Recent research carried out by the University of Birmingham, is helping to clarify how bile acid diarrhoea affects the gut. It is also revealing how changes in the gut microbiome may play a key role in ongoing symptoms that are usually associated with IBS.
This research is especially relevant for people who develop digestive problems after cholecystectomy, where bile handling in the body changes permanently.
What is bile acid diarrhoea?
Bile acids are produced by the liver to help digest fats. Under normal circumstances, they’re released into the intestine in controlled amounts, then are reabsorbed further down the gut. When this recycling process doesn’t work properly, excess bile acids spill into the colon. Here, they can irritate the lining of the bowel, resulting in frequent, urgent, loose stools.
Bile acid diarrhoea can occur for several reasons, but it’s particularly common after gallbladder removal. Without the gallbladder acting as a storage reservoir, bile flows continuously into the intestine rather than being released in response to meals. For some people, the bowel adapts smoothly. For others, this constant bile exposure becomes problematic.
As the symptoms overlap so closely with diarrhoea-predominant IBS, bile acid diarrhoea is often under-recognised. Many patients live with symptoms for years without realising there may be a specific, treatable cause.
The gut microbiome connection
Researchers from Birmingham University examined how bile acid diarrhoea interacts with the gut microbiome (the vast community of bacteria that live in the digestive tract).
The study found that those with bile acid diarrhoea had a distinctly different microbial profile compared with healthy people. There was a reduction in bacteria involved in bile acid metabolism, the microbes that normally help convert bile acids into less irritating forms. At the same time, certain bacterial groups associated with inflammation and faster gut transit were more prominent.
This matters because bile acids and gut bacteria are in constant conversation. Bile acids shape which bacteria thrive in the gut, while bacteria influence how bile acids are modified and recycled. When this balance is disrupted, it can create a feedback loop. Excess bile acids alter the microbiome, and an altered microbiome makes bile acids more disruptive to the bowel.
Over time, this may help explain why some people develop persistent IBS-like symptoms after gallbladder removal, rather than settling back into normal digestion.
What this means for patients
For patients, understanding the microbiome’s role opens the door to more targeted treatments that can improve quality of life. While bile acid sequestrants (medications that bind excess bile acids) are effective for many patients, they don’t work for everyone.
If microbial imbalance is part of the problem, future treatments may involve more tailored dietary strategies, microbiome-directed therapies, or combinations of approaches rather than a single solution.
If you’ve had your gallbladder removed and experience chronic diarrhoea, urgency, or bloating, especially if symptoms began after surgery, let your healthcare team know straight away. Testing is available, and when the diagnosis is confirmed, treatment can be highly effective.
If you are worried about any symptoms you are experiencing, call us on 01926 492969 to arrange a consultation with colorectal surgeon Mr Michael Stellakis.
