Signs and Symptoms of Colorectal Cancer

Colorectal cancer can be asymptomatic (i.e., it may not cause symptoms). Blood in the stool is a common sign of the disease. Blood may be bright red or dark in color, and may not be noticeable. Chronic bleeding may result in iron deficiency anemia, which may cause fatigue and pale skin.

Other symptoms include the following:

  • Abdominal discomfort (e.g., pain, bloating, cramping, fullness)
  • Change in bowel habits
  • Constipation or diarrhea
  • Narrow stools
  • Nausea and vomiting
  • Unexplained weight loss

Publication Review By: Toomas Sorra, M.D., F.A.C.G.

Published: 14 Aug 1999

Last Modified: 22 Jul 2015