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Understanding Colorectal Cancer: Causes, Risks, and Prevention

Alan Lucks | MD

Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on December 1st, 2023.

Key Takeaways

  • Most cases begin as adenomatous polyps that take 10-15 years to transform into cancer, making early detection through colonoscopy highly effective at prevention.

  • The 5-year survival rate exceeds 90% when caught in stage I (localized), but drops to 14% once it spreads to distant organs, emphasizing the critical importance of screening.

  • Screening guidelines now recommend starting at age 45 for average-risk individuals, or 10 years before the age when a first-degree relative was diagnosed if there's family history.

  • Consuming more than 18 ounces of red meat weekly increases risk by 28%, while eating 3+ servings of whole grains daily can reduce risk by 17%.

  • Warning symptoms like persistent changes in bowel habits lasting more than 4 weeks, blood in stool, or unintentional weight loss over 10 pounds warrant immediate medical evaluation.

Colorectal cancer is a type of cancer that develops in the colon or rectum, which are parts of the large intestine. The colon is about 4 to 6 feet long, while the rectum is only 4 to 6 inches long. Colorectal cancer often starts as small growths called polyps that form in the inner lining of the colon or rectum.

What Causes Colorectal Cancer?

The exact cause of colorectal cancer is not known, but several factors can increase your risk, including:

  • Personal or family history of colon polyps or colorectal cancer

  • Inflammatory bowel diseases, such as ulcerative colitis or Crohn's disease

  • Inherited genetic disorders, such as familial adenomatous polyposis (FAP) or Lynch syndrome

  • Diet high in red and processed meats and low in fruits and vegetables

  • Lifestyle factors, such as smoking and heavy alcohol consumption

  • Age, with risk increasing after age 50

Symptoms of Colorectal Cancer

Colorectal cancer may not cause symptoms in its early stages. As the disease progresses, some common symptoms may include:

  • Changes in bowel habits, such as diarrhea, constipation, or narrowing of the stool

  • Rectal bleeding or blood in the stool

  • Abdominal pain, cramping, or bloating

  • Weakness or fatigue

  • Unintended weight loss

If you experience any of these symptoms, it's important to consult your healthcare provider for proper evaluation and diagnosis.

Understanding Colorectal Cancer: Causes, Risks, and Prevention

Preventing Colorectal Cancer

While some risk factors for colorectal cancer cannot be changed, such as age and family history, there are steps you can take to lower your risk:

  • Maintain a healthy diet rich in fruits, vegetables, and whole grains

  • Limit consumption of red and processed meats

  • Exercise regularly and maintain a healthy weight

  • Avoid smoking and limit alcohol intake

  • Undergo regular colorectal cancer screening, especially if you are over 50 or have a family history of the disease

The Importance of Early Detection

Colorectal cancer is highly treatable when detected early. Regular screening can help find polyps before they become cancerous or detect cancer at an early stage when treatment is most effective. The American Cancer Society recommends that people at average risk begin regular screening at age 45.

Several screening options are available, including colonoscopy, sigmoidoscopy, and stool-based tests. Talk to your healthcare provider about which screening method is right for you based on your age, risk factors, and personal preferences.

Remember, early detection is key to improving colorectal cancer survival rates. By understanding the causes, risks, and prevention strategies, you can take steps to protect your colorectal health and reduce your risk of developing this disease.

For more information on colorectal cancer, visit:

The Bottom Line

Regular screening starting at 45 can prevent most cases by detecting and removing precancerous polyps before they become malignant. Lifestyle changes like limiting red meat, increasing fiber intake, and maintaining a healthy weight can cut your risk significantly. If you're experiencing persistent bowel changes or concerning symptoms, Doctronic can help you get prompt answers and appropriate care.

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