Common procedures explained: Gastroscopy

What to expect and how to prepare.

A gastroscopy, also known as an upper gastrointestinal (GI) endoscopy is a procedure used to examine your oesophagus, stomach and the duodenum (the first part of your small intestine).

A gastroscopy is a common and safe procedure, it is generally quick and simple, and most people can go home just hours afterwards.


A person holding their stomach

Gastroscopy explained

Before a gastroscopy, a local anaesthetic spray may be applied to the back of your throat to numb it, and most people are given a sedative through a small tube that is inserted into a vein (intravenous cannula) to help them relax.

The procedure is usually performed by a gastroenterologist. During the procedure the gastroenterologist inserts a gastroscope, a small tube about the size of your pinky finger with a camera on the end, into your mouth. They will then gently feed the gastroscope down your oesophagus to your stomach and duodenum.

The procedure usually only takes 10-15 minutes.

What is gastroscopy used for

A gastroscopy is generally a diagnostic procedure. Most of the time, they are performed to investigate symptoms associated with the upper digestive system, like indigestion, discomfort, nausea or trouble swallowing.

The gastroscopy can show if there is inflammation, an ulcer, polyp or other growth in your upper gastrointestinal system.

Doctors can also treat some conditions during a gastroscopy. Common examples include treating bleeding stomach ulcers, widening the oesophagus, taking biopsies and removing polyps.

The risks

Gastroscopies are generally very safe. But like all medical procedures, there is always a risk of complications.

Some of the more common complications include bleeding from a biopsy site, or where a polyp was removed. This is usually minor and rarely requires any further treatment.

Serious problems are rare, but there is a risk of bowel perforation and damaging teeth.

Preparing for a gastroscopy

Your stomach needs to be empty for the doctor to see properly during the procedure. You will usually be asked not to eat or drink anything for at least five hours before the procedure. Your doctor will give specific instructions beforehand, depending on the time of day your procedure is.

  • Some things to discuss with your doctor beforehand include:
  • Whether or not the procedure will be performed with a sedative, and your preferences
  • Any medications you are on, and if you need to adjust them or stop them before the procedure
  • Any drug allergies
  • Any major health conditions that may require special attention, for example heart and lung conditions.

Recovering from a gastroscopy

If you have a gastroscopy without a sedative, you are likely to be able to go home shortly afterwards.

If you have a sedative, you will be monitored until most of the effects of it have worn off. You will need to arrange for someone to accompany you home afterwards, as you should not drive, travel alone on public transport, operate machinery, sign legal documents, or drink alcohol for 24 hours afterwards.

Your throat may be a little sore, and you may feel bloated.

You will be able to eat again shortly after the procedure. The best thing to start with is a cool drink. And you should be able to return to work the following day.

Need a little extra support?

Going to hospital?

If you’re an eligible member with hospital cover you can speak to our Health Concierge# to get support and guidance before and after your hospital stay. Call 1800 789 414 between 9am—5pm AEST (Mon-Fri). Just be sure to have your Medibank membership details ready.

Got a health question? 24/7 Medibank nurse phone service

Members with hospital cover can chat to experienced and qualified nurses over the phone to discuss any health questions or concerns and get professional advice on what to do next. Our nurses are available on 1800 644 325~ for round-the-clock health advice. 

Looking for something else?

Visit our Hospital Assist homepage for a range of tools and advice to help you at every stage of your hospital journey.

Help the way you want it

Contact us 

Call us on 134 190 to speak to a consultant. Alternatively, chat to us 24/7 online.

Self-service options

Login to MyMedibank or Download the MyMedibank App for self service options.

Find a specialist

Find a specialist or Member's choice hospital using our find a provider tool.


Things you need to know

# Health Concierge is available to all eligible Medibank members who hold hospital cover. Excludes Overseas Visitor Health Cover, Working Visa Health Cover and Overseas Student Health Cover (OSHC).

~ OSHC members should call the Student Health and Support Line on 1800 887 283.

While we hope you find this information helpful, please note that it is general in nature. It is not health advice, and is not tailored to meet your individual health needs. You should always consult a trusted health professional before making decisions about your health care. While we have prepared the information carefully, we can’t guarantee that it is accurate, complete or up-to-date. And while we may mention goods or services provided by others, we aren’t specifically endorsing them and can’t accept responsibility for them. For these reasons we are unable to accept responsibility for any loss that may be sustained from acting on this information (subject to applicable consumer guarantees).