Stomach Problems on Ultrasound — What It Can and Cannot See

This is the question that brings most people to this page, and the honest answer matters. Ultrasound is not the test that diagnoses gastritis. Gastritis — inflammation of the stomach lining — is confirmed by gastroscopy (endoscopy), where a camera examines the lining directly and small samples can be taken. On ultrasound, the stomach is a gas-filled organ, and gas blocks sound waves, so the lining cannot be assessed reliably. Occasionally an ultrasound shows thickening of the stomach wall that raises suspicion — but a normal ultrasound does not rule gastritis out, and an abnormal one still needs endoscopy to confirm.

So why scan at all if gastritis is suspected? Because the symptoms of gastritis — upper abdominal pain, discomfort after eating, bloating, nausea — overlap heavily with conditions ultrasound assesses very well: gallstones, biliary problems, fatty liver, pancreatic inflammation and kidney stones. An abdominal ultrasound is often the sensible first step precisely because it can identify or exclude these look-alike causes quickly and without radiation, helping your GP decide whether endoscopy is the right next test.

Can ultrasound detect H. pylori? No. Helicobacter pylori — the bacterium behind many cases of gastritis and stomach ulcers — cannot be seen on any ultrasound scan. It is diagnosed with a urea breath test or a stool antigen test, both usually arranged through your GP, and treated with a course of antibiotics if positive. If your symptoms are persistent, or you have red-flag features such as unintentional weight loss, difficulty swallowing, vomiting blood or black stools, see your GP promptly rather than booking a scan first.

Bowel gas is the big one: gas scatters sound, which is why the stomach lining and much of the bowel are out of reach, and why the pancreas can be partly hidden. Body habitus matters — sound attenuates through deeper tissue, reducing image quality. Bone blocks sound entirely, so structures behind ribs need careful windows. And ultrasound is operator-dependent: the scan is only as good as the person performing and interpreting it, which is why our sonographers’ HCPC numbers are published for you to check.

Finally, ultrasound can find an abnormality without fully characterising it — some findings need CT, MRI or endoscopy to confirm. For persistent, unexplained upper abdominal pain where standard imaging has drawn a blank, specialised endoscopic ultrasound (EUS, arranged through a gastroenterologist) has a higher diagnostic yield — particularly for bile-duct stones, gallbladder microlithiasis and early chronic pancreatitis. An honest report tells you which of these next steps, if any, your findings warrant — and our reports are written exactly that way.

The reverse pattern matters just as much: a completely normal scan in someone convinced something is seriously wrong. A normal abdominal ultrasound genuinely excludes the major gallbladder, liver, kidney and aortic causes — and documents that exclusion for your GP, so the next step (often an endoscopy question) starts from evidence rather than another round of guessing.

These are generalised patterns from our imaging casebook, not individual cases. Findings are always discussed with you at your scan, and anything needing further assessment is set out in your written report at honest urgency.