Capsule endoscopy (PillCam): what it shows and when it is used

What capsule endoscopy means

Capsule endoscopy is a test that lets a specialist look inside the small bowel without using a long flexible scope. You may also hear it called PillCam, which is a common name for this type of small bowel capsule endoscopy.

The capsule is a small, single-use device about the size of a large vitamin pill. It contains a tiny camera, light source, battery and transmitter. You swallow it with water, then it takes thousands of images as it travels naturally through your digestive tract.

The aim is not to feel or steer the capsule. It simply moves with the normal movement of your gut. The images are sent to a small recorder that you wear for the test period, then the specialist reviews the images afterwards.

Swallowing the capsule usually does not require sedation. You wear a recorder while it travels through your gut and follow the eating, drinking and activity instructions provided. If swallowing is difficult, tell the team before the test so they can assess the best approach.

The test is used for adults when the clinical question is about the small bowel. It is not a general health screen and it is not the same as bowel cancer screening with a colonoscopy. Its value comes from matching the right test to the right part of the gut.

At Colonoscopy Brisbane, capsule endoscopy is part of a broader gut health service led by Dr Goutham Sivasuthan, a Specialist Endoscopic and Minimally Invasive Surgeon based in Brisbane.

How PillCam differs from colonoscopy and gastroscopy

A colonoscopy, gastroscopy and capsule endoscopy all help doctors look inside the digestive tract, but they look at different areas and do different jobs.

A colonoscopy uses a flexible scope passed through the back passage to view the large bowel, also called the colon. During a colonoscopy, the doctor can often take biopsies and remove polyps if needed.

A gastroscopy uses a flexible scope passed through the mouth to view the oesophagus, stomach and the first part of the small bowel. It can also allow biopsies and some treatments during the same procedure.

Capsule endoscopy is different. It is a camera-only test that is mainly used to see the small bowel, the long middle section of the digestive tract. This area sits between the stomach and the large bowel. A standard gastroscopy reaches only the upper end of this area, and a standard colonoscopy reaches only the lower end.

This is why capsule endoscopy usually complements colonoscopy and gastroscopy rather than replacing them. It can show areas that are hard to reach with standard scopes, but it cannot take a biopsy, remove a polyp, stop bleeding or treat a narrowing. If the capsule shows something that needs treatment or tissue sampling, your doctor will talk with you about the next step.

A helpful way to think about it is that colonoscopy and gastroscopy are viewing-and-treatment procedures, while PillCam is a viewing-only test for a hard-to-reach area. That difference matters when choosing the safest and most useful pathway.

When capsule endoscopy is actually used

Capsule endoscopy is not a first test for every bowel symptom. It is usually considered when your doctor has a specific reason to look at the small bowel.

One common reason is unexplained iron-deficiency anaemia or bleeding after a colonoscopy and gastroscopy have not found a cause. In that situation, the small bowel may need closer review because standard scopes cannot see most of it.

Another reason is suspected small bowel disease, such as Crohn’s disease, when the symptoms, blood tests or earlier imaging suggest the small bowel could be involved. Capsule endoscopy may also be used to look for a source of bleeding that is thought to be coming from the small bowel.

Your doctor may also consider what has already been checked. For example, if symptoms point more strongly to the stomach, large bowel or reflux, another test may be more useful than capsule endoscopy. If the main concern is the small bowel, PillCam may provide information that standard scopes cannot.

The decision is made with your doctor, based on your symptoms, past tests, medical history and any safety concerns. It is not something you need to self-diagnose or arrange because you have heard the term online.

For local appointment information, see capsule endoscopy at Colonoscopy Brisbane. Your doctor will first consider whether examining the small bowel is likely to answer the clinical question.

What the day of the test can look like

Your preparation instructions will be given to you before the test. They may include food and drink limits before and after swallowing the capsule. Follow the instructions you are given, as they help the camera capture clearer images.

On the day, you usually swallow the capsule with water at the clinic or as instructed. You then wear a small recorder or sensor belt for a set period. This equipment receives the images sent by the capsule as it moves through the gut.

During the recording period, many people can go about light, normal activities. You may be asked to avoid certain activities, meals or drinks for part of the day. The team will explain the details that apply to you.

