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The cause of rectal cancer are not all known. However, you should get a rectal exam if you experience unusual tiredness, nasuea, bloody stools, abdominal cramps, and a change in bowel habits. These may be signs of rectal cancer.
Vomiting
Some symptoms of rectal cancer include changes in bowel movements, abdominal discomfort, weight loss with no known reason, constant fatigue, unexplained anemia, and the feeling that a bowel does no empty all the way.
Rectum is the last part of a human's Digestive tract. If your digestive system is malfunctioning, the most common manifestation will either be diarrhea or constipation. But in a rectal cancer, the initial symptom will be constipation with severe gastric pain. To learn more about rectal cancer, read here:http://www.emedicinehealth.com/rectal_cancer/article_em.htm
There is a slight increase of risk for rectal cancer in the individual who smokes