what are the early symptoms of rectal cancer?
['A change in your bowel habits, such as diarrhea, constipation or more-frequent bowel movements.', 'Dark or red blood in stool.', 'Mucus in stool.', 'Narrow stool.', 'Abdominal pain.', 'Painful bowel movements.', 'Iron deficiency anemia.', "A feeling that your bowel doesn't empty completely."]