H. pylori: symptoms, testing and stomach ulcers (UK guide)

Stomach discomfort can make it tempting to look for one clear explanation. H. pylori is an important possible cause, but testing for the bacterium is different from finding out whether you have an ulcer. This guide explains the distinction, compares the testing routes and shows how to discuss a result with a clinician. If you are vomiting blood, passing black sticky stools or have severe abdominal pain, get urgent help rather than starting with a home test.

What is H. pylori?

Helicobacter pylori is a bacterium that can live in the stomach lining. Many people carrying it have no obvious symptoms. The infection causes inflammation of the stomach lining and can contribute to ulcers. Guts UK: Helicobacter pylori

The name describes an infection, not a symptom or a particular level of stomach acid. It is possible to have indigestion for another reason, even when H. pylori is also present. Equally, the absence of pain cannot tell you whether you carry the bacterium.

This distinction matters when deciding what a test is meant to answer. A screen can provide information about H. pylori. It cannot inspect the stomach lining, identify every cause of upper abdominal pain or show whether a sore has healed. Those questions may require a clinical assessment and, sometimes, other investigations.

How do people get H. pylori?

Infection is often acquired during childhood and can persist if it is not treated. It can spread between people, but the source of an individual infection is usually not clear. Guts UK: Helicobacter pylori

A result cannot establish when you acquired it, who passed it to you or whether a partner has it. It should not be used to draw conclusions about a recent relationship or someone's cleanliness. If you are concerned about household transmission, ask your GP what advice is relevant to your circumstances.

Routine hygiene remains sensible, including handwashing after using the toilet and before preparing food. A whole household should not start treatment based on one person's home result. Each person needs an appropriate assessment, and antibiotics should only be used under the direction of a prescriber.

What symptoms can H. pylori cause?

H. pylori can be present without symptoms. When stomach inflammation or an ulcer causes symptoms, these may include upper abdominal pain, indigestion, bloating or nausea. None identifies H. pylori on its own. NHS: Stomach ulcer; NHS: Gastritis; Guts UK: Helicobacter pylori

Notice whether discomfort is recurring, whether you feel full unusually quickly and whether symptoms affect eating or sleep. Also record medicines you use, including painkillers bought without a prescription. These details help a clinician consider other explanations and decide which investigation is useful.

Avoid self-diagnosing from pain location or a symptom checklist. A home screen should not be used to decide that persistent vomiting, unexplained weight loss or difficulty swallowing is simply indigestion. See your GP for persistent or recurring symptoms; ask for urgent GP help or NHS 111 if symptoms are worsening or include those warning signs. NHS: Stomach ulcer; NHS: Gastritis

How are H. pylori, gastritis and ulcers different?

H. pylori is a bacterium, gastritis is inflammation of the stomach lining, and an ulcer is a sore in the lining of the stomach or duodenum. The conditions can be related, but the terms are not interchangeable. NHS: Stomach ulcer; NHS: Gastritis; Guts UK: Helicobacter pylori

Regular use of anti-inflammatory painkillers is another important cause of ulcers. A negative H. pylori result therefore does not exclude an ulcer. Discuss ongoing pain with your GP even if a screen appears reassuring, and seek urgent help for signs of bleeding. NHS: Stomach ulcer

Where is stomach ulcer pain usually felt?

Ulcer pain is often felt in the upper abdomen and can have a burning quality, but location and timing cannot diagnose an ulcer. Other digestive and non-digestive problems can cause pain in that area. NHS: Stomach ulcer

Write down where the pain is, how long it lasts and whether it is linked to meals or wakes you at night. Describe the impact rather than trying to match an online description exactly. Tell the clinician about vomiting, bowel changes, difficulty swallowing or unintentional weight loss.

Do not assume that severe chest or abdominal pain is an ulcer because you have had indigestion before. See your GP if pain keeps coming back. Ask for urgent help if it worsens or does not settle; call 999 or go to A&E for sudden severe pain or vomiting blood, rather than waiting to use a test. NHS: Stomach ulcer; NHS: Gastritis

Which H. pylori tests are available?

