What is Colorectal Cancer? A Patient's Guide

Colorectal cancer, often referred to as bowel cancer, is a type of cancer that begins in the colon or the rectum. These are parts of the digestive system, which is responsible for breaking down food, absorbing nutrients, and expelling waste. Understanding colorectal cancer is important because early detection and treatment can significantly improve outcomes.

What is colorectal cancer?

Colorectal cancer occurs when cells in the colon or rectum grow uncontrollably. The colon is the large intestine, and the rectum is the passageway that connects the colon to the anus. Cancer in these areas can start as non-cancerous polyps, which are small growths on the inner lining of the colon or rectum. Over time, some polyps can become cancerous if not removed.

Why does colorectal cancer matter?

Colorectal cancer is one of the most common types of cancer worldwide. It can affect both men and women, usually over the age of 50. However, it can occur at any age. Early stages of colorectal cancer often do not cause symptoms, making regular screening important. When symptoms do appear, they may include changes in bowel habits, blood in the stool, abdominal discomfort, and unexplained weight loss.

Risk factors and causes

Several factors can increase the risk of developing colorectal cancer:

• Age: The risk increases as you get older, particularly after age 50.
• Family history: Having a family history of colorectal cancer or polyps can increase your risk.
• Diet: A diet high in red and processed meats may increase risk.
• Lifestyle factors: Lack of physical activity, obesity, smoking, and heavy alcohol use are linked to higher risk.
• Medical conditions: Conditions such as inflammatory bowel disease, including Crohn's disease and ulcerative colitis, can increase risk.

Screening and diagnosis

Screening for colorectal cancer is crucial because it can detect cancer early, when treatment is most effective. Common screening tests include:

• Fecal occult blood test (FOBT): Checks for hidden blood in the stool.
• Colonoscopy: A procedure that uses a camera to examine the entire colon and rectum.
• Sigmoidoscopy: Similar to a colonoscopy but examines only the rectum and lower part of the colon.

Frequently asked questions

What are the early signs of colorectal cancer? Early stages often have no symptoms. When symptoms do occur, they may include changes in bowel habits, blood in the stool, and abdominal pain.

How can I reduce my risk of colorectal cancer? Maintain a healthy diet, exercise regularly, avoid smoking, and limit alcohol intake. Regular screenings are also important, especially if you have risk factors.

Is colorectal cancer hereditary? Yes, having a family history of colorectal cancer or polyps can increase your risk. Genetic conditions like Lynch syndrome also increase risk.

Can colorectal cancer be cured? If detected early, colorectal cancer can often be treated successfully with surgery, radiation, and chemotherapy.

What is the survival rate for colorectal cancer? Survival rates depend on the stage at which the cancer is detected. Early detection generally leads to better outcomes.

When to see a doctor

You should consult a doctor if you experience symptoms such as persistent changes in bowel habits, blood in the stool, unexplained weight loss, or persistent abdominal discomfort. Additionally, if you are over 50 or have risk factors, discuss screening options with your healthcare provider.

Decisions about your health should always be made in consultation with your healthcare provider.