A colonoscopy is a medical procedure [a way that doctors check your body] that allows doctors to examine the inside of your colon [the long tube in your body where waste is stored before it is eliminated]. During a colonoscopy, a flexible tube with a camera on the end is inserted into your rectum [the opening at the end of your digestive system] to look for any abnormalities or signs of disease.
For example, if you have been experiencing symptoms like abdominal pain, rectal bleeding, or changes in bowel movements, your doctor may recommend a colonoscopy to investigate the cause of these symptoms.
Very Simple Definition:
A colonoscopy is a medical procedure where a doctor uses a special tube with a camera to look inside your bottom and check for any problems.
For example, if you have a tummy ache or you see blood when you go to the toilet, the doctor might do a colonoscopy to see what is wrong.