It can help to wear comfortable clothing that allows the recorder or belt to sit securely. You will also be told how to look after the equipment while you are wearing it and when to return it.

There are no needles or anaesthetic for the capsule itself. Most people do not need time off work, although this depends on your job, travel plans and the instructions you are given. If your work involves heavy physical activity or you are unsure, ask before the day of the test.

You do not need to retrieve the capsule. It is single-use and passes naturally in a bowel motion. The recorder is returned as instructed, and the images are then prepared for review by the specialist.

Suitability and safety

Tell your doctor about swallowing problems, previous bowel obstruction or surgery, and known or suspected bowel narrowing. A capsule can become stuck at a narrowing. Your doctor may recommend imaging or a dissolvable test capsule, called a patency capsule, before deciding whether the camera capsule is suitable.

If a capsule is retained, further treatment or a procedure to remove it may be needed. Contact the treating team promptly if you develop abdominal pain or vomiting after swallowing the capsule. Seek urgent medical care for severe pain, a swollen abdomen or inability to pass wind or stool.

Do not have an MRI scan while the capsule may still be inside you. Tell the MRI team that you have had capsule endoscopy and ask your treating doctor to confirm that it has passed before an MRI is arranged.

What happens after the capsule endoscopy

After the recording period, the equipment is returned and the images are downloaded for specialist review. A capsule endoscopy can produce thousands of pictures, so the result is not usually known while you are still wearing the recorder.

Sometimes the recording does not show the whole small bowel, or the images are not clear enough to answer the question. Your specialist will explain any limitation and whether another investigation is needed. A normal result does not rule out every possible cause of symptoms.

The specialist looks through the images for possible causes of your symptoms or blood test changes. This may include signs of bleeding, inflammation, ulcers, small bowel lesions or other changes. Not every finding explains symptoms, so interpretation matters.

Your results are discussed with you at a follow-up appointment or through the pathway arranged by your doctor. The next step depends on what the test shows and why it was requested.

If the capsule endoscopy is normal, your doctor may talk about whether any further testing is needed or whether monitoring is enough. If it shows an area that needs closer assessment, you may need another test, imaging, medication changes or referral for a specific treatment pathway.

Sometimes the most useful result is a clearer direction. A normal small bowel study may help your doctor focus on other causes. An abnormal result may help guide treatment or show where a future scope, scan or specialist review should focus.

Capsule endoscopy is most useful when it answers a clear clinical question. If you have been told you may need PillCam, a consultation with Dr Goutham Sivasuthan can help clarify why it has been suggested, how it compares with colonoscopy or gastroscopy, and what a reasonable next step looks like for you.

Frequently asked questions

Does capsule endoscopy replace a colonoscopy?

No. Capsule endoscopy does not replace colonoscopy for checking the large bowel, taking biopsies or removing polyps. It is mainly used to view the small bowel, which a standard colonoscopy and gastroscopy cannot fully reach.

Is swallowing the capsule difficult?

Most adults can swallow the capsule with water, as it is about the size of a large vitamin pill. If you have trouble swallowing tablets or have a known swallowing problem, tell your doctor before the test is booked.

Do I need to be sedated for capsule endoscopy?

Swallowing the capsule usually does not require sedation. If you have difficulty swallowing, your doctor will discuss whether another approach is needed and what that would involve.

What happens to the capsule afterwards?

The capsule normally passes in a bowel motion and does not need to be retrieved. Return the recording equipment as instructed. Follow your team’s advice about checking that the capsule has passed and contact them if you are uncertain.

Can capsule endoscopy find bowel cancer?

Capsule endoscopy can sometimes show abnormal areas in the small bowel, including changes that need further investigation. It is not a replacement for colonoscopy when the question is bowel cancer in the large bowel, and it cannot take biopsies. Your doctor will recommend the test that best matches your symptoms and risk factors.

How is capsule endoscopy different from a gastroscopy?

A gastroscopy uses a flexible scope to view the oesophagus, stomach and first part of the small bowel, and it can take biopsies. Capsule endoscopy uses a swallowable camera to capture images mainly through the small bowel, but it cannot biopsy or treat anything during the test.

Last medically reviewed by Dr Goutham Sivasuthan, FRACS — 24 September 2026. This article is general information and does not replace individual medical advice.