👉 Perienteritis is a condition where there is inflammation in the lining of your digestive tract, usually in your stomach. This can cause pain, bloating, and swelling when you eat or drink. It's often caused by an infection in the lining of your intestines, which can lead to other health issues like diarrhea, vomiting, and weight loss. If left untreated, perienteritis can be life-threatening if it spreads into other organs within the body.