Hiatal Hernia on CT: What Does It Mean and Does It Matter?

A hiatal hernia on CT means the scan showed part of the stomach pushing up through the opening in the diaphragm (the hiatus) into the chest. It is a very common finding, especially in people over 50, and a small hernia often causes no problems and needs no treatment. Its importance depends mainly on the type, the size and whether you have symptoms.

This guide is for adults who have seen the phrase on a CT report, often from a scan done for another reason. It explains the wording and helps you prepare questions. It cannot tell you whether your hernia needs treatment; that is a decision for your clinician.

Chest pain should never be put down to a hiatal hernia without assessment. Hernia pain can feel like heart pain, and chest pain can signal a serious problem. If you have chest pain, call your local emergency number.

Healthdirect explains that a paraoesophageal hernia can become trapped in the chest and twist. This is an emergency that needs immediate surgery. Sudden severe chest or upper abdominal pain, especially with vomiting or being unable to swallow, needs emergency care.

Get an urgent appointment with a doctor, or use your local urgent advice line, if reflux or indigestion comes with any of the following.

• Difficulty swallowing, or pain when swallowing.
• Blood in your vomit, or vomit that looks like coffee grounds.
• Frequent vomiting.
• Weight loss you cannot explain.
• Upper abdominal pain, or pain during or after eating.

Usually not on its own. The NHS says hiatus hernias are common in people over 50 and often cause no problems. Cleveland Clinic estimates that about 1 in 5 people in the US has one, and that the proportion rises with age.

Small hernias are often found by chance on a CT of the chest or abdomen. Many people never have symptoms from them. If you feel well and have no reflux symptoms, the usual approach is no treatment, though your clinician may suggest keeping an eye on any new symptoms.

The word 'small' on a report is a description, not a diagnosis of reflux disease. A report may also say 'moderate' or 'large', or give a measurement. Ask your clinician what the size means for you rather than comparing numbers yourself.

Sliding hernias are the most common type. Cleveland Clinic puts them at about 95% of cases. The junction where the food pipe (oesophagus) meets the stomach slides up through the hiatus, sometimes moving back down again.

In a paraoesophageal, or 'rolling', hernia, part of the stomach bulges up beside the oesophagus while the junction may stay in place. Some hernias are mixed. A rare type also involves another abdominal organ.

The type matters because paraoesophageal hernias are the ones more likely to become trapped or twisted. Healthdirect notes that surgery may be considered for large hernias or paraoesophageal hernias to prevent complications, even when symptoms are mild. If your report says 'paraoesophageal', 'rolling', 'mixed' or 'large', ask whether a specialist review is planned.

It can contribute to it. Cleveland Clinic explains that when the junction between the oesophagus and stomach moves above the diaphragm, the barrier that normally keeps acid down works less well. Symptoms can include heartburn, regurgitation, indigestion, burping, bloating and a sore throat or hoarse voice.

But the link is not automatic. Not everyone with a hiatal hernia has reflux, and not everyone with reflux has a hernia. MedlinePlus notes that a hiatal hernia alone rarely causes symptoms; discomfort usually comes from acid, air or bile moving upwards.

If you have reflux that continues despite treatment and an endoscopy was normal, see our guide on persistent reflux with a normal endoscopy rather than assuming the hernia is the whole explanation.

CT gives a detailed picture of anatomy at one moment. It can show that part of the stomach lies above the diaphragm and give a sense of size and type. Healthdirect lists CT among the tests that may be used, alongside gastroscopy, a barium swallow, manometry and pH testing.

CT does not measure acid reflux or how well the oesophagus moves food down. If symptoms need investigating, other tests may be used. Cleveland Clinic lists an oesophageal pH test, an X-ray swallow study (oesophagram), upper endoscopy and manometry. Because a sliding hernia can move up and down, its appearance may differ between tests.

Many people need no treatment. When reflux symptoms occur, the NHS and MedlinePlus describe self-help measures first. These include smaller meals, not eating within a few hours of bedtime, raising the head of the bed, stopping smoking and losing weight if needed. Pharmacy or prescribed medicines can reduce acid; do not stop a prescribed medicine without advice.

Surgery is not common. It is usually considered when symptoms stay severe despite other treatment, when complications occur, or when the hernia is large or paraoesophageal. Possible complications described by MedlinePlus include slow bleeding leading to iron deficiency anaemia, mainly with large hernias, and, very uncommonly, strangulation. Long-term reflux can also inflame or narrow the oesophagus.

Bring a copy of the CT report and, if you can, any earlier scan or endoscopy reports. Note any reflux, swallowing or chest symptoms, when they started and what helps.

• Is my hiatal hernia sliding, paraoesophageal or mixed, and how large is it?
• Was it already seen on an earlier scan, and has it changed?
• Could it explain any of my symptoms, or is it most likely incidental?
• Do I need any further tests, such as an endoscopy or swallow study?
• Is a specialist or surgical opinion recommended in my case?
• Which symptoms should make me seek help urgently?

On SameCase, patients and verified doctors share de-identified cases. Reading how others with a hiatal hernia on CT described their report wording, symptoms and follow-up can help you think of questions for your own appointment. Similar cases cannot diagnose you or predict what will happen to you; use them to prepare for the conversation with your clinician.