Medically reviewed by (Dr Nikita nair)
Persistent upper abdominal pain, heartburn or digestive discomfort can be worrying. While many mild digestive symptoms improve with lifestyle changes or medication, symptoms that persist, worsen or occur alongside warning signs may require further investigation.
One of the most useful investigations is an endoscopy , also known as a gastroscopy. This minimally invasive procedure allows a doctor to examine the lining of the:
- Oesophagus, or food pipe
- Stomach
- Duodenum, which is the first part of the small intestine
A gastroscopy does more than provide a visual examination. During the same procedure, the doctor may collect tissue samples, test for certain conditions, stop bleeding, remove selected growths or widen a narrowed area.
This guide explains when an upper endoscopy may be necessary, what it can detect, what alternatives are available and what patients can expect from the procedure.
When Does a Doctor Recommend an Endoscopy?
Many minor digestive issues, such as occasional indigestion from eating spicy food, can be managed with lifestyle changes or over-the-counter medications.
However, when symptoms become chronic, severe, or begin to interfere with your daily life, a closer medical evaluation becomes imperative.
What Symptoms May Require an Endoscopy?
Your specialist will typically recommend this procedure to investigate specific “red flags” or alarming symptoms that cannot be fully explained by a basic physical exam or blood tests.
An endoscopy is necessary if you are experiencing:
- Unexplained and Persistent Abdominal Pain: Chronic pain in your upper abdomen that does not subside needs direct visualisation.
- Severe or Chronic Heartburn: Persistent acid reflux (GERD) can severely damage the lining of your esophagus over time.
- Difficulty Swallowing (Dysphagia): If food feels stuck in your chest, an examination is required to check for strictures or blockages.
What are the Red Flags (Alarming Symptoms) for Upper Endoscopy?
Certain symptoms dictate that an endoscopy should not be delayed. These include:
- Gastrointestinal Bleeding: Vomiting blood (which may look like dark coffee grounds) or passing black, tarry stools requires urgent evaluation.
- Unexplained Weight Loss or Anemia: Dropping weight without trying, or a low red blood cell count, can be signs of internal bleeding or severe malabsorption.
- Chronic Nausea and Vomiting: Inability to keep food down for extended periods suggests potential blockages.
What Does Endoscopy Detect?
Once the procedure is underway, the high-definition camera on the endoscope provides your doctor with a clear, magnified view of your esophagus, stomach, and duodenum. Doctors then can look out for;
- Peptic Ulcers: Painful sores on the inner lining of the stomach or lower esophagus.
- Inflammation: Conditions such as esophagitis or gastritis.
- Complications from GERD: Including Barrett’s esophagus, which is a precancerous condition.
- Celiac Disease: By examining the small intestine lining, doctors can detect signs of an autoimmune reaction to gluten.
- Polyps and Tumors: It is a crucial diagnostic tool for detecting noncancerous growths and cancerous tumors early.
Diagnostic Alternatives
Which is Better, CT Scan or Endoscopy?
CT scan and an endoscopy provide different types of information. One is not universally better than the other.
An endoscopy is particularly useful for:
- Directly examining the inner lining of the oesophagus, stomach and duodenum
- Detecting small ulcers, inflammation and superficial lesions
- Taking biopsies
- Treating bleeding or narrowing during the procedure
A CT scan is particularly useful for:
- Examining organs and structures outside the digestive tract
- Assessing the liver, pancreas, kidneys and surrounding tissues
- Detecting masses, perforation, obstruction or complications beyond the inner lining
- Evaluating areas that cannot be reached by a standard gastroscope
In some cases, both tests are required because they answer different clinical questions.
What Can Be Done Instead of an Endoscopy?
Alternative diagnostic tools include a Barium Swallow (an X-ray test) or abdominal ultrasounds.
However, these are generally less accurate for detecting small mucosal ulcers or early-stage cancers and lack the therapeutic capabilities of an endoscope.
Safety, Risks, and Considerations
Is Having an Endoscopy Serious?
While it is a clinical procedure, an endoscopy is considered routine, minimally invasive, and safe when performed by an experienced gastroenterologist.
Is Endoscopy 100% Safe?
No medical procedure is 100% risk-free. However, the complication rate for an upper endoscopy is exceedingly low.
The risk of mortality (passing away) is incredibly rare—often estimated at less than 1 in 10,000 cases—and is typically associated with patients who have severe, pre-existing cardiopulmonary disease reacting to the sedation.
