A new study by researchers from the National Cancer Institute, Bethesda, Md., outlines the mixed role of the bacteria Helicobacter pylori in preventing and causing stomach cancers. According to the study, the presence if H. Pylori substantially increase the risk of cancer in the lower stomach, but it may decrease the risk of cancer near the junction between the esophagus and the stomach.

"Helicobacter pylori... is known to cause gastric and duodenal ulcers and also cancers of the lower part of the stomach," Dr. Farin Kamangar, lead author of the study, told Reuters Health

According to a study conducted in Taiwan, yogurt may help in eradicating the stomach ulcer causing bug.

The most common cause of the stomach ulcers is bacterium Helicobacter pylori, which doctors usually try to treat with antibiotic therapy. But in 10-23 percent cases the treatment fails

Two Australians wins the Nobel Prize for Medicine for revolutionary research on stomach ulcers. Their research invalidates conventional understanding they are caused by bacteria and can be cured with antibiotics.

The Nobel jury says Barry J. Marshall and J. Robin Warren "made the remarkable and unexpected discovery" in 1982 that gastritis and peptic ulcer disease are caused by the Helicobacter pylori bacterium. They had a tough time proving the theory