1. Fatigue
Fatigue could be caused by stress or lack of sleep, but cancer is also a cause of fatigue. 
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2. Weight Loss
Controlled weight loss when you are overweight is good, but a sudden weight loss is never a good sign. In extreme cases, it could indicate colon cancer, since your immune system and bowel movement would be seriously hampered in that case.
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3. Bowel Movement
Improper bowel movement, which can be understood from how frequently you visit the bathroom, or the size and colour could very well be a symptom of cancer.
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4. Abdominal Pain
Abdominal cramps, which have been happening for a long time, are a serious indication of colon and rectal cancer.
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5. Bloody Stool
We know how uncomfortable one might feel talking to their doctors about bloody stool, but you should know that the longer you wait, the more damage it can cause. Bloody stool not only indicates colon cancer, but also rectal cancer.
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