Medical Oncologist
CION Cancer Clinics
Colon cancer risk factors you cannot change, and what to do about them | CION Cancer Clinics
The colon cancer risk factors you cannot change are your age, your family history, an inherited gene fault, and your own past polyps or long-standing colitis. None of them means you will get cancer, and most people diagnosed have no single cause. What these factors do is decide when your screening should start and how often it is repeated. This page explains each one and the next step it points to. At CION Cancer Clinics in Hyderabad, our oncologists explain colon cancer in plain words and plan care around you and your family.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- Which colon cancer risk factors are outside your control?
- What are the risk factors you were born with or already carry?
- If a risk factor cannot be changed, what is the next step?
- Four things families say about fixed risk, and what is true
- What this page cannot tell you
- Common questions about risk factors you cannot change
The short answer
Which colon cancer risk factors are outside your control?
Your age, your family history, an inherited gene fault, a previous polyp or cancer, and long-standing inflammatory bowel disease are the main risk factors you cannot change. None of them causes cancer on its own. They shift the odds, and the sensible response to each is the same: tell your doctor and agree how closely you should be watched.
Risk is not the same as cause
Most people who develop colon cancer have no single identifiable cause. A risk factor is something that makes the disease a little more likely across a large group of people. It does not explain why one person was affected and a neighbour with the same history was not. Many people with every risk factor on this page never develop colon cancer, and many with none of them do.
Why it still helps to know
Fixed risk factors decide which screening pathway you belong to. A person with no family history is screened on the ordinary schedule. A person whose father had colon cancer at a young age is usually offered earlier and more frequent colonoscopy. The factor itself cannot be removed, but what it leads to often can be, because polyps found at screening are taken out before they become anything worse.
Nothing on this page is anyone's fault. These are facts about your body and your family, not choices you made.The fixed factors
What are the risk factors you were born with or already carry?
Each of these raises risk by a different amount. Your doctor weighs them together rather than one at a time.
Getting older
Age is the single biggest fixed risk factor. Most colon cancers are found in people past middle age, because polyps take many years to form and change. Colon cancer in younger adults is becoming more common in India, but it is still the exception.
What it changes
- When routine screening is offered
- How seriously a new bowel symptom is taken
A close relative with colon cancer or polyps
A parent, brother, sister or child who had colon cancer roughly doubles your own risk, and more if they were young or if more than one relative was affected. A relative with advanced polyps counts too. Cousins, uncles and grandparents matter less but are still worth mentioning.
Write the family history down before your appointment. Ask older relatives; many diagnoses were never discussed.An inherited gene fault
A small share of colon cancers run in families because of a single faulty gene passed from a parent. Lynch syndrome and familial adenomatous polyposis, a condition that produces hundreds of polyps, are the two best known. They are rare, but the risk they carry is high and screening in these families starts young.
Clues that point to it
- Colon cancer before fifty in a relative
- Several relatives on one side of the family
- Womb, ovarian or stomach cancer in the same family
Your own medical past
Previous polyps, a previous colon cancer, and many years of ulcerative colitis or Crohn's disease affecting the colon all raise risk. Radiation to the abdomen for an earlier cancer does too. Each of these puts you on a surveillance plan rather than the ordinary screening schedule.
Not sure whether this applies to you?
Ask an oncologistWhat you can still do
If a risk factor cannot be changed, what is the next step?
Tell a doctor, in detail
Bring the family history, your own polyp or colitis history, and the ages at diagnosis. A physician or oncologist uses exactly these details to place you on the right pathway. Vague answers lead to vague advice.
Agree a screening plan
Average-risk people are offered a stool test or colonoscopy from the mid-forties. Higher-risk people are usually offered colonoscopy earlier and more often. CION arranges colonoscopy through partner hospitals and keeps the interval under review.
Ask whether genetic counselling applies
If the pattern suggests Lynch syndrome or polyposis, a genetic counsellor can draw the family tree and advise on testing. The cancer genetics pages explain what a referral involves and who should be tested first.
Work on the factors you can change
Fixed risk and changeable risk add together. Staying active, limiting alcohol and not smoking do not erase a family history, but they are the part of the sum you control. See the risk factors you can change.
Know the symptoms that need a visit this week
Bleeding, a lasting change in bowel habit, unexplained tiredness or weight loss should be checked promptly in anyone, and sooner still in someone already known to be at higher risk.
Commonly believed
Four things families say about fixed risk, and what is true
"My father had colon cancer, so I will get it too."
