You've Just Been Diagnosed With Colorectal Cancer and There Is a Clear Path Forward

Your body is built from tiny building blocks called cells. You have trillions of them, and they do different jobs depending on where they are.

Your large intestine is a tube about five feet long. Food passes through your small intestine first, where most goodness is absorbed, then into the large intestine, where water is taken out and waste is formed. The first and longest part is the colon. The last few inches, just before the opening, is the rectum.

Colorectal cancer is a single name covering cancer in either of those places. You may also hear bowel cancer, colon cancer or rectal cancer, which all describe the same family.

Almost all of it starts as a polyp, which is a small growth on the inside lining of the tube. Most polyps never become anything. A few change slowly over years and become cancer. That slow timeline is exactly why screening works so well, because a polyp found early can simply be removed.

The wall of the bowel has layers, like an onion. How deep the cancer has grown through those layers matters more than how wide it looks across. A small tumour that has grown through the wall is treated more seriously than a wider one that has stayed shallow.

Here is the thing that surprises most people. Colon cancer and rectal cancer are treated differently. They get grouped under one name and they are not the same job. Rectal cancer usually involves radiation. Colon cancer usually does not.

You did not cause this by what you ate. Diet plays some part across whole populations, but for any one person there is no meal, no takeaway and no year of eating badly that caused this. Plenty of people with careful diets get colorectal cancer and plenty of people with terrible ones never do.

You are not too young for this. Colorectal cancer in people under fifty has been rising for years. If you have been told you are too young, or told yourself that, you were not. It also means that if you have children or siblings, this is worth them knowing about.

You cannot catch it and you cannot give it to anyone. It is not caused by a germ and does not pass between people, including through anything to do with toilets, food you have prepared, or physical closeness.

One more thing, because it stops people asking for help. There is nothing embarrassing about this. Your bowel is an organ like any other. The people treating you talk about it all day, every day, and there is no detail you could mention that would surprise them.

Colon or rectal. This is the first and biggest split. Rectal cancer sits in a tight space surrounded by other structures, which makes the surgery harder and usually means radiation is part of the plan. Colon cancer usually does not involve radiation. Ask which one you have and where in the bowel it sits.

Which side. Even within the colon, the side matters. Tumours on the right side and on the left side tend to behave differently and respond differently to certain medicines. Your doctor already knows which yours is.

MSI and mismatch repair. These two tests, often written MSI and MMR, check whether your tumour has a faulty internal repair system. If your report says MSI-high or mismatch repair deficient, that is genuinely important news. Immunotherapy, which works by helping your own immune system recognize the cancer, works exceptionally well in this group. In some rectal cases it has allowed people to avoid surgery entirely.

This testing is recommended for everyone with colorectal cancer and it still gets missed. Ask whether it has been done.

KRAS, NRAS, BRAF and HER2. Genetic faults inside the tumour. These are usually tested when the cancer has moved beyond the bowel, and they decide which medicines will help.

You may not have these results yet. They usually take one to two weeks after your biopsy or surgery.

Most people find out from a gastroenterologist, which is a doctor who specializes in the digestive system and who probably did your colonoscopy. Some find out from a family doctor calling with results, and some in an emergency department.

Those people did exactly the right thing by finding it. They are not who looks after you from here.

Colorectal cancer usually involves more than one main doctor.

• A colorectal surgeon does the operation. This is the central person for most people, particularly with rectal cancer.
• A medical oncologist handles everything that comes as medicine. Chemotherapy, targeted medicines and immunotherapy. An oncologist is simply a cancer doctor.
• A radiation oncologist joins for rectal cancer.

Here is the part that matters. All surgeons who operate on bowels hold surgical qualifications, and from the outside they look the same. Some do a handful of these operations a year alongside other surgery. Others do almost nothing else.

With rectal cancer in particular, that difference is one of the most clearly documented in all of cancer surgery.

If you already have an appointment with someone, that is good. Keep it. Nothing here means cancelling anything.

If you feel very unwell right now, before you have seen anyone, or if you cannot pass anything at all and your stomach is swelling and painful, do not wait for an appointment. Go to your nearest emergency department and tell them at the desk that you have just been diagnosed with bowel cancer.

