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H. Pylori Infection

H. pylori is a common stomach bacterium that inflames the stomach lining and causes most peptic ulcers; it is diagnosed with breath, stool, or biopsy tests and cured with combination therapy.

Gastrointestinal
Helicobacter pylori (H. pylori) is a spiral-shaped bacterium that infects the lining of the stomach. It is one of the most common chronic bacterial infections in the world — roughly half of the global population carries it, usually acquired in childhood — and most people never develop symptoms. In some, however, the infection inflames the stomach lining and causes ulcers, so identifying and eliminating it can prevent real problems.

How It Spreads

H. pylori passes from person to person, most often within families and households, through saliva, vomit, or stool, and through contaminated food or water. Infection rates are higher where sanitation is limited, and most infections are picked up in childhood and persist silently for decades unless treated. There is no vaccine, but good hand washing and careful food and water handling reduce spread within a household, and reinfection after successful treatment is uncommon in adults.

Symptoms and Related Conditions

Most people with H. pylori have no symptoms at all. When the infection causes trouble, it does so mainly through inflammation and ulcers:
  • Gastritis: H. pylori is the most common cause of chronic gastritis, inflammation of the stomach lining.
  • Peptic ulcers: Together with NSAID use, H. pylori accounts for the great majority of peptic ulcer disease. Typical symptoms include gnawing or burning upper abdominal pain that may change with eating, bloating, nausea, early fullness, and loss of appetite.
  • Iron and B12 problems: Long-standing infection can contribute to iron-deficiency anemia and reduced vitamin B12 absorption.
  • Stomach cancer risk: Decades of untreated infection modestly increase the risk of stomach cancer, which is one reason confirmed infections are treated even when symptoms are mild.
An ulcer can develop even decades after the infection was first acquired, so a remote childhood exposure still matters.

Diagnosis

Testing is recommended for people with ulcers, ongoing dyspepsia, unexplained iron-deficiency anemia, or a family history of stomach cancer. Accurate, noninvasive options include:
  • Urea breath test: You drink a special solution and breathe into a collection device; the bacterium's enzyme activity is detected in your breath.
  • Stool antigen test: Detects H. pylori proteins in a stool sample.
  • Endoscopic biopsy: When an upper endoscopy is being done anyway, small samples of the stomach lining can be tested directly.
Acid-reducing medicines and recent antibiotics can cause false-negative results, so your doctor may ask you to pause certain medications before breath or stool testing.

Treatment

H. pylori is curable, but no single drug eliminates it — treatment always combines medications for about two weeks:
  • Combination therapy: A proton pump inhibitor such as omeprazole plus two or more antibiotics — commonly amoxicillin with clarithromycin, or regimens using metronidazole; bismuth-based four-drug regimens are another first-line choice, especially where antibiotic resistance is a concern.
  • Finish every dose: Stopping early is the main reason treatment fails and encourages resistant bacteria. Side effects such as a metallic taste or loose stools are common but usually mild and temporary.
  • Confirm the cure: A repeat breath or stool test at least four weeks after finishing antibiotics verifies the infection is gone; persistent infection is retreated with a different regimen.

When to Seek Immediate Care

Black tarry stools, vomiting blood or material that looks like coffee grounds, severe abdominal pain, or lightheadedness can signal a bleeding ulcer and require emergency care. If you have persistent stomach discomfort or a history of ulcers, testing for H. pylori is simple and treatment is highly effective. Schedule an appointment with Zimmer Medical Group to discuss testing and treatment.

Getting H. pylori Treatment Right

H. pylori is curable in most people on the first attempt, and most failures trace back to a few avoidable things: a test masked by an acid blocker, a regimen the bacterium was already resistant to, missed doses, and no test of cure afterward.

Before the test: what to stop

Proton pump inhibitors such as omeprazole or pantoprazole suppress the bacterium enough to produce a false-negative breath or stool test, so they are stopped about two weeks beforehand, and any antibiotic or bismuth product about four weeks beforehand. A histamine blocker or antacid can cover heartburn in the meantime. The same rule applies to the test of cure, which is done at least four weeks after the last antibiotic dose.

