Sometimes brain tumors start in the lung, breast, skin, kidney, or other body parts and spread to the brain. These are called secondary or metastatic brain tumors.

Gastroenteritis is when the stomach and intestines become inflamed. When it's caused by a type of bacteria, it’s called bacterial gastroenteritis.

The term annular pancreas means that a ring of excess pancreatic tissue encases the first part of your small intestine. Your pancreas can still function, but the excess tissue can cause a number of symptoms. Read on to learn more.

Pancreatitis is inflammation of the pancreas. It can be caused by gallstones, alcohol consumption, and certain medicines, among other causes.

If you're like most people, you may have gas, constipation, or heartburn every now and then.

Many people are reducing or eliminating their dietary intake of gluten, a protein found in wheat, rye, barley, and some other grains. But only those who have celiac disease need to completely stop eating gluten.

Celiac disease is a digestive disorder that damages your small intestine and keeps it from absorbing the nutrients in food. A protein found in wheat, barley, and rye called gluten is what causes the damage to the intestinal tract.

Your bile and pancreative juices flow through a duct that is opened and closed by a valve called the sphincter of Oddi. If this valve goes into spasm, you end up with severe belly pain.

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

Pancreas transplantation is a type of surgery in which you receive a healthy donor pancreas. It is an option for some people with type 1 diabetes.