Ageing
Alcohol abuse
Insufficient fruit and vegetable intake
Lack of regular exercise
Low fibre and high fat diet
Obesity
Poor oral hygiene
Smoking
Type 2 diabetes
Family history of inherited colorectal cancer syndromes
Immediate family (parent, siblings, or child) younger than 60, with colorectal cancer or polyps
Inflammatory bowel syndrome
Personal history of colorectal cancer or polyps
source: Cancer Association of South Africa website