Fatigue is commonly dismissed as something less serious than it may be. Well in this modern society this kind of condition is not surprising, a lot of people feel fatigue without having a condition, usually lack of sleep is the common case. This symptom is common for many diseases and conditions. Fatigue and cancer are connected due to the disease using your body’s energy. Fatigue caused by colon cancer is often accompanied by blood loss. It is a sign which appears in the progression of the disease and accompanied by weakness, and general malaise. If the fatigue is constant even though the sleep hours are sufficient and the diet is well-balanced, along with other symptoms of colorectal cancer, then it should not go un-ignored. You need to visit your doctor.