Chronic gastritis is one of the common upper gastrointestinal diseases, which is usually divided into two main categories under gastroscopy. One is chronic non-atrophic gastritis, also known as chronic superficial gastritis; the other is chronic atrophic gastritis. The principal cause of these types of gastritis is likely infection by Helicobacter pylori. In addition, stimulants like smoking and alcohol, and inappropriate dietary habits are also contributing factors. As for the transmission of gastritis, it is not appropriate to say that gastritis itself is contagious, as the main cause is Helicobacter pylori infection, which means the transmission involved is due to the bacteria. Helicobacter pylori is a bacterium that resides in areas like the anterior gastric antrum and the oral cavity, and can be transmitted through dietary means, such as through saliva and shared utensils.