1. Genetics- a disease that can be caused by abnormality in a individual's DNA.A disease is due specifically to changes in a person's complement of DNA. Colorectal cancer It is treatable and curable,Treatments including dietary changes or replacement of the particular enzyme,certain substances in a diet can help prevent the build up.It impact the individual's life by life expectancy,or how fast it can be stable.

2. Environmental- are disease that can be directly attributed to environmental factors.Stress, physical and mental abuse, diet, expose to toxin.Skin cancer is  

Lifestyle choices- a disease that appear to increase in frequency in country's.Cardiovascular disease is narrowed