Gastritis is a sudden or gradual erosion, inflammation or irritation of the stomach lining. Many factors contribute to gastritis, including excessive alcohol use, chronic vomiting, stress or the use of anti-inflammatory drugs. Infections caused by bacteria or viruses are also causes.

Some people may not experience gastritis symptoms, but common symptoms include: Recurrent upset stomach or nausea, abdominal pain or bloating, indigestion, vomiting or burning feeling in between meals. Loss of appetite and black, tarry stools can also occur.