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Reason 1. A Specialist Orders the MSI Test.

Every guideline says that everyone with colorectal cancer should have MSI and mismatch repair testing. It still gets skipped.

Here is why it matters so much. If you are in that group, immunotherapy works remarkably well for you, in a way it does not for most people with this cancer. In certain rectal cases, immunotherapy alone has allowed people to avoid surgery completely.

A single test result can therefore move someone onto a completely different and far gentler path.

A colorectal specialist orders it as a matter of routine because they have seen it change lives. A doctor who treats many kinds of cancer may order it later, or not at all, and by then treatment has already been chosen.

That test result also tells you something about your family. Some MSI-high cancers are linked to an inherited condition, and finding it means your children and siblings can be screened.

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Reason 2. With Rectal Cancer, Surgical Technique Decides a Great Deal.

Rectal surgery is one of the clearest examples in medicine of the operation itself making a difference.

The rectum sits inside an envelope of fatty tissue containing lymph nodes, which are small glands that filter fluid. The operation involves removing the tumour together with that whole envelope, intact, without cutting into it. It is called total mesorectal excision.

How completely that is done is measured afterwards by the pathologist and recorded. It varies between surgeons, and it correlates with how often they do the operation.

Around the rectum sit the nerves controlling bladder function and sexual function. Preserving them is technically demanding and comes down to experience.

This is why so many health systems now direct rectal cancer surgery to designated centres. It is fair, and normal, to ask a surgeon how many rectal operations they perform each year.

Reason 3. Whether You Need a Permanent Bag Is Not Always Final.

The fear of a permanent bag dominates the first week for most people, and it is often based on a first conversation rather than a final answer.

Here is what people are not told. Whether the bowel can be rejoined depends on how close the tumour sits to the end of the rectum, and on the technique available to the surgeon. High volume centres are able to rejoin bowels in situations where other centres would not attempt it.

Treatment given before surgery can also shrink a tumour enough to change the answer.

So if you have been told a permanent bag is necessary, that is one of the most worthwhile things to get a second opinion on. Not because your surgeon is wrong, but because this specific question genuinely varies between centres.

And if you do need one, temporary or permanent, ask to meet a stoma nurse before your operation. People who meet one beforehand cope far better than people who meet one afterwards.

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Reason 4. Four Things Specialists Do That Others May Not.

They give all the treatment before surgery for rectal cancer. Giving chemotherapy and radiation before the operation rather than splitting it around the operation has become standard at leading centres and improves results.

They count the lymph nodes properly. At least twelve nodes should be examined after colon surgery. Fewer than that means the assessment was incomplete, and it changes whether chemotherapy is recommended.

They know when the liver is still operable. Colorectal cancer that has reached the liver can sometimes still be treated with surgery aimed at cure. That is not true of every cancer, and it gets missed by people who do not know to look.

They are willing to do less. Shorter chemotherapy, avoiding radiation, or watching after immunotherapy rather than operating. Each of those is supported by evidence and each takes confidence.

Reason 5. How We Pick the Doctors on This Site.

Every colorectal doctor on Cancerify is checked against a strict, published set of standards before we add them. We look at published research, work on clinical trials, professional recognition, leadership roles and awards.

Most of all, we look at whether that record is about colorectal cancer specifically rather than spread thinly across many cancers. Those are not the same thing.

Doctors can never pay to appear here, and neither can hospitals. We are not connected to any hospital or practice, and no money changes hands.

We do this so you do not have to spend the hardest week of your life trying to work out who is who.

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Almost everyone newly diagnosed should get a second opinion. Not sometimes, and not only if something feels wrong. It simply means having a different doctor look at your case and tell you what they think.

It is not rude and nobody will be offended. Doctors arrange second opinions for their own family members.

Here is the part nobody tells you. Who gives the second opinion matters more than the fact of getting one. Two doctors who each treat a few of these a year can easily miss the same thing, because they are working from the same general knowledge. That is the first opinion repeated.

