How do you get H. pylori?

Although it is still not known exactly how H. pylori bacteria is transmitted, it may be contracted by ingesting infected food and water, according to WebMD. Commonly associated with low-grade inflammation of the stomach and gastrointestinal tract, the bacteria has infected approximately 50 percent of the world's population, says eMedicineHealth.

According to Mayo Clinic, most people with the bacteria do not have any symptoms. Those who become symptomatic often complain of common stomach ailments, such as upset stomach, nausea, loss of appetite, gas, bloating and weight loss. Fortunately, a simple blood test diagnoses H. pylori, and it can be treated with antibiotics.