A General Look at Symptoms and Stages

Let’s be real. Bowel cancer doesn’t always come with a flashing neon warning sign. I was diagnosed young, with barely any obvious symptoms. An itchy bum and slightly more regular toilet habits were the only clues. It wasn’t dramatic. It wasn’t textbook. And yet, here we are.

If you’re dealing with bowel cancer, supporting someone who is, or just trying to wrap your head around it all, understanding the symptoms and stages can give you back a little control in a situation that often feels anything but.

Got your own weird symptom story? Trust your gut. Literally.

What Is Bowel Cancer?

Bowel cancer (also called colorectal cancer) happens when cells in the lining of your bowel start growing out of control and form a tumour. It can start in the colon or rectum. While it’s more common in older people, it’s showing up in younger Australians more and more. Early-onset bowel cancer in your 20s, 30s or 40s isn’t rare anymore.

The good news? When caught early, it’s one of the most treatable cancers. But that only happens if we know what to look for and push for answers when something doesn’t feel right.

Common Symptoms of Bowel Cancer

The symptoms of bowel cancer are frustratingly vague. They often mimic IBS, haemorrhoids, or general gut weirdness, especially in younger people who are “too young for cancer” (spoiler: you’re not).

Things to watch out for:

• Changes in bowel habits – constipation, diarrhoea, or the feeling your bowel doesn’t fully empty
• Blood in your poo – bright red, dark, or even bleeding from your bum
• Abdominal discomfort – cramps, bloating, gas or pain that won’t bugger off
• Unexplained weight loss
• Fatigue or low iron levels (hello, iron-deficiency anaemia)
• A lump in the abdomen or rectum
• Feeling like you need to poo but nothing comes out

If any of these stick around for more than a few weeks, don’t ignore them. Speak to your GP. And don’t let them dismiss you just because you’re “young and healthy.” If it feels off, push for testing.

Symptoms in Younger Australians

Too many young people get told their symptoms are nothing. I was one of the lucky ones but I’ve met countless others who were brushed off for months. If you’re under 50 and getting nowhere with doctors, keep pushing, especially if you have:

• A family history of bowel cancer
• A known genetic condition (like Lynch syndrome or FAP)
• Inflammatory bowel disease (like Crohn’s or ulcerative colitis)

Age isn’t protection. Cancer doesn’t care what year you were born.

Understanding the Stages of Bowel Cancer

Once diagnosed, your cancer will be staged, basically, how far it’s spread. This helps shape your treatment plan and gives a rough idea of what’s ahead. In Australia, we usually use the TNM system:

• T (Tumour): How deeply it’s grown into the bowel wall
• N (Nodes): Whether it’s reached nearby lymph nodes
• M (Metastasis): If it’s spread to distant organs

From there, you get a stage between 0 and 4. Here’s what that actually means in real life:

Stage 0: Carcinoma in Situ

• Abnormal cells found only in the bowel’s inner lining
• Pre-cancerous, not invasive yet
• Usually picked up during a routine colonoscopy
• Treated with polyp removal (no chemo, no surgery)

Stage 1: Localised Cancer

• Cancer has grown into the bowel wall but hasn’t spread further
• Lymph nodes are clear
• Surgery is usually all that’s needed
• Chemo may not be necessary unless there are risk factors

Stage 2: Regional Spread

• Cancer has grown deeper, possibly into nearby tissues
• No lymph node involvement
• Subdivided into 2A, 2B, and 2C depending on depth
• Surgery is first-line, chemo may follow (especially for younger patients or higher-risk tumours)

Stage 3: Lymph Node Involvement

• Cancer has spread to nearby lymph nodes
• No distant spread yet
• Broken into 3A, 3B, or 3C depending on how many nodes
• Standard treatment: surgery and chemo (often FOLFOX or CAPOX)
• Radiation may be added for rectal cancers

Stage 4: Advanced or Metastatic

• Cancer has spread to distant organs (like liver or lungs)
• Usually not considered curable, but that doesn’t mean hopeless
• Treatment might include:
  • Chemo to shrink tumours or slow spread
  • Targeted therapies or immunotherapy, depending on tumour biology
  • Surgery for isolated metastases in some cases
  • Clinical trials
• Plenty of people with Stage 4 live well for years with the right support

How Fast Does Bowel Cancer Grow?

Most bowel cancers start as polyps, little growths in the bowel lining. These can take years to turn cancerous, but some subtypes (more common in younger adults) can grow fast.

How quickly it spreads depends on:

• Your genetics
• The type of tumour
• Your overall health
• Your immune system’s response

This is why early detection makes such a difference, catching it early means more treatment options and usually a better outcome.

Tests Used to Diagnose and Stage Bowel Cancer

If cancer is suspected, your medical team might order:

• Colonoscopy: Looks inside your bowel and removes suspicious growths
• Biopsy: Sends samples to the lab for confirmation
• CT or MRI scans: Check for spread
• PET scans: Sometimes used to spot hidden metastases
• Blood tests: Look for tumour markers like CEA
• Molecular testing: Checks for mutations (e.g. KRAS, BRAF, MSI) to help guide treatment

No two diagnosis journeys look exactly the same, your team will tailor everything to your situation.

Why Staging Actually Matters

Staging isn’t just a number. It helps decide:

• Which treatments you’ll be offered (surgery alone or chemo and beyond)
• Your prognosis and planning timeline
• What kind of support services you might need (nutrition, psychology, pain relief)
• Bigger-picture decisions, like fertility options and future planning

It doesn’t lock you into a set outcome but it gives you and your team a clearer path forward.

Living with Bowel Cancer at Any Stage

This disease doesn’t just mess with your body, it hits your mental health, your relationships, your job, your identity. Every stage comes with its own challenges. Every person feels it differently. But you’re not alone in this.

Helpful support might include:

• A medical team with early-onset bowel cancer experience
• Allied health experts like dietitians, psychologists, physios
• Peer support groups and online communities
• Charities like Bowel Cancer Australia offering practical help and connections
• Palliative care (not just end-of-life, it’s also about living better now)

Support matters. Don’t hesitate to ask for it or lean into it.

Final Thoughts

Bowel cancer doesn’t play fair. It shows up young. It hides behind everyday symptoms. It doesn’t care if you’ve got big plans for next year. But understanding the signs and what each stage means puts a little power back in your hands.

If you’ve made it this far, thank you. You’re either doing this for yourself or someone you love and either way, that matters. Keep asking questions. Keep demanding answers. And remember: no matter your stage, you’ve got people in your corner.