7 doctors weighed in:
What causes flatulence odor?
7 doctors weighed in

Dr. James Ferguson
Pediatrics
3 doctors agree
In brief: Germs create gasses
The odor of flattus is derived from the gas produced by the germs that live in your digestive tract.
Methane is one common product. The character of the odor is influenced by your diet and the variety of gasses produced by separate bacteria.The germs live off what is not absorbed during digestion.

In brief: Germs create gasses
The odor of flattus is derived from the gas produced by the germs that live in your digestive tract.
Methane is one common product. The character of the odor is influenced by your diet and the variety of gasses produced by separate bacteria.The germs live off what is not absorbed during digestion.
Dr. James Ferguson
Dr. James Ferguson
Thank
1 comment
Dr. Joel Gallant
For more on this fascinating subject, I recommend "Gulp: Adventures on the Alimentary Canal" by Mary Roach. In this book, I learned that the methane in intestinal gas is odorless. The main causes of the smell are volatile sulphur compounds, which make up a very small proportion of the volume of flatus.
Dr. Marsha Davis
Internal Medicine
1 doctor agrees
In brief: The organisms that
Live in the intestines produce gasses.
When the gas is passed out comes the smell just like when you have a bowel movement

In brief: The organisms that
Live in the intestines produce gasses.
When the gas is passed out comes the smell just like when you have a bowel movement
Dr. Marsha Davis
Dr. Marsha Davis
Thank
Get help from a real doctor now
Dr. Vicken Poochikian
Board Certified, Internal Medicine
38 years in practice
2M people helped
Continue
108,000 doctors available
Read more answers from doctors