Gastritis by itself is rarely a serious problem. Gastritis is an inflammation of the lining of your stomach. Gastritis is not a single disease, but several different conditions that all have inflammation of the stomach lining. The inflammation of gastritis is often the result of infection with the same bacterium that causes most stomach ulcers. However, other factors — such as traumatic injury, regular use of certain pain relievers or drinking too much alcohol — also can contribute to gastritis.
Gastritis may occur suddenly (acute gastritis) or it can occur slowly over time (chronic gastritis). In some cases, gastritis can lead to ulcers and an increased risk of stomach cancer. For most people, however, gastritis isn’t serious and improves quickly with treatment.