Duodenitis is usually caused by bacteria called Helicobacter pylori (H pylori). The following can also lead to duodenitis: A bacterial, fungal, or viral infection. Severe illness or stress.

Can stress cause inflammation in stomach?

In more serious cases, stress may cause a decrease in blood flow and oxygen to the stomach, which could lead to cramping, inflammation, or an imbalance of gut bacteria. It can also exacerbate gastrointestinal disorders, including: Irritable bowel syndrome (IBS)

Why would your duodenum be inflamed?

The most common cause of duodenitis is infection by Helicobacter pylori (H. pylori) bacteria. Another common cause is long-term use of NSAIDs (such as aspirin and ibuprofen). Celiac disease, an allergy to gluten, causes a particular type of inflammation in the duodenum along with other changes.