What is bile acid diarrhea?
Bile and its role in digestion
Bile is a digestive fluid made in the liver. It contains bile salts, which are essential for helping your body absorb fats from food. Most of these bile salts are recycled: after they do their job in the small intestine, they are reabsorbed and sent back to the liver to be used again.
However, a small portion, about 5%, escapes this recycling process and moves into the colon (the large intestine). In the colon, bile salts have a natural laxative effect. For some people, when too many bile salts reach the colon, they draw extra fluid into the intestine and disrupt normal bowel function, leading to loose, watery stools.
How common is BAD?
Globally, around 1% of people are affected by bile acid diarrhea. Among individuals who suffer from chronic diarrhea, studies suggest that about one in three actually has BAD.
Symptoms to look out for
Bile acid diarrhea can be recognized by several typical features:
- Recurrent watery diarrhea, often yellowish and sometimes “fluffy” in appearance
- Foul-smelling stools
- Night-time diarrhea (waking you up from sleep)
- Abdominal pain and cramps
- Bloating and gas
- Stool leakage (incontinence)
Because the symptoms overlap with other digestive disorders, BAD is often misdiagnosed as IBS-D (irritable bowel syndrome with diarrhea).
What causes bile acid diarrhea?
BAD can be secondary to other conditions, including:
- Crohn’s disease
- Microscopic colitis
- Chronic pancreatitis
- Amyloidosis
It can also occur without any other underlying disease or surgery. This form is called idiopathic bile acid diarrhea (Type 2 BAD).
How is BAD diagnosed?
One specialized test for BAD is the 75Se HCAT test. During this test, the patient swallows a capsule containing a tracer substance, which is then tracked to see how it is metabolized in the body. The test involves a very low dose of radiation and is not performed on pregnant women.
Other tests may also be used depending on your situation, especially to rule out related conditions.
Treatment options
The main treatment for bile acid diarrhea involves bile acid-binding medications, such as:
- Questran (cholestyramine)
- Lestid (colestipol)
These drugs help capture excess bile acids in the intestines, reducing diarrhea and discomfort.
In addition, patients are often advised to moderate their fat intake, since high-fat meals can stimulate bile release and worsen symptoms.
Living with BAD
With the right diagnosis and treatment, most people with bile acid diarrhea can manage their symptoms effectively. If you experience chronic watery diarrhea, especially at night, along with bloating, urgency, or stool leakage, it’s worth talking to a doctor about the possibility of BAD. Early recognition can make a big difference in improving quality of life.