Clinicians commonly use stool antigen or breath testing to investigate current H. pylori infection. Other tests have different roles, so the choice depends on the clinical question and what has happened before. Guts UK: Helicobacter pylori; NICE: Dyspepsia and reflux: recommendations

The U-Test kit screens for H. pylori and gives a result in about 10 minutes according to the product information. It does not diagnose an ulcer or confirm the cause of discomfort. Ask your GP about persistent symptoms and the most appropriate route.

Can medicines affect an H. pylori test?

Yes. Acid-suppressing medicines and recent antibiotics can affect some H. pylori investigations, so tell the testing service what you take before collecting a sample. NICE: Dyspepsia and reflux: recommendations

NICE specifies a two-week washout after a proton pump inhibitor before a stool antigen or breath test. That is a clinical preparation issue to agree with the clinician who manages your medicine. It is not advice to stop a prescribed medicine yourself, particularly if you have had bleeding or another significant problem.

Give the service the medicine names and when you last took them, including recent antibiotics. Ask whether the appointment or sample collection should be moved. The instructions for a particular rapid home kit also matter: do not assume that a laboratory preparation sheet describes every step for a different device.

How should you collect and read a home sample?

Use the leaflet supplied with the exact kit for collection, sample quantity, handling and the result window. General online instructions should not replace that leaflet.

Before starting, check the expiry date, read through all the steps and make sure the components are present. Arrange a clean area and a way to time the reading. Keep the test away from children and follow the kit's disposal guidance. If a component is missing or damaged, contact the supplier before using it.

The result is only meaningful if the required control and reading conditions are satisfied. Do not interpret a photograph taken long after the reading window or use another brand's line chart. If the result is unclear, seek product support and ask your GP about symptoms rather than treating an uncertain screen as reliable.

What does a positive home result mean?

A positive home reading is a screening indication to discuss with your GP. It is not a diagnosis of an ulcer, gastritis or cancer, and does not tell you which medicine to take.

Tell the clinician the test name, date, result and any preparation issues. They may assess whether further testing is needed and consider symptoms, previous treatment, allergies and other medicines. If prescribed treatment is appropriate, the clinician should explain the plan and follow-up.

There is no need to interpret a positive result as the worst possible outcome. The useful next step is a clinical conversation, not searching for increasingly serious explanations. Contact your GP about the result, and obtain urgent medical advice if you have weight loss, persistent vomiting, difficulty swallowing or worsening pain. Call 999 or go to A&E for vomiting blood, black sticky stools or severe abdominal pain. NHS: Stomach ulcer; NICE: Dyspepsia and reflux: recommendations

What if the result is negative but pain continues?

A negative screen does not exclude all infection or other stomach conditions. Medicines, sample handling and the limitations of the test can affect interpretation, while symptoms may have a different cause. NHS: Stomach ulcer; NICE: Dyspepsia and reflux: recommendations

Tell your GP if you tested while taking a PPI or after antibiotics. Do not repeatedly buy tests to decide whether you deserve an appointment. Persistent symptoms themselves are a reason to seek advice, and a clinician may choose a different investigation or assess for an ulcer, reflux or another problem.

Keep the result in context: it answers a limited screening question at one time. See your GP if discomfort persists or returns, even with a negative reading. Call NHS 111 or seek urgent GP help for worsening symptoms, difficulty swallowing or ongoing vomiting; call 999 or go to A&E for vomiting blood, black sticky stools or severe sudden pain. NHS: Stomach ulcer; NHS: Gastritis

How is H. pylori treated and checked afterwards?

H. pylori treatment is prescribed after an appropriate assessment, usually using antibiotics with an acid-suppressing medicine. Treatment choice should take account of allergies, previous antibiotic exposure and local guidance. Guts UK: Helicobacter pylori; NICE: Dyspepsia and reflux: recommendations

Ask the prescriber how to take the medicines, what to do if side effects occur and whether a follow-up test is needed. Follow-up testing needs its own timing and preparation; taking a rapid screen immediately after treatment is not a useful substitute for the agreed plan.

If symptoms continue, it does not automatically mean that treatment failed, and improvement does not prove the infection cleared. Contact the prescribing service rather than repeating leftover medicines. Our iron deficiency guide also explains why unexplained low iron stores may need investigation of the cause, including possible digestive blood loss. NHS: Iron deficiency anaemia