Many cases of colorectal cancers have no symptoms. In those cases with symptoms, they might present with one or more of the following:

• Change in bowel habits (diarrhoea or constipation) which persists for a few weeks
• Passing blood in the stool
• Passing mucus in the stool
• Abdominal pain or discomfort in the lower abdomen
• Smaller calibre stool
• Weight loss with no obvious reason

Updated:: 13/03/2019 []