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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
Yes, the Mayo Clinic offer information on rectal cancer. You can find the information at mayoclinic.com/health/colon-cancer/DS00035 and http://www.mayoclinic.org/rectal-cancer/
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.
In patients with colon or rectal cancer, the p53 gene is mutated 70% of the time