Helicobacter pylori related diseases include chronic gastritis, peptic ulcer, gastric cancer, etc., which need to be clearly diagnosed through gastroscopy, urea breath test, X-ray barium meal and other tests. 1. Chronic gastritis: generally lack of specific symptoms, mainly through gastroscopy to take gastric mucosa biopsy to confirm the diagnosis, for H. pylori examination (such as urea breath test, rapid urease test) to help the diagnosis of the cause of the disease. 2. Peptic ulcer: gastroscopy is the first choice, followed by X-ray barium meal, in which gastric ulcer usually manifests as postprandial epigastric pain, while duodenal ulcer manifests as nocturnal hunger pain. Most of them are caused by Helicobacter pylori infection, and Helicobacter pylori needs to be eradicated at the same time of treating ulcers. 3. Gastric cancer: The first choice of examination for gastric cancer is gastroscopy + biopsy of gastric mucosa, and patients show weight loss, pain and anemia. If you feel long-term stomach discomfort, abdominal pain, bloating, loss of appetite and other symptoms, it is recommended to go to the hospital as soon as possible to find out the specific cause of the disease and then carry out targeted treatment.