Helicobacter pylori is contagious and can be transmitted through the oral-oral or fecal-oral route. Most patients do not have any symptoms after infection, but some patients may have nausea, belching and other digestive symptoms. 1. Transmission: Oral-oral transmission: sharing tableware, mouth-to-mouth feeding, kissing and other close contact with infected people can be infectious; fecal-oral transmission: drinking contaminated water or touching the vomit and fecal matter of infected people, as well as eating without washing hands, can also lead to infection. 2. Symptoms: After infection, most patients often have no obvious symptoms, and some symptomatic patients may have anorexia, nausea, belching, bloating, acid reflux and heartburn. If timely intervention is not possible, gastritis, peptic ulcer, gastric cancer and other diseases can develop gradually. Once diagnosed with H. pylori infection, it is recommended to seek medical treatment as soon as possible, regardless of whether symptoms occur.