that may require further evaluation. It is crucial to monitor any additional symptoms that may arise, such as increased pain, changes in stool color, or any new gastrointestinal symptoms.

From a surgical perspective, if you are experiencing persistent foul-smelling gas along with any of the aforementioned symptoms, it would be prudent to consult with a healthcare professional. They may recommend diagnostic tests such as a stool analysis, imaging studies, or a colonoscopy to rule out any serious conditions, including infections, inflammatory bowel disease, or other gastrointestinal disorders.

In summary, while occasional changes in the odor of gas are generally not a cause for concern, the combination of foul-smelling gas with your history of internal hemorrhoids and the presence of blood and mucus suggests that a follow-up with your healthcare provider is advisable. They can provide a thorough evaluation and determine if any further testing or treatment is necessary.

In the meantime, consider keeping a food diary to track any dietary triggers that may be contributing to the changes in your gas odor. Staying hydrated and maintaining a balanced diet rich in fiber can also support overall digestive health.

Thank you for reaching out with your concerns, and I hope this information helps you make an informed decision about your health. Please do not hesitate to seek medical attention if you feel it is necessary.

Best regards,
Doctor Q&A Teams

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