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Helicobacter Pylori

What is a peptic ulcer?

A peptic ulcer is a sore on the lining of the stomach, or in the duodenum, which is the beginning of the small intestine. Peptic ulcers are common: One in 10 Americans develops an ulcer at some time in his or her life. One cause of a peptic ulcer is a bacterial infection, but some ulcers are caused by long-term use of nonsteroidal anti-inflammatory agents (NSAIDs), like aspirin and ibuprofen. In a few cases, cancerous tumors in the stomach or pancreas can cause ulcers. Peptic ulcers are not caused by stress or eating spicy food, but these can make ulcers worse.

What is H. pylori?

Helicobacter pylori (H. pylori) is a type of bacteria. Researchers believe that H. pylori is responsible for the majority of peptic ulcers.

H. pylori infection is common in the United States: About 20 percent of people under 40 years old and half of those over 60 years have it. Most infected people, however, do not develop ulcers. Why H. pylori does not cause ulcers in every infected person is not known. Most likely, infection depends on characteristics of the infected person, the type of H. pylori, and other factors yet to be discovered.

Researchers are not certain how people contract H. pylori, but they think it may be through food or water.

How does H. pylori cause a peptic ulcer?

H. pylori weakens the protective mucous coating of the stomach and duodenum, which allows acid to get through to the sensitive lining beneath. Both the acid and the bacteria irritate the lining and cause a sore, or ulcer.

H. pylori is able to survive in stomach acid because it secretes enzymes that neutralize the acid. This mechanism allows H. pylori to make its way to the "safe" area—the protective mucous lining. Once there, the bacterium's spiral shape helps it burrow through the lining.

What are the symptoms of an ulcer?

Abdominal discomfort is the most common symptom. This discomfort usually:

  • is a dull, gnawing ache
  • comes and goes for several days or weeks
  • occurs 2 to 3 hours after a meal
  • occurs in the middle of the night (when the stomach is empty)
  • is relieved by eating
  • is relieved by antacid medications

Other symptoms include

  • weight loss
  • poor appetite
  • bloating
  • burping
  • nausea
  • vomiting

Some people experience only very mild symptoms, or none at all.

Emergency Symptoms

If you have any of these symptoms, call your doctor right away:

  • sharp, sudden, persistent stomach pain
  • bloody or black stools
  • bloody vomit or vomit that looks like coffee grounds

They could be signs of a serious problem, such as

  • perforation—when the ulcer burrows through the stomach or duodenal wall
  • bleeding—when acid or the ulcer breaks a blood vessel
  • obstruction—when the ulcer blocks the path of food trying to leave the stomach

How is an H. pylori-related ulcer diagnosed?

Diagnosing an Ulcer
To see whether symptoms are caused by an ulcer, the doctor may do an upper gastrointestinal (GI) series or an endoscopy. An upper GI series is an x ray of the esophagus, stomach, and duodenum. The patient drinks a chalky liquid called barium to make these organs and any ulcers show up more clearly on the x ray.

An endoscopy is an exam that uses an endoscope, a thin, lighted tube with a tiny camera on the end. After anesthesia is administered, the doctor carefully eases the endoscope into the mouth and down the throat to the stomach and duodenum. This allows the doctor to see the lining of the esophagus, stomach, and duodenum. The doctor can use the endoscope to take photos of ulcers or remove a tiny piece of tissue to view under a microscope. This procedure is called a biopsy. If an ulcer is bleeding, the doctor can use the endoscope to inject drugs that promote clotting or to guide a heat probe that cauterizes the ulcer.

Diagnosing H. pylori
If an ulcer is found, the doctor will test the patient for H. pylori. This test is important because treatment for an ulcer caused by H. pylori is different from that for an ulcer caused by NSAIDs.

H. pylori is diagnosed through blood, stool, breath, and tissue tests. Blood tests are commonly used. They detect antibodies to H. pylori bacteria. Unfortunately, blood tests only detect previous exposure to the bacteria, and are unable to definitively diagnose active infection.

