Medical Oncologist
CION Cancer Clinics
Colon, colorectal or bowel cancer: are they the same thing? | CION Cancer Clinics
Mostly, yes, with one important difference. Bowel cancer and colorectal cancer are umbrella words for cancer of the colon and the rectum together. Colon cancer means only the part above the rectum. The difference matters because rectal cancer is often treated with radiation before surgery, while colon cancer usually is not. This page explains what each word covers and which hub you need. 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
- Are colon, colorectal and bowel cancer the same disease?
- What changes when the cancer is in the rectum instead of the colon?
- Which word will you meet, and what does each one cover?
- What should you look for on your own report?
- Four mix-ups families tell us about, and what is true
- What this page cannot tell you
- Common questions about colon, colorectal and bowel cancer
The short answer
Are colon, colorectal and bowel cancer the same disease?
Bowel cancer and colorectal cancer mean the same thing: a cancer that starts anywhere in the large bowel, which is the colon and the rectum together. Colon cancer is the narrower word. It means only the part of the large bowel above the rectum. So every colon cancer is a colorectal cancer, but not every colorectal cancer is a colon cancer.
Why there are three names
Different countries prefer different words. British sources such as the NHS say bowel cancer. American sources say colorectal cancer. Reports from Indian hospitals and laboratories use both, and often print colorectal as a heading even when the tumour sits in the colon. None of these words is wrong. They simply describe groups of different sizes.
Why doctors group the colon and rectum together
The colon and the rectum share the same inner lining, and cancers in both usually start the same way, from a polyp that changes slowly over years. The same colonoscopy and the same stool tests look for both. Many of the medicines used when the disease has spread are also shared. That is why screening advice and statistics are usually given for colorectal cancer as one group, as the colon cancer overview explains.
In everyday speech, bowel cancer almost never means the small bowel. Cancer of the small intestine is a separate and much rarer disease.Side by side
What changes when the cancer is in the rectum instead of the colon?
Colon cancer
Rectal cancer
Starts in the long tube that runs around the belly
Starts in the last stretch of bowel, just above the back passage
Surgery usually comes first, with chemotherapy after if needed
Radiation, often with chemotherapy, may come before surgery
Staged mainly with a CT scan of the chest, abdomen and pelvis
Usually also needs a pelvic MRI to plan the operation
A permanent stoma is uncommon
A stoma is discussed more often, because the tumour sits near the muscle that controls the bowel
Covered on the colon cancer hub
Covered on the separate rectal cancer hub
The words you will see
Which word will you meet, and what does each one cover?
The same family can hear all four words in one week, from a relative, a website, a report and a doctor. Here is what each one means.
Bowel cancer
The everyday word, used by British charities and the NHS. It covers the colon and the rectum together. Families often use it because it is easier to say than either medical term.
Usually seen in
- Websites and leaflets from the UK
- Conversations at home and with relatives
Colorectal cancer
The medical umbrella term, covering exactly the same ground as bowel cancer. You will see it on biomarker reports for MSI, RAS and BRAF and in treatment guidelines, because those tests and medicines apply to both the colon and the rectum.
A report headed colorectal does not tell you which part of the bowel the tumour is in.Colon cancer
Cancer in the colon only, from the caecum on the right side, meaning the pouch where the small bowel joins, round to the sigmoid colon on the left. The colonoscopy and biopsy reports usually name the exact segment, and where it sits can shape the symptoms and the operation.
Rectal cancer
Cancer in the rectum, the last part of the large bowel before the anus. It is counted with colon cancer in statistics but planned differently, so it has its own rectal cancer hub. If your report says rectum or rectal, start there.
Not sure whether this applies to you?
Ask an oncologistBefore you read further
What should you look for on your own report?
- The segment named: caecum, ascending, transverse, descending or sigmoid colon
- Any mention of the rectum, rectal or rectosigmoid
- Any mention of the anus or the anal canal
- The word adenocarcinoma, the usual type of bowel cancer
- Whether a pelvic MRI has been asked for
- Which hospital or laboratory wrote the report, for a second look
Commonly believed
Four mix-ups families tell us about, and what is true
"Bowel cancer and colon cancer must be different diseases, because the names are different."
Bowel cancer is the bigger group, and colon cancer sits inside it. If a relative abroad says bowel cancer and your doctor here says colon cancer, they may well be describing the same illness in two different ways.
