Rectal cancer symptoms do not always show up until the disease has advanced, so it is important to have routine screenings once you reach middle age. As rectal cancer advances, you may notice a change in your bowel movements. Both diarrhea and constipation that do not go away can signal rectal cancer. Blood in the stool, abdominal discomfort, feeling that you cannot completely empty your bowel, weight loss, and general fatigue are other symptoms to watch for.
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