In some cases, colorectal cancer has no symptoms. The possible indicators of colorectal cancer may be due to other conditions as well. Individuals should consult a physician if the following symptoms appear:

• A change in bowel habits, including stools that are narrower than usual
  
  
• Blood (bright red or dark) in the stool or in the toilet after a bowel movement
  
  
• Bleeding from the rectum
  
  
• Diarrhea
  
  
• Constipation or a feeling that the bowel has not emptied
  
  
• An urge to have a bowel movement when there is no need
  
  
• Abdominal discomfort including cramps, gas pains, bloating or fullness
  
  
• Unexplained weight loss
  
  
• Fatigue
  
  
• Vomiting