What Is Endoscopy?
Endoscopy is a medical test that lets doctors see inside your body using a special instrument called an endoscope. An endoscope is a thin, flexible tube with a light and camera on the end. It helps doctors look at the lining of organs such as the oesophagus (food pipe), stomach, intestines, or colon without making large cuts. The camera sends clear pictures to a screen so the doctor can find the cause of symptoms like pain, bleeding, indigestion, or swallowing problems.
Endoscopy is a common and safe procedure. It is often done to find problems early, diagnose diseases, or sometimes treat issues such as removing abnormal growths (polyps) or taking tissue samples (biopsies) for testing.
Purpose & Benefits of Endoscopy
● Helps find the cause of symptoms like abdominal pain, nausea, or bleeding
● Detects inflammation, ulcers, infections, or tumours.
● Allows biopsy (small tissue sample) for lab testing
● Can remove small growths or polyps during the same procedure
● Provides early diagnosis of digestive problems
● Avoids the need for major surgery
● Helps plan the right treatment
Who May Need Endoscopy?
Your doctor may recommend endoscopy if you have:
● Persistent stomach pain or heartburn
● Difficulty swallowing (dysphagia)
● Unexplained weight loss
● Vomiting or nausea that does not improve
● Blood in stool or vomit
● Chronic acid reflux
● Family history of digestive cancers
● Monitoring of conditions like Barrett’s esophagus
Endoscopy helps doctors evaluate the digestive tract safely and accurately.
Types of Endoscopy
1. Upper Endoscopy (Gastroscopy)
Used to see the oesophagus, stomach, and upper small intestine. Inserted through the mouth.
2. Colonoscopy
Examines the large intestine (colon). Inserted through the rectum.
3. Sigmoidoscopy
Similar to colonoscopy but views only the lower part of the colon (sigmoid colon).
4. Capsule Endoscopy
A patient swallows a tiny camera in a capsule that takes pictures as it moves through the digestive tract.
5. ERCP (Endoscopic Retrograde Cholangiopancreatography)
Used to view the bile ducts and pancreas and sometimes treat blockages.
The type of endoscopy depends on your symptoms and the area the doctor needs to examine.
Endoscopy Procedure: Step-by-Step
1. Your doctor will review your symptoms and medical history.
2. You may be asked not to eat or drink (fast) for several hours before the test.
3. Blood tests may be done if needed.
4. For upper endoscopy: avoid food and liquids for 6–8 hours.
5. For a colonoscopy, your doctor may ask for a special diet and bowel cleaning solution a day before the test.
6. You will be welcomed, checked in, and asked about your health status.
7. You may change into a hospital gown.
8. You will receive sedation or light anaesthesia so you remain relaxed and comfortable during the procedure.
9. Local numbing spray or medications are given for throat comfort.
10. The endoscope is gently inserted:
- Through the mouth for upper endoscopy.
- Through the rectum for colonoscopy/sigmoidoscopy.
- The camera sends live images to a screen for the doctor to see.
11. The doctor carefully inspects the lining of the organ.
12. Small tools may be passed through the scope to take a biopsy or remove a polyp if needed.
13. The endoscope is slowly removed.
14. You are moved to a recovery area to wake up from sedation.
Most endoscopy procedures take about 15–45 minutes, depending on the type and findings.
Recovery & Aftercare
● You will rest in a recovery area until sedation wears off.
● You may feel mild bloating or gas; this is normal.
● For upper endoscopy, your throat may feel slightly sore for a short time.
● Avoid heavy meals and strenuous activity for a few hours as advised.
● A friend or family member should accompany you because sedation might make you feel drowsy.
● Your doctor will give clear instructions about eating, medications, and follow-ups.
Usually, you can go home the same day once your doctor confirms it is safe.
Risks & Possible Complications
Endoscopy is generally safe, but as with any medical test, some risks include:
● Mild sore throat or bloating
● Mild bleeding at biopsy sites (usually stops on its own)
● Nausea or dizziness after sedation
● Rarely, more serious issues like perforation (tear) of the organ wall
● Rare reaction to sedative medicines
Your doctor and care team monitor you closely to reduce risks and respond quickly if needed.
Endoscopy vs Other Diagnostic Tests
Endoscopy
● Gives direct visual view of the internal lining
● Allows biopsy and minor treatment during the test
● Useful for many digestive conditions
Imaging Tests (like X-ray or CT scan)
● Provide pictures of structures but cannot take tissue samples
● May be used with endoscopy for a full evaluation
Ultrasound
● Good for imaging soft tissues outside the digestive lining
● It does not show real-time tissue lining like endoscopy
Endoscopy is often used when doctors want a detailed internal view and may need to do minor treatments at the same time.
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