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Stools - foul smelling

Definition

Foul-smelling stools are stools with a very bad odor. They very often have to do with what you eat, but may be a sign of a medical condition.

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.

Causes

Causes may include:

• Celiac disease (also called celiac sprue)

• Crohn disease

• Ulcerative colitis

• Chronic pancreatitis

• Cystic fibrosis

• Intestinal infection

• Malabsorption

• Short bowel syndrome

• Blood in stool from stomach or intestine

Home Care

Home care depends on what is causing the problem. Things you can do include:

• Follow your health care provider's instructions.

• If you have been given a special diet, stick to it closely.

• If you have diarrhea, drink more fluids so you do not get dehydrated.

When to Contact a Medical Professional

Contact your provider if you have:

• Black or pale stools often

• Blood in the stool

• Changes in the stool related to diet

• Chills

• Cramping

• Fever

• Pain in the abdomen

• Weight loss

What to Expect at Your Office Visit

Your provider will perform a physical exam and ask about your medical history. Questions may include:

• When did you first notice the change?

• Are your stools an abnormal color (such as pale or clay-colored stools)?

• Are your stools black (melena)?

• Are your stools hard to flush?

• What sort of diet have you eaten recently?

• Does a change in your diet make the smell worse or better?

• What other symptoms do you have?

The provider may take a stool sample. Other tests may be needed.

References

Höegenauer C, Hammer HF. Maldigestion and malabsorption. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 104.

Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 126.

Review Date: 8/12/2024

Reviewed By: Jenifer K. Lehrer, MD, Gastroenterologist, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.