Gastritis is not contagious, does not have any contagious, but cause gastritis Helicobacter pylori bacteria will appear infectious. Gastritis is often due to dietary inattention, resulting in gastric mucosa congestion and swelling, erosion, or even mucosal mild ulceration and lead to the emergence of gastritis, most of the gastritis and the patient’s diet has a great deal to do with the existence of, for example, eat some spicy and stimulating food, often smoke and drink, irregular diet, excessive stress caused by insomnia, anxiety, etc., can cause the onset of gastritis. There are also some people whose gastritis is caused by gastric Helicobacter pylori infection. H. pylori is a contagious germ, and if a person is infected with H. pylori, they may develop gastritis. However, gastritis itself is not contagious; it is the H. pylori bacteria that cause gastritis that are contagious.