There are also several forms of chronic gastritis. Type A (Autoimmune gastritis) gastritis is a rare hereditary autoimmune disease. What this rare form of gastritis results from is still largely unknown. Scientists suspect that the immune system does not function properly and attacks the body's own gastric mucosa, gradually destroying it.
Type B (bacterial) is much more common than Type A: This type of gastritis is caused by infection with the bacterium Helicobacter pylori. The bacterium spreads by smear infections, meaning from person to person, for example when shaking hands or over contaminated objects. Other bacteria can also cause type B gastritis, but this is often not the case. Type B gastritis usually affects the area around the end of the stomach, the antrum, and is therefore also referred to as antral gastritis.
Type C gastritis, also known as chemical-toxic gastritis, occurs in people who frequently ingest stomach irritants. Certain pain or rheumatism medicines can cause long-term damage to the stomach. These include ibuprofen, acetylsalicylic acid and diclofenac. Those who take such medications regularly should pay close attention to the package leaflet or better still consult a physician. They often can prescribe a parallel therapy to protect the stomach lining.
In addition to these three forms of gastritis, there are other rare manifestations such as ménétrier gastritis. This is a gastric disease that is associated with an enlargement of the mucosal folds of the stomach and is therefore also called giant fold gastritis. The exact cause is still unknown.
The rather uncommon type D gastritis also has different triggers, for example, chronic inflammatory gastrointestinal diseases such as Crohn's disease, also known as Crohn’s gastritis.