With colorectal cancer there are three specific things a second opinion is worth getting.

• Whether a permanent bag is really necessary. This answer varies between centres more than almost anything else.
• Whether MSI testing has been done, and if not, getting it added.
• The surgical plan for rectal cancer, including whether all treatment should come before the operation.

When you arrange it, ask your current team to send on these things.

• Your colonoscopy report and photographs
• Your pathology report
• Your MSI and mismatch repair results if you have them
• Your CT scan, and for rectal cancer your pelvic MRI, on a disc
• Your treatment plan in writing

A week or two spent on this does not compromise anything.

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• Bring someone with you. Not just for support, though that helps, but for memory.
• Bring your results, or check they were sent ahead. Colonoscopy report, pathology, and scans on a disc.
• Write your questions down and put the most important one first.
• Ask if you can record it. Most doctors say yes.
• Ask for the plan in writing, including whether this is colon or rectal cancer and what stage you are.

• A colorectal surgeon does the operation and removes the nearby lymph nodes.
• A medical oncologist handles chemotherapy, targeted medicines and immunotherapy.
• A radiation oncologist joins for rectal cancer, and occasionally for colon cancer.
• A gastroenterologist did your colonoscopy and may stay involved in follow up.
• A pathologist examines your tissue and writes the report everything else depends on.
• A stoma nurse helps if you need a bag, temporarily or permanently. Meeting them before surgery makes an enormous difference.
• A colorectal nurse specialist is often the person you speak to most.

• Adenocarcinoma. The cell type. Almost all colorectal cancer is this, meaning it began in the gland cells of the bowel lining.
• Grade. How different the cells look from normal cells under a microscope.
• Depth of invasion. How far through the layers of the bowel wall it has grown. This matters more than width.
• MSI and mismatch repair. Whether the tumour has a faulty repair system. MSI-high or mismatch repair deficient means immunotherapy is likely to work well.
• KRAS, NRAS, BRAF, HER2. Genetic faults that decide which targeted medicines can help.
• Lymph nodes. How many were examined and how many contained cancer cells. Twelve or more examined is the standard for a thorough assessment.
• Margins. Whether healthy tissue surrounds the removed area on every side.
• CEA. A blood marker used to follow your progress over time rather than to diagnose.

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• Week one. Your biopsy results come back. You are referred to a colorectal surgeon. A CT scan of your chest, stomach area and pelvis is booked.
• Week one to two. If this is rectal cancer, an MRI of your pelvis. That scan shows the relationship between the tumour and everything around it, and it shapes the entire surgical plan.
• Week two to three. MSI and molecular results come back. Your case is discussed at a tumour board.
• Week three to five. Either surgery, or the start of treatment before surgery if that is the plan. For rectal cancer, treatment before surgery is common and runs over several weeks.
• After surgery. Full pathology comes back about a week later, and that is when your stage is confirmed and any further treatment is decided.

The waiting between appointments is the hardest part for most people. It is normal, and it is not a delay.

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Staging describes how deeply the tumour has grown into the bowel wall, whether nearby lymph nodes are involved, and whether cells have travelled to other organs.

The bowel wall detail surprises people. Depth matters more than width. A small tumour that has grown through the wall is staged higher than a larger one that has stayed shallow.

For rectal cancer the pelvic MRI does most of this work. For colon cancer the final answer often comes after surgery, when the tissue and nodes are examined.

What stage changes is the shape of the plan. Earlier stages usually mean surgery alone. Middle stages usually mean surgery plus chemotherapy, and for rectal cancer radiation as well. Later stages mean medicine leads.

One thing worth knowing. Colorectal cancer that has reached the liver or lungs can sometimes still be treated with surgery aimed at cure. That is not true of every cancer, and it is worth asking about directly.

Call your team straight away, at any hour, if you have any of these.

