Iron deficiency anemia, cirrhosis, colorectal cancer, disseminated intravascular coagulation, peptic ulcer, or stomach cancer.
Certain medications may cause gastrointestinal discomfort and diarrhea. Taking some over-the-counter multivitamins may also cause foul-smelling stools if you’re allergic to the supplements’ ingredients. After a course of antibiotics you may experience foul smelling stools until your normal bacterial flora is restored. If you have inflammatory bowel disease, also known as IBD, eating certain foods will cause your intestines to become inflamed. People with IBD often complain of foul-smelling diarrhea or constipation. Affected individuals also have flatulence after eating certain foods. This flatulence may have a foul smell. Many different diseases, disorders and conditions can lead to foul-smelling stools. Foul-smelling stools can be a sign of inflammatory disorders, intestinal infections, malabsorption disorders, and inherited medical conditions. Serious or life-threatening causes of stool odor. In some cases, foul-smelling stools may be a symptom of a serious or life-threatening condition that should be immediately evaluated in an emergency setting. These include: Abdominal abscess. Intestinal obstruction. Often a change in your diet is the reason for foul-smelling stools; malabsorption is another common cause. Malabsorption occurs when your body is unable to absorb the proper amount of nutrients from the food you eat. If you have inflammatory bowel disease, also known as IBD, eating certain foods will cause your intestines to become inflamed. People with IBD often complain of foul-smelling diarrhea or constipation. Affected individuals also have flatulence after eating certain foods. This flatulence may have a foul smell. Considerations. Stools normally have an unpleasant odor. Most of the time the odor is familiar. Stools that have an extremely bad, abnormal odor may be due to certain medical conditions. Foul-smelling stools also have normal causes, such as diet changes. Foul-smelling stool: The occurrence of stool that has an offensive smell. See detailed information below for a list of 63 causes of Foul-smelling stool, Symptom Checker, including diseases and drug side effect causes.  Infections that affect the intestines may also cause foul-smelling stools. One infection called gastroenteritis occurs after ingesting food that has been contaminated with E. coli and Salmonella, as well as certain other viruses, bacteria, or parasites. If you have inflammatory bowel disease, also known as IBD, eating certain foods will cause your intestines to become inflamed. People with IBD often complain of foul-smelling diarrhea or constipation. Affected individuals also have flatulence after eating certain foods. This flatulence may have a foul smell. Find a Gastroenterologist Near You. Changes in stool odor can be caused by the foods you eat. Even extremely foul-smelling stools can be due to changes in your diet. However, abnormally foul-smelling stools may also be a sign of a disease, disorder or condition. Examples include celiac disease, Crohn’s disease, cystic fibrosis, and intestinal infections. 2. Black or tarry stools (Melena) - the passage of black, tarry and foul-smelling stools; can be an indication of digested blood in the stool. Other causes are, iron deficiency anemia, cirrhosis, colorectal cancer, disseminated intravascular coagulation, peptic ulcer, or stomach cancer. Possible causes for clay colored stool result from problems in the biliary system (the drainage system of the gallbladder, liver, and pancreas): Malabsorption problems can cause undigested fat in the stool (steatorrhea) which is characterized by foul smelling, light yellow to gray, greasy or frothy stools. Stool odor is the smell associated with stools, or bowel movements. Stools normally have an unpleasant odor. Stools are formed in the large intestine (colon), which is part of the digestive system. However, abnormally foul-smelling stools may also be a sign of a disease, disorder or condition. Examples include celiac disease, Crohn’s disease, cystic fibrosis, and intestinal infections.
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what causes very foul smelling stools