Helicobacter pylori is a genus of bacteria that affects the human stomach. It is growing from the mucous layer thereof, secreting urease, an enzyme that converts urea (an important chemical compound metabolism) ammonia. Consequently, stomach acidity is neutralized and prone to pylori bacteria proliferation environment is created. It is transmitted through direct contact with an infected person and is characterized by severe abdominal pain, nausea, loss of appetite and weight or gases. Helicobacter pylori eradication as soon as your symptoms begin to sense to avoid further complications, such as abdominal infections, peritonitis, bleeding or ulcers is required; also can increase the risk of stomach cancer. Treatment includes antibiotics, to address or prevent infections; antiulcer drugs, to decrease the amount of acid produced in the stomach; and surgery, if the infection is caused ulcers. It is also important to follow, before the Helicobacter pylori, a proper diet, being recommended to increase fiber intake.