Early Signs of Colon Cancer Most People Miss—And When to Take Action
April 2, 2026
March is Colon Cancer Awareness Month, and there's no better time to talk about something that doesn't always make the conversation easy: the early signs of colorectal cancer.
Unfortunately, this disease is often quiet. It doesn't always announce itself with dramatic pain or obvious symptoms. In fact, many people feel completely fine while cancer is developing. That's what makes knowing what to look for so important.
Colorectal cancer is the second leading cause of cancer death in the U.S. when men and women are combined, and it's now the number one cause of cancer death in adults under 50. But here's what's encouraging: when it's caught early, survival rates top 90%. Getting familiar with your body's early warning signals can make all the difference.
At a Glance
- Colorectal cancer often causes no symptoms in its early stages, which is why regular screening matters so much.
- Early signs can include changes in bowel habits, rectal bleeding, unexplained fatigue, and unintentional weight loss.
- Screening is recommended starting at age 45 for average-risk adults and earlier if you have risk factors.
- When caught at a localized stage, the five-year survival rate is over 90%.
Why Colorectal Cancer So Often Goes Undetected Early
Colorectal cancer earns its reputation as a silent disease. It typically starts as a small polyp, a benign growth on the lining of the colon or rectum, that takes years to develop into cancer. During that window, most people have zero symptoms.
By the time symptoms do appear, the cancer has often progressed. That's the core problem. Many people put off seeing a specialist when they experience symptoms, either dismissing what they’re feeling or assuming something else is causing it.
Can you have colorectal cancer without any symptoms?
Yes, absolutely. Early-stage colorectal cancer is frequently asymptomatic, which is exactly why routine screening, even when you feel perfectly healthy, is so valuable. A colonoscopy can detect and remove precancerous polyps before they ever become a problem.
The takeaway: don't wait for something to feel wrong. If you're 45 or older, or younger with risk factors, talk to your doctor about scheduling a screening.
The Early Signs Worth Paying Attention To
These symptoms aren't always cancer; many have other explanations. But if they're new, persistent, or getting worse, they deserve a conversation with your doctor.
Changes in Bowel Habits That Don't Go Away
One of the most common early signals is a change in what's normal for you; whether that's new constipation, diarrhea, or stools that have become narrower than usual. When changes last more than a few weeks, it's worth bringing up with a provider.
Blood in Your Stool or Rectal Bleeding
Blood in the stool is never normal, even if it seems minor. It can show up as bright red blood, darker stools, or what looks like pink-tinged water in the toilet bowl. Most of the time, rectal bleeding has a benign explanation, like hemorrhoids, which we see and treat all the time at our Birmingham clinic. But it can also be a sign of colorectal cancer, and you won't know until you've been evaluated.
Unexplained Fatigue or Weakness
When a colorectal tumor bleeds slowly into the digestive tract, the blood loss can build up over time and lead to anemia, a low red blood cell count. Anemia often shows up as persistent tiredness or weakness that doesn't improve with rest. Sometimes it's caught on routine bloodwork before a person ever notices a symptom.
Unexplained Weight Loss
Losing weight without trying can be a sign that something's off. When the body is fighting cancer, it can lose weight even without changes in diet or exercise. Combined with any of the other symptoms above, unexplained weight loss is a reason to get checked sooner rather than later.
Abdominal Pain, Cramping, or Bloating That Persists
Occasional bloating or cramping is completely normal. But if you're experiencing ongoing abdominal discomfort (pain that comes back frequently, or a persistent feeling of fullness or pressure), that's your body asking for attention.
How Common Is Colon Cancer — And Who's at Risk?
Colon cancer is more common than most people realize, and it’s increasingly affecting younger adults. The rates among adults aged 20–49 have been rising by 3% per year from 2013 to 2022; a trend that's baffling researchers and pushing younger people into conversations they didn't expect to be having.
Right now, 1 in 5 colorectal cancer cases is diagnosed in someone under 55.
IRisk factors worth knowing:
- A personal or family history of colorectal cancer or polyps.
- A history of inflammatory bowel disease (Crohn's disease or ulcerative colitis).
- A diet high in red or processed meat and low in fiber.
- Smoking or heavy alcohol use.
- Physical inactivity or obesity.
- Inherited conditions like Lynch syndrome or familial adenomatous polyposis (FAP).
That said, many colon cancer patients have no family history of the disease. You don't need a family history to be at risk.
What Happens During a Colonoscopy?
The gold standard for screening is a colonoscopy. It allows your doctor to view the entire colon and rectum, identify abnormalities, and remove polyps right then and there, all in one procedure. Most people go home the same day and return to normal activities within 24 hours.
Other screening options, like stool-based tests, are also available and can work well for some patients. If a stool test comes back positive, a follow-up colonoscopy is the next step.
Frequently Asked Questions
At what age should I get screened for colon cancer?
For most adults at average risk, screening starts at 45. If you have a family history of colorectal cancer or other risk factors, talk to your doctor about starting earlier.
Is colorectal cancer curable if caught early?
When colorectal cancer is found at a localized stage (before it spreads), the five-year survival rate is over 90%. Early detection truly changes outcomes.
What's the difference between colon cancer and rectal cancer?
Both start in the large intestine and share many symptoms and risk factors. The difference is location: colon cancer begins in the upper, longer portion of the large intestine, while rectal cancer starts in the final few inches before the anus.
Take This Month as Your Cue
Colorectal cancer is one of the most preventable forms of cancer, and one of the most treatable when it's caught early. The symptoms it produces early on are easy to brush off, but paying attention to what's changed in your body, and acting on it, is one of the most powerful things you can do for your health.
Schedule Your Colonoscopy at the Alabama Colon & Rectal Institute.
Don't put it off another year. Our board-certified colorectal surgeons offer compassionate, confidential care for patients across the Birmingham area.
Call the Alabama Colon & Rectal Institute at (205) 651-9208 or contact us online to schedule your appointment with a Birmingham colorectal specialist.