Colorectal cancer is one of the few common cancers that screening can prevent outright, not merely detect early — because the polyp that would have become a cancer is removed during the same procedure that finds it. The recommended starting age in the United States moved from 50 to 45 because the disease is appearing more often in younger adults, and that shift matters most for people who feel completely well.
What you'll read
Why the age moved to 45
Rates of colorectal cancer in people under 50 have been rising for three decades while falling in older groups, and younger patients are more often diagnosed at an advanced stage — largely because neither they nor their doctors expect the disease at that age. Lowering the screening threshold is the direct response to that pattern.
Symptoms that need attention at any age
- Blood in the stool or on the paper — never assume it is only haemorrhoids, even if you have them
- A lasting change in bowel habit: looser, narrower or more frequent stools for more than a few weeks
- A feeling that the bowel does not empty completely
- Persistent cramping or abdominal pain in the same place
- Unexplained weight loss
- Iron-deficiency anaemia found on a routine blood test, especially in a man or a post-menopausal woman
None of these symptoms proves cancer — most turn out to be something else entirely. What they do prove is that a colonoscopy is warranted now rather than at the next birthday, whatever your age.
Which test to choose
| Test | How often | Note |
|---|---|---|
| Colonoscopy | Every 10 years | Finds and removes polyps in one session |
| FIT stool test | Every year | Non-invasive; a positive result still needs colonoscopy |
| Stool DNA test | Every 3 years | More false positives than FIT |
| CT colonography | Every 5 years | No sedation, but polyps still need a colonoscopy to remove |
The best screening test is the one you will actually do. A yearly stool test done reliably prevents more cancers than a colonoscopy repeatedly postponed — but if a stool test is positive, the colonoscopy is no longer optional.
What a colonoscopy is actually like
The preparation is the part people dread, and honestly it is the harder half: a day of clear liquids and a laxative solution that empties the bowel completely. The procedure itself takes twenty to forty minutes under sedation, and most people remember nothing of it. Any polyps found are removed during the same examination and sent to pathology.
Who should start earlier
- A parent, sibling or child diagnosed with colorectal cancer or advanced polyps — usually start ten years before their age at diagnosis
- Lynch syndrome, familial adenomatous polyposis or another inherited syndrome
- Long-standing ulcerative colitis or Crohn's disease affecting the colon
- Previous radiotherapy to the abdomen or pelvis
- Any of the symptoms above, at any age at all
Frequently asked questions
I have haemorrhoids. Is bleeding still worth checking?
Yes, always. Haemorrhoids are common, which means many people have both haemorrhoids and something else. Attributing rectal bleeding to piles without an examination is one of the most frequent reasons a colorectal cancer is diagnosed late.
Does a polyp mean I had cancer?
No. Most polyps are benign, and removing them is precisely how screening prevents cancer. The pathology report will say which type it was, and that determines when your next colonoscopy is due — often three to five years rather than ten.
Can screening and colonoscopy be done abroad?
Yes, and it is often bundled into a two- or three-day check-up package at accredited hospitals in İstanbul, with the pathology report issued in English. If a polyp or tumour is found, the same team can move directly to staging and treatment planning.
Found something on a screening test?
Send the colonoscopy report and pathology. An oncologist will confirm the stage and tell you what the standard treatment plan should look like.