Which is More Risky, Endoscopy or Colonoscopy?
Both procedures are extremely safe. However, a colonoscopy generally carries a slightly higher (though still very rare) risk of bowel perforation.
This is primarily because the walls of the colon are thinner than the stomach, and the endoscope must navigate more curves and twists in the lower GI tract.
How Painful is an Endoscopy Procedure?
The procedure is generally painless. The gastrointestinal tract lacks standard pain receptors, and doctors use local anesthetic sprays to numb the throat, effectively neutralising the gag reflex.
When to Avoid Endoscopy? (Who Cannot Do an Endoscopy?)
An endoscopy may be contraindicated (avoided) in certain high-risk individuals.
Patients who have suffered a very recent heart attack, those with unstable cardiovascular disease, or individuals suspected of having an actively perforated bowel should typically avoid the procedure until their condition is medically stabilised.
What Can an Endoscopy Show Beyond Just Visuals?
The procedure is not just diagnostic; it is highly therapeutic. If your doctor spots an abnormality, they can pass tiny instruments through the endoscope to:
- Take a Tissue Biopsy: To check for H. pylori bacteria or test for cancer.
- Stop Active Bleeding: Using heat probes or medical clips directly on a bleeding vessel.
- Widen a Narrowed Esophagus: Using a specialised balloon to stretch strictures and relieve swallowing difficulties.
- Remove Polyps: Safely snipping away precancerous growths without traditional surgery.
Prioritise Your Digestive Health Through Timely Assessment
An upper endoscopy provides valuable information about the oesophagus, stomach and duodenum. It can identify inflammation, ulcers, narrowing, bleeding, precancerous changes and tumours while also allowing biopsies or treatment to be performed.
However, not every episode of abdominal discomfort or heartburn requires an endoscopy. The procedure should be considered according to the patient’s symptoms, warning signs, medical history and response to initial treatment.
Do not delay medical assessment if you experience vomiting of blood, black stools, progressive difficulty swallowing, unexplained weight loss, persistent vomiting or symptoms of significant anaemia.
Gastroscopy and Colonoscopy at ACC Evesuite Medical Centre
ACC Evesuite Medical Centre in Ara Damansara provides facilities for gastrointestinal assessment and selected endoscopic procedures.
Patients experiencing persistent digestive symptoms or warning signs may arrange a consultation with a qualified medical practitioner to determine whether gastroscopy, colonoscopy or another investigation is appropriate.
Book a consultation with ACC Evesuite Medical Centre to discuss your symptoms and receive an individualised assessment.
We invite you to take control of your digestive health today. Visit ACC Evesuite Medical Centre – Gastroscopy and Colonoscopy to learn more about our diagnostic screening services or to book a consultation with our medical specialists.
This article is intended for general educational purposes and does not replace consultation, diagnosis or treatment by a qualified healthcare professional.
References
[1] Mayo Clinic (2023). ‘Upper Endoscopy: Why it’s done and what you can expect’. Mayo Clinic Patient Care & Health Information. Available at: [https://www.mayoclinic.org/tests-procedures/endoscopy/about/pac-20395197] (Accessed: 1 July 2026).
[2] Cleveland Clinic (2022). ‘EGD Procedure (Upper Endoscopy)’. Cleveland Clinic Health Library. Available at: [https://my.clevelandclinic.org/health/procedures/22549-egd-procedure-upper-endoscopy] (Accessed: 1 July 2026).
[3] National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (2020). ‘Upper GI Endoscopy’. U.S. Department of Health and Human Services. Available at: [https://www.niddk.nih.gov/health-information/diagnostic-tests/upper-gi-endoscopy] (Accessed: 1 July 2026).
[4] American Society for Gastrointestinal Endoscopy (ASGE) Standards of Practice Committee (2012). ‘Appropriate use of GI endoscopy’. Gastrointestinal Endoscopy, 75(6), pp. 1127-1131. Available at: [https://doi.org/10.1016/j.gie.2012.01.011] (Accessed: 1 July 2026).
[5] American Society for Gastrointestinal Endoscopy (ASGE) Standards of Practice Committee (2015). ‘Complications of upper GI endoscopy’. Gastrointestinal Endoscopy, 82(4), pp. 604-611. Available at: [https://doi.org/10.1016/j.gie.2015.06.007] (Accessed: 1 July 2026).