"Colorectal cancer means the cancer is in both the colon and the rectum."
It is the name of the group, not a description of one tumour. In almost every case the cancer started in one place, either the colon or the rectum. The word is used because the tests and many of the medicines apply to both.
"The label does not matter, because the treatment is the same."
The label changes the first step. Rectal cancer often starts with radiation before surgery, while colon cancer usually starts with the operation. A plan built for the wrong part of the bowel is the wrong plan, which is why the location is confirmed before anything begins.
"Bowel cancer is just piles that got worse."
Piles are swollen blood vessels near the back passage, and they do not turn into cancer. Both can bleed, though, and many people in their thirties and forties put bleeding down to piles for months. Bleeding that keeps coming back deserves an examination, whatever you think the cause is.
Being straight with you
What this page cannot tell you
It cannot tell you which part of the bowel your cancer is in. That comes from the colonoscopy report, the biopsy and the scans, read together. When a tumour sits close to where the colon becomes the rectum, even specialists may need an MRI and a tumour board discussion before deciding which plan fits. The colon versus rectal cancer page explains why that line matters so much.
Who this page does not apply to
If your report names the anus or the anal canal, you are dealing with anal cancer. It starts in different cells and is usually treated with chemotherapy and radiation together, so read the anal cancer hub instead. Cancers of the small intestine and the appendix also behave differently and have pages of their own.
It cannot read your report for you
Reports are written for the doctor who ordered them, and the heading at the top is not always the most precise word on the page. If you are unsure, bring the colonoscopy, biopsy and scan reports to an oncologist. CION's tumour board reviews them together and confirms the location before a plan is made.
If you cannot tell which hub you need, call the helpline with the report in front of you. Someone will read the key lines with you.Questions we are asked
Common questions about colon, colorectal and bowel cancer
Is bowel cancer the same as colon cancer?
Partly. Bowel cancer covers both the colon and the rectum, so it is a wider word. Colon cancer is the part of that group that starts above the rectum. If someone says bowel cancer, ask which part of the bowel they mean before reading anything else.
Why does my report say colorectal when my doctor said colon?
Laboratories and guidelines often use colorectal as a heading because the same tests apply to both parts of the bowel. Your doctor has used the narrower word because the colonoscopy or scans place the tumour in the colon. Both can be correct at once.
Does bowel cancer include the small intestine?
Not in normal use. When doctors and charities say bowel cancer, they mean the large bowel. Cancer of the small intestine is rare, behaves differently and is treated on its own terms. If your report names the small bowel, ask your doctor which guidance applies to you.
Is rectal cancer more serious than colon cancer?
Neither word on its own tells you how serious a cancer is. The stage does that. Rectal cancer is planned differently because it sits in the narrow pelvis, close to the bladder, the sexual organs and the muscle that controls the bowel, not because it is always worse.
What is rectosigmoid cancer?
It is a cancer at the junction where the sigmoid colon meets the rectum. Because it sits on the border, doctors use an MRI and the tumour's exact position to decide whether it should be planned like a colon cancer or like a rectal cancer. The tumour board makes that call.
Are screening tests the same for colon and rectal cancer?
Yes. A colonoscopy and the common stool tests look at the whole large bowel. A positive stool test does not diagnose cancer; it means a colonoscopy is needed. A negative stool test does not rule out cancer if you have symptoms, so symptoms still need a doctor.
Is anal cancer a type of bowel cancer?
It is usually counted separately. Anal cancer starts in the skin-like cells of the anal canal rather than the gland cells of the bowel lining, and it is most often treated with chemotherapy and radiation together. It has its own hub on this site.
Where do I start if I am not sure which hub I need?
Look at the colonoscopy and biopsy reports for the words colon, rectum, rectosigmoid or anus. If the reports are unclear, or say different things, call the CION helpline. An oncologist can review them and tell you which part of the bowel is involved.
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
- NHS — Bowel cancer
- American Cancer Society — What Is Colorectal Cancer?
- Cancer Research UK — Bowel (colorectal) cancer
- National Cancer Institute — Rectal Cancer Treatment
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.
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Related pages
Talk to us
Not sure which part of the bowel your report names?
Send us the colonoscopy and biopsy reports, and an oncologist will tell you whether they describe a colon, rectal or anal cancer and what that means for the next step. One helpline serves every CION centre.