Bile Reflux (DGER) – an often overlooked component of reflux disease

The upward movement of bile acids is present in many reflux patients—often in a latent and unnoticed form. Initially, bile flows from the duodenum into the stomach. If it reaches the esophagus, this is referred to as DGER (duodeno-gastro-esophageal reflux).

What happens in the body?

Our digestive system consists of clearly separated functional compartments:

• Stomach: strongly acidic environment (pH 1–2)

• Duodenum: alkaline environment (pH 8–8.5)

Bile plays a central role in maintaining this alkaline environment.

Here, the body makes use of a remarkable mechanism of self-regulation: SonntagIt cannot simply stop acid production in the stomach — but it can attempt to partially neutralize it using alkaline bile.

What happens in reflux?

This is exactly the mechanism the body uses. To protect the esophagus, the stomach allows increased backflow of bile, leading to a gradual neutralization of gastric acid.

In some cases, even alkaline pH levels can be reached within the stomach.

The price of this protective mechanism

The mixing of acidic and alkaline compartments disrupts the delicate acid–base balance of the gastrointestinal tract. As a result, the digestive system may develop various functional disturbances—including alterations in the intestinal microbiome.

Most importantly:

Bile acids behave differently in an acidic environment than they do in the duodenum:

• they can damage cell membranes

• they promote inflammatory processes

• they place additional stress on the mucosa of the stomach and esophagus

The consequences

In the stomach, this mechanism often leads to so-called C-gastritis, which is frequently observed in reflux patients.

If bile acids reach the esophagus, a double burden arises—acid and bile — significantly increasing the risk of cellular damage.

What does this mean for you?

Bile reflux is closely associated with reflux disease and should be taken seriously, particularly in cases of:

• chronic inflammation (e.g., C-gastritis)

• Barrett’s esophagus

The goal must be to avoid this double burden.

Conclusion

The dysfunction of the closure mechanism between the stomach and the esophagus is not merely a local problem. It has far-reaching — and often underestimated — effects on the entire organism.

Much of what occurs in detail is still not fully understood.