Pyloric stenosis is a problem that causes forceful vomiting. It affects babies from birth to 6 months of age. It can lead to dehydration. This condition is the second most common reason why newborns have surgery.

Pancreatitis is the redness and swelling (inflammation) of the pancreas. This happens when digestive juices or enzymes attack the pancreas.

A peptic ulcer is a sore on the lining of your stomach or the first part of your small intestine (duodenum).

Peritonitis is a redness and swelling (inflammation) of the tissue that lines your belly or abdomen. This tissue is called the peritoneum.

Portal hypertension is high blood pressure of the portal vein, which is in your abdomen. It collects nutrient-rich blood from your intestines and carries it to the liver for cleaning.