Stool tests may be used to detect H. pylori infection in the patient's fecal matter. Studies have shown that this test, called the Helicobacter pylori stool antigen (HpSA) test, is accurate for diagnosing H. pylori.

Tissue tests are usually done using the biopsy sample that is removed with the endoscope. There are two types:

  • The rapid urease test detects the enzyme urease, which is produced by H. pylori.
     
  • A histology test allows the doctor to find and examine the actual bacteria.
     

How are H. pylori peptic ulcers treated?

Drugs Used to Treat H. pylori Peptic Ulcers

Antibiotics: metronidazole, tetracycline, clarithromycin, amoxicillin

H2 blockers: cimetidine, ranitidine, famotidine, nizatidine

Proton pump inhibitors: omeprazole, lansoprazole, rabeprazole, esomeprazole, pantoprozole

Stomach-lining protector: bismuth subsalicylate

H. pylori peptic ulcers are treated with drugs that kill the bacteria, reduce stomach acid, and protect the stomach lining. Antibiotics are used to kill the bacteria. Two types of acid-suppressing drugs might be used: H2 blockers and proton pump inhibitors.

H2 blockers work by blocking histamine, which stimulates acid secretion. They help reduce ulcer pain after a few weeks. Proton pump inhibitors suppress acid production by halting the mechanism that pumps the acid into the stomach. H2 blockers and proton pump inhibitors have been prescribed alone for years as treatments for ulcers. But used alone, these drugs do not eradicate H. pylori and therefore do not cure H. pylori-related ulcers. Treatment usually involves a combination of antibiotics, acid suppressors, and stomach protectors. Antibiotic regimens recommended for patients may differ across regions of the world because different areas have begun to show resistance to particular antibiotics.

The use of only one medication to treat H. pylori is not recommended. At this time, the most proven effective treatment is a 2-week course of treatment called triple therapy. It involves taking two antibiotics to kill the bacteria and either an acid suppressor or stomach-lining shield. Two-week triple therapy reduces ulcer symptoms, kills the bacteria, and prevents ulcer recurrence in more than 90 percent of patients.

Unfortunately, patients may find triple therapy complicated because it involves taking as many as 14 pills a day. Also, the antibiotics used in triple therapy may cause mild side effects such as nausea, vomiting, diarrhea, dark stools, metallic taste in the mouth, dizziness, headache, and yeast infections in women. (Most side effects can be treated with medication withdrawal.) Nevertheless, recent studies show that 2 weeks of triple therapy is ideal.

Can H. pylori infection be prevented?

No one knows for sure how H. pylori spreads, so prevention is difficult. Researchers are trying to develop a vaccine to prevent infection.

Why don't all doctors automatically check for H. pylori?

Changing medical belief and practice takes time. For nearly 100 years, scientists and doctors thought that ulcers were caused by stress, spicy food, and alcohol. Treatment involved bed rest and a bland diet. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids.

Since H. pylori was discovered in 1982, studies conducted around the world have shown that using antibiotics to destroy H. pylori cures peptic ulcers. The prevalence of H. pylori ulcers is changing. The infection is becoming less common in people born in developed countries. The medical community, however, continues to debate H. pylori's role in peptic ulcers. If you have a peptic ulcer and have not been tested for H. pylori infection, talk to your doctor.

Points to Remember

  • A peptic ulcer is a sore in the lining of the stomach or duodenum.
  • The majority of peptic ulcers are caused by the H. pylori bacterium. Many of the other cases are caused by NSAIDs. None are caused by spicy food or stress.
  • H. pylori can be transmitted from person to person through close contact.
  • A combination of antibiotics and other drugs is the most effective treatment for H. pylori peptic ulcers.

Reprinted and edited from The National Digestive Diseases Information Clearinghouse. The U.S. Government does not endorse or favor any specific commercial product or company. Trade, proprietary, or company names appearing in this document are used only because they are considered necessary in the context of the information provided. If a product is not mentioned, the omission does not mean or imply that the product is unsatisfactory.

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