Skip to main content

Colon Cancer

Overview

Colon cancer is one of the most common cancers worldwide. It starts in the colon, the organ responsible for removing fluids and nutrients from the food we eat, then pushing the remaining waste into the rectum for expulsion from the body.

Who is at Risk?

Colon cancer affects men and women equally. People of all ages and nationalities can be affected by colon cancer. However, certain factors increase the risk:

  • Age, especially after age 50
  • Family history of polyps and colon cancer
  • Obesity
  • Smoking
  • A diet high in fat and/or low in fiber
  • A diet heavy in red and processed meats
  • Moderate to heavy alcohol intake

Signs & Symptoms

  • Changes in bowel habits, such as diarrhea lasting more than 3 days or constipation lasting more than 2 weeks
  • Changes in the color or shape of stool
  • Rectal bleeding and/or blood in the stool
  • Stomach discomfort or cramping
  • Fatigue or weakness
  • Unexpected weight loss
  • Anemia

When to Start Screening

Patients with average risk and no family history should begin colon cancer screening at age 45. If you have a high risk or family history of polyps and colon cancer, consult your primary care provider to determine when screening should start.

Additionally, this page offers several resources, including a screening schedule, risk assessment tools, and contact information for local clinics. 

Ask Yale
Health
Chatbot