What is the definition of Helicobacter Pylori Infection?

Helicobacter pylori (H pylori) is a type of bacteria that infects the stomach. It is very common, affecting about two thirds of the world's population. H pylori infection is the most common cause of peptic ulcers. However, the infection does not cause problems for most people.

What are the alternative names for Helicobacter Pylori Infection?

H pylori infection

What are the causes for Helicobacter Pylori Infection?

H pylori bacteria are most likely passed directly from person to person. This tends to happen during childhood. The infection remains throughout life if not treated.

It's not clear how the bacteria are passed from one person to another. The bacteria may spread from:

  • Mouth-to-mouth contact
  • GI tract illness (particularly when vomiting occurs)
  • Contact with stool (fecal material)
  • Contaminated food and water

The bacteria may trigger ulcers in the following way:

  • H pylori enters the mucus layer of the stomach and attaches to the stomach lining.
  • H pylori cause the stomach to produce more stomach acid. This damages the stomach lining, leading to ulcers in some people.

Besides ulcers, H pylori bacteria can also cause a chronic inflammation in the stomach (gastritis) or the upper part of the small intestine (duodenitis).

H pylori can also sometimes lead to stomach cancer or a rare type of stomach lymphoma.

What are the symptoms for Helicobacter Pylori Infection?

About 10% to 15% of people infected with H pylori develop peptic ulcer disease. Small ulcers may not cause any symptoms. Some ulcers can cause serious bleeding.

An aching or burning pain in your abdomen is a common symptom. The pain may be worse with an empty stomach. The pain can differ from person to person, and some people have no pain.

Other symptoms include:

  • Feeling of fullness or bloating and problems drinking as much fluid as usual
  • Hunger and an empty feeling in the stomach, often 1 to 3 hours after a meal
  • Mild nausea that may go away with vomiting
  • Loss of appetite
  • Weight loss without trying
  • Burping
  • Bloody or dark, tarry stools or bloody vomit

What are the current treatments for Helicobacter Pylori Infection?

In order for your ulcer to heal and to reduce the chance it will come back, you will be given medicines to:

  • Kill the H pylori bacteria (if present)
  • Reduce acid levels in the stomach

Take all of your medicines as you have been told. Other lifestyle changes can also help.

If you have a peptic ulcer and an H pylori infection, treatment is recommended. The standard treatment involves different combinations of the following medicines for 10 to 14 days:

  • Antibiotics to kill H pylori
  • Proton pump inhibitors to help lower acid levels in the stomach
  • Bismuth (the main ingredient in Pepto-Bismol) may be added to help kill the bacteria

Taking all of these medicines for up to 14 days is not easy. But doing so gives you the best chance for getting rid of the H pylori bacteria and preventing ulcers in the future.

What is the outlook (prognosis) for Helicobacter Pylori Infection?

If you take your medicines, there is a good chance that the H pylori infection will be cured. You will be much less likely to get another ulcer.

Sometimes, H pylori can be hard to fully cure. Repeated courses of different treatments may be needed. A stomach biopsy will sometimes be done to test the germ to see which antibiotic might work best. This can help guide future treatment. In some cases, H pylori can't be cured with any therapy, though the symptoms may be able to be reduced.

If cured, reinfection may occur in areas where sanitary conditions are poor.


A long-term (chronic) infection with H pylori may lead to:

  • Peptic ulcer disease
  • Chronic inflammation
  • Gastric and upper intestine ulcers
  • Stomach cancer
  • Gastric mucosa-associated lymphoid tissue (MALT) lymphoma

Other complications may include:

  • Severe blood loss
  • Scarring from an ulcer may make it harder for the stomach to empty
  • Perforation or hole of the stomach and intestines

When should I contact a medical professional for Helicobacter Pylori Infection?

Severe symptoms that begin suddenly may indicate a blockage in the intestine, perforation, or hemorrhage, all of which are emergencies. Symptoms may include:

  • Tarry, black, or bloody stools
  • Severe vomiting, which may include blood or a substance with the appearance of coffee grounds (a sign of a serious hemorrhage) or the entire stomach contents (a sign of intestinal obstruction)
  • Severe abdominal pain, with or without vomiting or evidence of blood

Anyone who has any of these symptoms should go to the emergency room right away.

Esophagogastroduodenoscopy (EGD)
Location of peptic ulcers


Cover TL, Blaser MJ. Helicobacter pylori and other gastric Helicobacter species In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett’s Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 217.

Ku GY, Ilson DH. Cancer of the stomach. In: Niederhuber JE, Armitage JO, Kastan MB, Doroshow JH, Tepper JE, eds. Abeloff’s Clinical Oncology. 6th ed. Philadelphia, PA: Elsevier; 2020:chap 72.

Morgan DR, Crowe SE. Helicobacter pylori infection. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 51.

  • Condition: Helicobacter Pylori Infection
  • Journal: Arab journal of gastroenterology : the official publication of the Pan-Arab Association of Gastroenterology
  • Treatment Used: Vitamin D Added to Standard Clarithromycin-Based Triple Therapy
  • Number of Patients: 150
  • Published —
This study evaluated the effect of adding 1,25-hydroxyvitamin D3 to standard clarithromycin-based triple therapy for the treatment of patients with Helicobacter pylori infection.
  • Journal: Nigerian journal of clinical practice
  • Published —
Prevalence and risk factors for helicobacter pylori infection among children in Owerri, Nigeria.
Clinical Trial
  • Status: Enrolling by invitation
  • Phase: Phase 4
  • Intervention Type: Drug
  • Participants: 1000
  • Start Date: December 20, 2020
A Real World Study of Bismuth Colloidal Pectin Granules Quadruple Therapy for H. Pylori Eradication
Clinical Trial
  • Status: Not yet recruiting
  • Participants: 100
  • Start Date: June 2021
Investigation on Diagnosis and Treatment of Helicobacter Pylori Infection by Gastroenterologists in Shandong Province