Why the regimen has changed

Resistance to clarithromycin is now common enough that the old triple therapy fails a large share of the time, particularly in anyone who has taken a macrolide antibiotic for any reason in the past. Current guidance favors bismuth quadruple therapy for fourteen days, a proton pump inhibitor with bismuth, metronidazole, and tetracycline, or a newer regimen built on the acid blocker vonoprazan. Amoxicillin-based regimens remain useful because resistance to it is rare. Our antibiotic resistance guide explains why the history of prior antibiotics matters so much here.

Getting through fourteen days

Quadruple therapy means a dozen or more pills a day, and the cure rate falls when doses are skipped, so a pill organizer and alarms are worth setting up on day one. Bismuth turns the stool black and harmless, which is easily mistaken for bleeding; metronidazole with alcohol causes flushing and vomiting, so alcohol waits until the course is done; tetracycline makes skin burn quickly in the Florida sun. Nausea and a metallic taste are expected and fade. Call before stopping for side effects rather than after.

If the first course fails

A positive test of cure means a different regimen, never a repeat of the same one, and clarithromycin is not reused. Options include a levofloxacin-based course, a rifabutin-based combination, or a regimen chosen after culture and resistance testing from an endoscopic biopsy. Reinfection after a confirmed cure is uncommon, so a later positive test usually means the first treatment never fully worked. Our gastrointestinal team coordinates retreatment with gastroenterology.

What it is confused with, and what continues afterward

Persistent burning after cure is more often reflux or functional dyspepsia than surviving infection, and pain after fatty meals points to gallstones. An ulcer also needs ibuprofen and naproxen stopped and a proton pump inhibitor continued for several weeks after the antibiotics finish; our long-term PPI use article covers when to stop it. Unexplained iron-deficiency anemia and vitamin B12 deficiency are rechecked after treatment, and our H. pylori and peptic ulcers article explains who else in a household should be tested. The NIDDK and MedlinePlus publish patient guidance on testing and treatment.

If you were treated for H. pylori and never had a test of cure, or your symptoms have returned, schedule a visit.

Frequently Asked Questions

Yes. Proton pump inhibitors such as omeprazole and pantoprazole suppress the bacterium enough to cause a false-negative breath or stool test, so they are stopped about two weeks beforehand, and antibiotics and bismuth products about four weeks beforehand. A histamine blocker or antacid can manage heartburn in the meantime. The same rule applies to the test of cure after treatment.
Only by retesting. A urea breath test or stool antigen test at least four weeks after the last antibiotic dose, and two weeks off any proton pump inhibitor, confirms the infection is gone. Feeling better is not proof, because symptoms often ease while some bacteria survive. A positive result means a different regimen, since repeating the same one rarely succeeds.
Because clarithromycin resistance has made the older three-drug course unreliable. Bismuth quadruple therapy, a proton pump inhibitor with bismuth, metronidazole, and tetracycline for fourteen days, cures most infections even when the bacterium is resistant to clarithromycin. The pill burden is high, and missed doses lower the cure rate, so a pill organizer and alarms are worth setting up from the first day.
Usually not. Bismuth, part of quadruple therapy, turns the stool black and sometimes darkens the tongue, and both clear within days of finishing. Bleeding from an ulcer produces tarry, sticky, foul-smelling stool, often with dizziness, vomiting blood or coffee-ground material, or abdominal pain. Any of those, or black stool that continues after the bismuth stops, needs urgent evaluation.

Related Medications

Commonly prescribed medications for this condition

AmoxicillinClarithromycinMetronidazoleOmeprazoleRabeprazole

Getting Care in St. Petersburg

If you have questions about H. Pylori Infection, a primary care team in St. Petersburg can evaluate your symptoms, order the right tests, coordinate any specialist care, and follow up with you over time.

Request an appointment

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