Helicobacter pylori is a Gram-negative bacterium, which was first isolated by Marshall and Warren from the gastric mucosa of patients with gastritis and peptic ulcers. Helicobacter pylori is the main cause of chronic infection in gastric mucosa, affecting 50% of the world’s population. Recently, H. pylori has been shown to cause other complications, such as gastric ulcers, duodenal inflammation, and gastritis. According to the literature, a considerable proportion of patients, infected with H. pylori, may not develop gastroduodenal diseases and could remain asymptomatic for a long period. On the other hand, long-term infections raise the risk of conditions such as adenocarcinoma and gastric lymphoma.