What is the reason for the special odor of stool?

Stool odor is caused by gastrointestinal dysfunction, a variety of diseases caused by gastrointestinal dysfunction, will cause stool odor symptoms. Because of gastrointestinal dysfunction, unable to digest and absorb food in time, it will cause transitional fermentation of food, so ammonia, hydrogen sulfide, methane and other odorous substances will be produced, which will show particularly smelly stool, and the causes of digestive dysfunction include tumor, especially for the elderly, gastroscopy should be improved to exclude the possibility of malignant tumor.