Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Rectal Cancer ?
    ### Response:
    Signs of rectal cancer include a change in bowel habits or blood in the stool. These and other signs and symptoms may be caused by rectal cancer or by other conditions. Check with your doctor if you have any of the following:         -  Blood (either bright red or very dark) in the stool.
    