• A temperature of 100.4°F (38°C) or higher. Chemotherapy lowers the white cells that fight infection. Do not wait until morning, and do not take paracetamol or acetaminophen first, because that hides it. Every cancer centre treats fever during chemotherapy as an emergency.
• Shaking chills, even with a normal temperature reading.
• Severe stomach pain with a swollen belly, vomiting, and no wind or bowel movement passing. This can mean a blockage and needs seeing the same day.
• Heavy bleeding from your back passage.
• If you have a stoma, no output for several hours together with pain or swelling, or output that has become very watery and heavy.
• Redness, heat, swelling or fluid leaking from your surgical wound.
• Sudden breathlessness or chest pain, or swelling and pain in one calf.
• Being unable to keep fluids down for more than a few hours.

Your team should give you a number to call at any time. If nobody has given you one, ask at your next appointment. If you cannot find it, go to your emergency department and tell them at the desk that you have bowel cancer and are having treatment.

Nobody will think you are overreacting.

There is no food that cures colorectal cancer and no diet that replaces treatment.

Sugar does not feed cancer the way the internet says. Every cell uses sugar, including healthy ones, so cutting it out does not starve anything except you.

Your bowel will behave differently after surgery, and that settles. Going more often, more urgently, or less predictably is normal in the months after an operation, particularly rectal surgery. It usually improves a great deal over the first year. Knowing that in advance stops it feeling permanent.

If you have a stoma, eating takes some learning. Some foods block more easily, some cause more wind or odour, and it is different for everyone. This is exactly what stoma nurses are for, and they are very good at it.

Ask for a dietitian. Most cancer centres have one and most people are never offered one. With this cancer it is more useful than with almost any other.

Tell your team every supplement and herbal remedy you take. Some interfere with chemotherapy. Bring the actual bottles.

The embarrassment nobody mentions

This cancer involves a part of the body people do not discuss, and that changes how people talk about it. Some go quiet. Some make jokes. Some avoid the subject entirely and then feel awkward.

You are allowed to name it. Saying "I know it is an awkward one, you can just ask" usually clears the air in one sentence.

It also affects whether people ask for help. If you have a bag, or if your bowel is unpredictable, those are practical things with practical solutions, and the people who can solve them can only do so if you tell them.

Nobody treating you finds any of it embarrassing. They do this every day.

Telling family and friends

Decide who needs to know now and who can wait. You do not have to tell everyone at once, and you do not have to tell everyone at all.

There is one exception worth thinking about. If your cancer turns out to be linked to an inherited condition, your children, brothers and sisters may benefit from screening earlier than they otherwise would. That is a conversation worth having when you know your results.

If you work, you do not have to tell your employer your diagnosis, only what you need practically. If you have a stoma, reasonable adjustments like easier toilet access are normal requests.

If there are children in your life, telling them something true in simple words works better than saying nothing.

Why talking about it helps

A lot of people try to carry this quietly. That is understandable, and it tends to make things harder rather than easier.

Feeling frightened, angry, numb, or nothing at all is normal. So is being fine one hour and not fine the next. None of that means you are coping badly.

Talking does not fix the cancer, and it is not meant to. What it does is stop the same thoughts going round on their own at three in the morning.

Talking to someone professional

Most cancer centres have a counsellor or psychologist who works only with people who have cancer, and in most places this is free. Very few people are told about it, so you usually have to ask.

You do not need to be in crisis to see one.

Ask your colorectal nurse specialist, who will usually know who to contact.

If you find yourself feeling very low, hopeless, or not wanting to go on, tell your team. Say it plainly. They will take it seriously and they will not be shocked.

Support groups, and why they are different

Friends and family love you, and they cannot know what this is like.

A support group is different because everyone in the room has been where you are. Practical things get shared that no leaflet contains. What worked for bowel urgency. What clothes work with a bag. What to say when someone asks a question you would rather not answer.

• There are groups specifically for people with a stoma, and they are among the most practically useful groups in all of cancer care.
• There are groups for younger patients. Colorectal cancer under fifty brings its own questions about work, young children and fertility.
• Ask your hospital first. A group attached to a treatment centre tends to be better informed than a general online forum.
• Online groups can be excellent, and they can also be frightening. People post when things are difficult, so what you read is not a fair picture. If a group leaves you feeling worse each time, leave it.
• Groups for family and carers exist too.

You do not have to do any of this in the first week.