A family history raises your risk; it does not decide your future. Most children of someone with colon cancer never develop it. What the history does is earn you earlier colonoscopy, which finds polyps while they are still harmless.
"Nobody in my family had it, so I am safe."
Most people diagnosed with colon cancer have no family history at all. A clean family tree means you belong on the ordinary screening schedule, not that screening can be skipped.
"I am too young for colon cancer."
It is less common in younger adults, but it is rising in India and it is often found late in this group because nobody suspected it. Age lowers the odds; it does not rule anything out when symptoms are present.
"The cancer came from the mother's side, so the men are not affected."
Inherited gene faults pass equally through fathers and mothers, to sons and daughters. A father can carry and pass on a Lynch fault without ever being unwell himself, which is one reason a family pattern is sometimes missed.
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Did you know
A person with a strong family history who has regular colonoscopy can end up at lower risk than an average person who is never screened, because polyps are removed before they can change. Fixed risk sets the starting point. Screening changes where you finish.
Being straight with you
What this page cannot tell you
It cannot tell you your own level of risk. That takes a conversation with a doctor who has your family history, your age and your medical past in front of them, and who can decide which screening pathway fits. A list of risk factors on a screen cannot weigh them against each other for you.
It cannot tell you whether your family has a gene fault
Only genetic counselling and, where appropriate, a test can do that. If colon cancer, womb cancer or very many polyps run through your family, especially at young ages, ask for a referral. Read whether colon cancer is hereditary first if you are unsure whether your family counts.
Who this does not apply to
If you already have a symptom, such as bleeding, a changed bowel habit or unexplained anaemia, a low haemoglobin on a blood test, risk factors are no longer the question. A symptom needs to be investigated whatever your age or family history, and a reassuring risk profile should never delay that.
If you are not sure whether your history counts as higher risk, call the helpline and describe it. Someone will tell you honestly whether it changes anything.Questions we are asked
Common questions about risk factors you cannot change
Does being a man or a woman change colon cancer risk?
Men are diagnosed slightly more often than women, but the difference is small and both are screened the same way. Women should not assume lower risk, and a bowel symptom in a woman deserves exactly the same attention as it would in a man.
My grandmother had colon cancer. Does that count?
A grandparent raises risk a little, much less than a parent or sibling would. Mention it, especially if she was young or if other relatives on that side were affected. On its own it rarely changes your screening plan.
At what age should someone with a family history start screening?
Usually earlier than the general population, and often by colonoscopy rather than a stool test. The exact starting age depends on how old your relative was at diagnosis and how many relatives were affected. Your doctor sets it from those details.
If I had polyps removed, am I now at higher risk?
You are more likely to form polyps again, which is why a follow-up colonoscopy is planned. Because those polyps are removed when found, the risk of an actual cancer is kept low. Keeping the follow-up appointment is what matters.
Does type 2 diabetes count as a fixed risk factor?
It sits between the two lists. Diabetes raises colon cancer risk modestly, and while you cannot undo the diagnosis, good control, weight and activity all influence the risk. Read the diabetes and colon cancer page for detail.
Can a genetic test tell me my risk?
Only for the small group of families with an inherited syndrome. For everyone else there is no single test that gives a personal risk number, and online tests that claim to are not reliable. A counsellor can tell you whether testing applies to you.
Is colon cancer more common in some Indian communities?
Rates differ across regions and are rising in cities, but the differences seem to track diet, weight and screening rather than community itself. Your own family history and medical past tell your doctor far more than your background does.
I have several fixed risk factors. Should I worry?
Worry is not the useful response; a plan is. Several fixed factors together mean a closer surveillance schedule, and sometimes a genetic referral. Bring the full list to a doctor, or call the CION helpline and describe it, and the pathway is set from there.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — Colorectal Cancer Risk Factors
- Cancer Research UK — Risks and causes of bowel cancer
- NHS — Causes of bowel cancer
- National Cancer Institute — Genetic Testing Fact Sheet
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Colon cancer risk factors you can changeThe other half of the picture: the part of your risk you controlFamily history of colon cancerWhat a parent's or sibling's diagnosis means for youAverage-risk vs high-risk screening pathwaysWhich screening route your risk factors put you onLynch syndrome and colon cancerThe most common inherited cause, explained plainly
Talk to us
Not sure whether your history puts you at higher risk?
Tell us your age, your family history and any past polyps or colitis, and a CION doctor will explain which screening pathway fits you. One helpline serves every CION centre.