Colon cancer is a serious disease that will progress very slowly in your colon and is highly unnoticeable if you don't know the signs to keep watch for. Early detection of colon cancer is very important for successful treatment. By knowing certain warning signs and symptoms to look out for, you will have a better chance of recognizing if you have it and therefore can get the treatment that you need.It is not always easy for a doctor to know if a patient has colon cancer, even if they have all of the warning signs and symptoms. This is why it is generally advised that people over the age of 50 have a colonoscopy for an accurate diagnoses. Even if the results from the colonoscopy come out negative, patients are urged to get rechecked at least every 10 years. If the findings do show signs for the possibility of colon cancer, the patient should be checked and have a colonoscopy at least every two years. Below are some common symptoms to keep a look out for.Excess GasThis is an early symptom that can be easily overlooked because gas can be caused by so many things. But, if whenever you eat something your stomach feels extremely bloated and it feels like your stomach gets hard, this is a possible sign of a growing tumor in your system. A tumor can block the path of food waste from being able to exit your body and you will suffer from constipation as a result. If this type of problem occurs for an extended period of time, then you should see your doctor, especially if these symptoms are accompanied with swelling.Blood In StoolsAnother symptom that could indicate colon cancer is blood in your stools. Even though this symptom can be caused by many other problems such as anal fissures or a UTI, you should consult with your doctor immediately to rule out any serious problems.Rapid Weight FluctuationsRapid weight loss is another symptom that could lead to a diagnosis of colon cancer, especially if it is coupled with many of the other colon cancer symptoms. If your weight suddenly starts to decrease without taking any medications or you are not on any diet plan, you should consult your doctor. Colon cancer can sometimes lead to a loss in appetite and a feeling of nausea after eating.