Simply put, colon cancer is the cancer of the colon or large intestine. The most common cause of colon cancer is the growth of precancerous cells called polyps. These polyps undergo subsequent mutations to turn into cancerous cells. Sedentary lifestyle, diet deficient in fiber, and family history are held responsible for colon cancer though the immediate cause of this disease is not yet known. Common symptoms of colon cancer are rectal bleeding, diarrhea, constipation, fatigue, weight loss, gas, abdominal pain and cramps. Here is a list of the best herbs that help you prevent colon cancer. Incluude these herbs in your diet along with high-fiber fruits and green leafy vegetables to keep colon cancer at bay.