Selfcheck stomach ulcer test is a simple and reliable test to detect an infection of helicobacter pylori which is linked to stomach ulcers it is estimated that over half the worlds population is infected by the stomach bacterium helicobacter pylori h pylori causes conditions such as gastritis and ulcers untreated long term infection causes damage to the mucous membrane of the stomach and those infected with this bacterium have an increased risk of ulcers and developing stomach cancer however