H. pylori infection is asymptomatic in most people and symptomatic in some. Symptoms can manifest as pain in the upper abdomen, upper abdominal discomfort, morning sickness, belching, hunger, and a bad taste in the mouth. Helicobacter pylori causes stomach disease, the symptoms appear differently depending on the site of involvement and the resulting disease, the common symptoms are: 1. Peptic ulcer: epigastric pain, epigastric discomfort is common. In gastric ulcer, postprandial pain or postprandial epigastric fullness and discomfort, bloating, burping, and fasting relief can occur; stomach pain is the most typical symptom of gastric ulcer. For duodenal bulb ulcer, fasting pain, nighttime pain and postprandial relief may occur; periodic abdominal pain or more regular abdominal pain should be taken seriously. 2, bloating and other indigestion symptoms are mostly seen in patients with H. pylori-associated gastritis. 3, bad breath: H. pylori is one of the direct germs that cause bad breath, because H. pylori can live in dental plaque, will directly produce smelly carbons, causing bad breath. The discovery of regular bad breath requires timely examination at the hospital to confirm the cause. Some severe patients have systemic symptoms like weakness, anemia, and even wasting these symptoms. Early detection and treatment are needed.