Why does my diarrhea smell like rotten eggs?

Foods that contain a lot of sulfates, such as eggs, cabbage, broccoli, and cauliflower, can make stool have a sulfur (rotten egg) smell. This is usually harmless, but if the symptom continues, check with your doctor. Some people with sulfur-smelling stool may have giardiasis (beaver fever).

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This article outlines some causes of foul-smelling stool, as well as information on diagnosis, treatment, and signs for seeking medical help. Foul-smelling stool has a putrid and rotten odor. Usually, this smell is from foods that people eat. Sometimes though, foul-smelling stool can indicate health problem, such as an infection, an allergy, or colitis. There are many reasons stool can have a bad smell. These may include the foods people eat, food allergies or intolerances, infections, and any underlying medical conditions. This section lists a few of the possible reasons.

1. Viral or bacterial illnesses

Viral or bacterial infections and parasitic infections can affect digestion and cause foul-smelling stool or diarrhea. These include:

2. Antibiotics and infection

People taking antibiotics may get temporary stomach upset and smelly stool when antibiotics disrupt the delicate balance of good and bad bacteria within the gut. Symptoms usually go away after finishing antibiotics, and the good gut bacteria return to usual. Sometimes, antibiotics destroy so many good digestive bacteria that the harmful ones multiply out of control, causing infection.

3. Malabsorption syndromes

Malabsorption encompasses different conditions that can make it difficult to digest certain foods. This can often cause foul-smelling stool. Examples include:

Lactose intolerance

Lactose is a type of sugar in milk and other dairy products. The enzyme lactase breaks lactose into two smaller sugars. Then the gut can absorb the smaller sugars into the bloodstream. A lactose-intolerant person does not produce enough lactase to break up the sugars. Loose, foul-smelling stool forms when the intestines draw water from the bloodstream to dilute the indigestible lactose sugar.

Milk allergy

A milk allergy is not the same as lactose intolerance. The American College of Allergy, Asthma & Immunology (ACCAI) says that people who have a milk allergy have an overactive immune reaction to milk products, similar to a peanut allergy reaction. This immune reaction can include hives, rash, or lips, tongue, and throat swelling. In addition, bloody, strong-smelling stool can result because of immune system irritation of the gut. Under the U.S. Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA) , food packages must list milk protein as an allergen.

Celiac disease

According to the American Gastroenterological Association (AGA), people with celiac disease experience an immune reaction to eating gluten, a protein in wheat, barley, and rye. Therefore, FALCPA also requires gluten ingredients to be listed on food packaging to assist celiac patients in avoiding this protein. In celiac disease, the immune system overreacts to gluten and attacks the small intestine lining.

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Continual attacks on the small intestine lining can cause difficulty absorbing vitamins and nutrients from food. This malabsorption problem can lead to fatty, unpleasant-smelling stool and other complications.

Ulcerative colitis

Ulcerative colitis is a chronic type of IBD. In ulcerative colitis, the colon’s lining becomes inflamed and develops ulcers. Ulcerative colitis experts think this condition occurs when the immune system mistakes good intestinal bacteria for harmful bacteria. In response, it sends an overabundance of white blood cells into the gut to help fight infection. Excess white blood cells continue to surge into the large intestine, causing chronic inflammation and bad-smelling stool with blood or mucus.

Crohn’s disease

Crohn’s disease is another type of IBD. It can cause persistent and bad-smelling diarrhea. It may affect any part of the gastrointestinal (GI) tract, from mouth to rectum, similarly to ulcerative colitis.

Chronic pancreatitis

Chronic pancreatitis is a persistent inflammation of the pancreas that worsens over time. As a result, a person may have an oily, fatty, foul-smelling, pale-colored stool. Chronic pancreatitis causes permanent damage, which affects a person’s ability to digest food and make pancreatic hormones.

Exocrine pancreatic insufficiency

With exocrine pancreatic insufficiency (EPI), the pancreas does not produce enough digestion enzymes. This can lead to indigestion symptoms, which may include foul-smelling stool. It can also lead to poor absorption of vitamins and minerals and unintended weight loss.

4. Short bowel syndrome

Short bowel syndrome (SBS) is a rare condition that occurs when a portion of the small or large intestine is absent or unable to function. Because of this, people with SBS often experience pale, greasy, smelly stool and, eventually, malabsorption of nutrients, which can cause serious complications. SBS can occur for many reasons. A common cause is the surgical removal of intestine parts after other unsuccessful treatments for inflammatory bowel disease (IBD).

medicalnewstoday.com - What Causes Foul-Smelling Stools? - Medical News Today