Endoscopy (Gastroscopy): What It Is and What to Expect, Step by Step

Booked for an endoscopy or "food-pipe camera test"? A calm, plain-language guide to why it is done, how to prepare, what happens on the day, and how you will feel afterwards.

Being told you need an endoscopy — a "camera test" to look inside your food pipe and stomach — can sound daunting. But it is one of the most common, routine tests a gastroenterologist does, it is usually quick, and it gives the doctor a clear, direct view that scans and blood tests cannot. This is a calm, step-by-step guide to why it is done, how to prepare, what actually happens, and how you will feel afterwards, so you can walk in knowing what to expect.

What an Endoscopy Is

An upper endoscopy (gastroscopy) uses a thin, flexible tube with a tiny camera and light on the end. The doctor gently passes it through your mouth to look at your food pipe (oesophagus), stomach, and the first part of the small intestine. Seeing the lining directly lets them spot inflammation, ulcers, or other changes — and, if needed, take a tiny tissue sample (biopsy) or treat something then and there. (Sources: NHS, NIH — rephrased.)

Why It Is Done

  • Ongoing acidity, heartburn, or reflux that needs a closer look
  • Difficulty or pain swallowing
  • Persistent upper tummy pain, nausea, or vomiting
  • Signs of bleeding (like black stools or vomiting blood) or unexplained anaemia
  • To take a biopsy or check on a known condition

How to Prepare

  1. Fasting: your stomach must be empty, so you will be told not to eat for roughly 6–8 hours before (small sips of water may be allowed up to a couple of hours before — follow your unit's exact instructions).
  2. Medicines: tell your doctor about everything you take. If you are on blood thinners or diabetes medicines, you may be told to adjust or pause them — only do this if instructed.
  3. Sedation choice: you may be offered throat-numbing spray, light sedation, or both — ask which applies to you.
  4. Arrange a ride: if you have sedation, you should not drive afterwards, so plan for someone to take you home.
Blood thinners matter If you take aspirin or other blood-thinning medicines, do not stop them on your own — and do not restart them after the test until your doctor says it is safe. Getting this wrong can cause bleeding or other problems. (Source: hospital endoscopy guidance.)

On the Day

  • Your throat is numbed with a spray, and you may be given a mild sedative to relax you (you stay awake but comfortable; some people do not remember much — that is normal)
  • You lie on your side; a small mouth-guard protects your teeth
  • The doctor gently passes the tube — it does not stop you breathing, and it is usually more strange than painful
  • The test itself is often over in about 10–15 minutes

Afterwards

  • Do not eat or drink until the throat numbness fully wears off (to avoid choking)
  • A mild sore throat, hoarseness, or bloating/burping for a day or so is normal
  • If you had sedation, expect to feel drowsy — rest, and do not drive or make big decisions that day
  • Restart medicines (especially blood thinners) only as your doctor directs
Call a doctor urgently after an endoscopy if you have
  • Severe or worsening tummy or chest pain
  • Vomiting blood, or passing black/tarry stools
  • A fever, or difficulty breathing or swallowing

These are uncommon but need prompt attention.

When to See a Doctor

If you have persistent acidity, swallowing trouble, upper tummy pain, or signs of bleeding, a gastroenterologist can advise whether an endoscopy is the right next step and explain the findings afterwards. The procedure itself is done in person, but the discussion around it — deciding if you need it, preparing, and reviewing results — suits an online consultation well. Understanding the test beforehand takes most of the worry out of it.

A note on sources General education based on trusted public health sources (NHS, NIH/NCBI, and major hospital patient guides). It does not replace the specific instructions of the team performing your procedure.

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