A hiatus hernia, or hiatal hernia, is when part of the stomach squeezes into the chest through an opening in the diaphragm called the hiatus.
The diaphragm is a large, thin sheet of muscle located between the chest and the abdomen (tummy).
Hiatus hernia and heartburn
A hiatus hernia itself rarely has any noticeable symptoms. However, it can cause a problem called gastro-oesophageal reflux disease (GORD).
GORD is when stomach acid leaks into the oesophagus (the tube that carries food to the stomach). It can occur if a hiatus hernia prevents the valve at the bottom of the oesophagus from working properly.
Your oesophagus can become severely irritated because it is not protected against stomach acid. This may result in symptoms such as heartburn, chest pain, an unpleasant sour taste in your mouth, and problems swallowing (dysphagia).
You should see your GP if you have frequent and severe symptoms of GORD.
Who is affected?
Hiatus hernia can affect anyone, but it's more common in women and people who are over 50, overweight, pregnant or who smoke. It's estimated that a third of people over 50 have a hiatus hernia.
There's also a rare type of hiatus hernia that affects newborn babies.
Why it happens
It's not exactly clear what causes hiatus hernia, but it may be the result of the diaphragm becoming weak with age or pressure on the abdomen.
Hiatus hernia can occur in newborn babies if the stomach or diaphragm doesn't develop properly.
Types of hiatus hernia
There are two main types of hiatus hernia:
- sliding hiatus hernias – hernias that move up and down, in and out of the chest area (more than 80% of hiatus hernias are this type)
- para-oesophageal hiatus hernias – also called rolling hiatus hernias, this is where part of the stomach pushes up through the hole in the diaphragm next to the oesophagus (about 5-15% of hiatus hernias are this type)
This information mainly focuses on sliding hiatus hernias.
The type of hiatus hernia can usually be diagnosed using an X-ray or an endoscopy, where a long, tube-like instrument with a video camera and light source is used.
Read more about diagnosing a hiatus hernia.
Treating hiatus hernia
Treatment for sliding hiatus hernia usually focuses on relieving the symptoms of GORD, such as heartburn.
Lifestyle changes and medication are the preferred treatments. Surgery is usually only recommended as an alternative to long-term medication or if other treatments haven't worked.
Lifestyle advice may include:
- eating smaller, more frequent meals rather than three large meals a day
- avoiding lying down (including going to bed) for three hours after eating or drinking
- removing any foods or drinks that make your symptoms worse from your diet
If a hiatus hernia isn't causing any noticeable problems, it doesn't usually need to be treated.
Para-oesophageal hiatus hernias are repaired surgically if there is a risk of serious complications.
Read more about treating hiatus hernia.
It's rare for a hiatus hernia to cause complications, but long-term damage to the oesophagus caused by leaking stomach acid can lead to ulcers, scarring and changes to the cells of the oesophagus, which can increase your risk of oesophageal cancer.
Read more about the complications of hiatus hernia.