Learn About Early Signs of Colon Cancer

Understanding Colon Cancer Basics

Colon cancer, also called colorectal cancer, starts in the large intestine (colon) or the rectum. The colon is the final part of your digestive system, about 5 feet long, and its main job is to absorb water and store waste before it leaves your body. Cancer happens when cells in this area grow in an uncontrolled way and form tumors.

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According to the American Cancer Society, colon cancer is the third most common cancer diagnosed in the United States. In 2023, an estimated 106,970 new cases of colon cancer were diagnosed, with about 44,850 deaths from this disease. While these numbers may seem high, the good news is that survival rates have been improving. The five-year survival rate for colon cancer is about 64% overall, but this number jumps to 91% when the cancer is caught early and hasn't spread beyond the colon.

Colon cancer usually develops slowly over many years. It often starts as small, noncancerous growths called polyps that form on the inside of the colon. Not all polyps become cancer, but some do if they're left untreated. This slow growth gives people a real opportunity to find and remove polyps before they turn into cancer.

Understanding the basics of colon cancer helps you recognize why screening and early detection matter so much. The disease typically affects people over age 50, though it can develop at any age. Risk factors include family history, certain genetic conditions, inflammatory bowel disease, obesity, smoking, and heavy alcohol use.

Practical Takeaway: Colon cancer develops slowly over years, which means there's time for screening tests to catch it early or find precancerous polyps. Knowing your personal risk factors and family history helps you make informed decisions about screening timing and methods.

Common Early Symptoms to Notice

Many people with early colon cancer don't experience any symptoms at all, which is why screening tests are so important. However, when symptoms do appear, they can provide warning signs that something needs medical attention. Being aware of these signs means you can contact your doctor rather than waiting or assuming the symptoms will go away on their own.

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One of the most common early symptoms is a change in bowel habits that lasts more than a few weeks. This might include constipation, diarrhea, or alternating between the two. Your bowel movements might become narrower than usual, or you might feel like you can't completely empty your bowels. These changes feel different from your normal pattern and persist for several weeks rather than a day or two.

Another important symptom is blood in the stool or rectal bleeding. You might notice bright red blood on toilet paper, in the toilet, or in your stool. Sometimes the blood isn't visible to the naked eye but shows up in a test. It's important to know that bleeding can come from many causes including hemorrhoids and anal fissures, but persistent bleeding should always be evaluated by a doctor to determine the cause.

Additional early symptoms that warrant medical attention include:

• Abdominal discomfort, cramping, or pain that doesn't go away
• Unexplained weight loss, especially if you haven't been dieting or exercising more
• Persistent fatigue or weakness that interferes with daily activities
• A feeling of fullness or bloating that seems unusual for you
• Anemia symptoms, which can include shortness of breath and dizziness

It's crucial to remember that having one or more of these symptoms doesn't mean you have cancer. Many conditions cause these symptoms, including irritable bowel syndrome, Crohn's disease, colitis, and infections. However, symptoms lasting more than two weeks deserve a conversation with your doctor.

Practical Takeaway: Keep track of any changes in your bowel habits or unexplained symptoms lasting more than two weeks. Write down what you're experiencing and when it started. This information helps your doctor understand your situation and decide what tests might be needed.

Risk Factors That Increase Your Likelihood

Understanding your personal risk factors helps you make decisions about when to begin screening and how often to get tested. Risk factors are characteristics or exposures that make colon cancer more likely to develop, though having risk factors doesn't mean you will definitely get cancer.

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Age is one of the most significant risk factors. The American Cancer Society reports that about 90% of colon cancer cases occur in people age 50 or older. For this reason, most health organizations recommend that people at average risk begin screening at age 45 to 50. However, if you have risk factors or symptoms, your doctor might recommend starting screening earlier.

Family history plays an important role in your colon cancer risk. If a close relative such as a parent, sibling, or child has had colon cancer, your risk increases. The risk is even higher if that relative was diagnosed before age 50 or if multiple family members have had the disease. If you have a family history of colon cancer, talk with your doctor about screening starting before age 50.

Certain inherited genetic conditions significantly raise colon cancer risk. Lynch syndrome, also called hereditary nonpolyposis colorectal cancer (HNPCC), accounts for about 2 to 4% of all colon cancer cases. People with Lynch syndrome have a 70% to 80% chance of developing colon cancer during their lifetime. Familial adenomatous polyposis (FAP) is another inherited condition where people develop hundreds to thousands of polyps in the colon, creating very high cancer risk. If you know your family carries one of these conditions, genetic counseling and testing options exist.

Lifestyle factors also matter. Obesity increases colon cancer risk, as does smoking and heavy alcohol consumption. A diet high in red and processed meats and low in fiber, fruits, and vegetables is associated with higher risk. People with inflammatory bowel diseases like Crohn's disease or ulcerative colitis have increased colon cancer risk and may need different screening schedules.

Practical Takeaway: Create a list of your personal risk factors and your family's medical history, particularly any cases of colon cancer, polyps, or Lynch syndrome. Share this information with your doctor during routine visits. This helps your doctor recommend the right screening timeline for you rather than relying on average-risk guidelines.

How Screening Tests Work and What They Detect

Screening tests look for cancer or precancerous polyps in people without symptoms. Several different screening options exist, and your doctor can help you choose the one that works best for your situation. The goal of screening is to find cancer early when treatment is most successful, or to find and remove polyps before they become cancer.

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Colonoscopy is often considered the gold standard screening test. During a colonoscopy, a doctor uses a long, flexible tube with a camera called a colonoscope to examine the entire colon and rectum. The procedure takes about 30 minutes, and the doctor can remove any polyps found during the exam. If polyps are removed, you typically don't need another colonoscopy for 10 years if no cancer is found. Colonoscopy requires sedation and preparation the day before, including taking a strong laxative to clear the colon.

Flexible sigmoidoscopy is similar to colonoscopy but examines only the lower portion of the colon. This test takes about 20 minutes and usually doesn't require sedation. However, it only views about one-third of the colon, so it may miss polyps or cancer higher up. If precancerous polyps are found, you'll need a colonoscopy to examine the entire colon.

Fecal tests check stool samples for signs of cancer. The high-sensitivity fecal immunochemical test (FIT) detects blood in stool that isn't visible to the naked eye. The multitarget stool DNA test (Cologuard) looks for both blood and abnormal DNA in stool samples. These tests are non-invasive and don't require preparation or sedation. However, they're less sensitive than colonoscopy, meaning they miss some cancers and polyps. A positive result on a fecal test requires follow-up with colonoscopy.

CT colonography (virtual colonoscopy) uses CT imaging to create detailed pictures of the colon. It requires the same preparation as