헬리코박터 파일로리 (Helicobacter pylori) is a type of bacteria that lives in the stomach. It is known to cause various gastrointestinal issues, including 위염 (gastritis) and 소화성 궤양 (peptic ulcers). Many people carry this bacterium without experiencing symptoms, but it can lead to serious health problems in some cases. This bacterium is typically transmitted through contaminated food or water. Diagnosis can be made through breath, stool, or endoscopic tests. Treatment usually involves a combination of antibiotics and acid-reducing medications to eliminate the bacteria and promote healing of the stomach lining.