The microbial origin of cancer is at present realized as one of the most important causes of developing cancer in human. And, recently, it appears that the same subject has been found to be discussed in much detail by the microbial oncologists as one of the causes of cancer development. Barry Marshal and Robin Warren have investigated a similar carcinogenic bacteria named Helicobacter pylori developing cancer in human stomach. The present paper is an attempt to review the recent trends in researches carried on in the field of H. pylori infections and their magnifications of developing a variety of cancers in human for the last 15 years.