A colonoscopy is a procedural examination of the inside of the large intestine, which includes the anus, rectum, and colon. This procedure utilizes an endoscope, or a flexible tube with a camera on one end, inserted into the body to provide the doctor with pictures of the large intestine.
A colonoscopy may be performed for diagnostic, preventive, or therapeutic means. One such use for a colonoscopy is for cancer screening of colorectal cancer. Since this type of cancer often has no symptoms, a colonoscopy screening is crucial for detecting it in its early stages.
The American Cancer Society recommends that adults undergo regular screening for cancer with a colonoscopy by the age of 45. Those with a family history of colorectal cancer may receive recommendations from their doctor to receive screenings even earlier or more frequently.
A colonoscopy may also be performed for diagnostic reasons for those with symptoms that include:
- unexplained rectal discharge or bleeding
- unexplained persistent abdominal pain
- unexplained changes in bowel habits, such as constipation, diarrhea, or incontinence
- unexplained weight loss