What is the difference between gastritis and gastroenteritis?

Gastritis is inflammation of the stomach lining alone, combining gastr meaning stomach and itis meaning inflammation. Common causes include Helicobacter pylori infection, excessive alcohol, and nonsteroidal anti-inflammatory drugs. Gastroenteritis is inflammation of both the stomach and intestines, combining gastr meaning stomach, enter meaning intestine, and itis meaning inflammation. It is commonly called the stomach flu and is usually caused by viral or bacterial infections.