Bile Reflux

How bile reflux happens

Bile is made in the liver, stored in the gallbladder and released into the duodenum (the first part of the small intestine) to digest fats. Normally, the pyloric valve at the stomach outlet keeps bile from flowing back into the stomach, and the lower esophageal sphincter keeps stomach contents out of the esophagus.

Bile reflux occurs when these barriers fail. Bile acids and digestive enzymes irritate the stomach lining (causing bile reflux gastritis) and, if they reach the esophagus with stomach acid, can cause inflammation and damage.

Causes

• stomach surgery: partial gastrectomy, pyloroplasty, and gastric bypass, which alter or remove the pyloric valve. See postgastrectomy syndrome
• gallbladder removal (cholecystectomy): bile flows continuously into the duodenum rather than in response to meals
• peptic ulcers that scar or block the pylorus, causing bile to pool and back up
• pyloric dysfunction and disorders of gut movement
• often combined with acid reflux (GERD)

Symptoms

• burning pain in the upper abdomen
• heartburn
• nausea and vomiting of greenish-yellow bile
• a persistent bitter or sour taste
• occasional coughing or hoarseness
• unintended weight loss in severe cases

Bile reflux vs acid reflux

The two often occur together, which makes symptoms worse and increases the risk of esophageal damage.

Complications

• gastritis and stomach ulcers
• esophagitis
• Barrett's esophagus: precancerous changes in the lower esophagus, more likely when bile and acid reflux combine
• esophageal cancer (a rare long-term risk)

Diagnosis

• upper endoscopy: shows bile in the stomach, inflammation and ulcers; biopsies can show changes typical of bile (chemical) gastritis and check for Barrett's esophagus
• ambulatory pH-impedance monitoring: detects non-acid reflux episodes in the esophagus
• bilirubin monitoring (bile sensor) in some centers
• hepatobiliary (HIDA) scan: can show bile flowing back into the stomach
• gastric emptying study if slow stomach emptying is suspected

Treatment

Medicines

• ursodeoxycholic acid (ursodiol): changes the composition of bile and may reduce symptoms
• bile acid sequestrants (such as cholestyramine): bind bile acids; can cause bloating and interfere with other medicines, so timing matters
• proton pump inhibitors (PPIs): treat the acid component of mixed reflux
• sucralfate: coats and protects the stomach lining
• prokinetics: help the stomach empty faster, reducing time bile spends there

Lifestyle measures

These help mixed reflux and overall symptoms, though they rarely control bile reflux alone:

• eat smaller meals and avoid lying down for 2 to 3 hours afterward
• raise the head of the bed by 6 to 8 inches (15 to 20 cm)
• limit fatty foods, alcohol and carbonated drinks
• stop smoking
• maintain a healthy weight

Surgery

For severe symptoms that do not respond to medicines, especially after previous stomach surgery:

• Roux-en-Y diversion: reroutes the small intestine so bile drains well away from the stomach
• fundoplication for combined reflux in selected patients

Frequently asked questions

What are the symptoms of bile reflux?

Common symptoms are burning upper belly pain, heartburn, nausea, vomiting greenish-yellow bile, a bitter taste in the mouth, and sometimes cough, hoarseness or weight loss.

What is the difference between bile reflux and acid reflux?

Acid reflux is stomach acid flowing into the esophagus. Bile reflux is bile flowing from the small intestine back into the stomach and esophagus. Bile reflux is more common after stomach or gallbladder surgery and responds less well to acid-reducing medicines and diet changes.

What causes bile reflux?

The most common causes are stomach surgery that affects the pyloric valve, gallbladder removal, and peptic ulcers that scar the stomach outlet. It often occurs together with acid reflux.

How is bile reflux treated?

Treatment includes ursodeoxycholic acid, bile acid binders, stomach-protecting medicines, PPIs for any acid component, and lifestyle changes. Severe cases may need surgery to divert bile away from the stomach.