"Having a family health history of colorectal (colon) cancer can make you more likely to get colorectal cancer yourself. If you have close family members with colorectal cancer, collect your family health history of colorectal and other cancers, and share this information with your doctor. Be sure to have any screening tests that your doctor recommends. If you have had colorectal cancer, make sure that your family members know about your diagnosis, especially if you have Lynch syndrome.
Why is it Important to Know Your Family Health History?
If you have a family health history of colorectal cancer, your doctor may consider your family health history when deciding which colorectal cancer screening might be right for you. For example, if you have a close family member who had colorectal cancer at a young age or have multiple close family members with colorectal cancer, your doctor may recommend the following:
- start screening at a younger age,
- get screened more frequently,
- use colonoscopy only instead of other tests, and
- in some cases, have genetic counseling.
The genetic counselor may recommend genetic testing based on your family health history. When collecting your family health history, be sure to include your close relatives: parents, brothers, sisters, children, grandparents, aunts, uncles, nieces, and nephews. List any cancers that each relative had and at what age he or she was diagnosed. For relatives who have died, list age and cause of death. You can use the My Family Health Portrait tool to collect your family health history.
What is Lynch Syndrome and Why is it Important to Know if You Have it?
In some cases, colorectal cancer is caused by an inherited genetic condition called Lynch syndrome, also known as hereditary nonpolyposis colorectal cancer or HNPCC. About 3% (1 in 30) of colorectal cancer cases are due to Lynch syndrome. People with Lynch syndrome are much more likely to develop colorectal cancer, especially at a younger age (before 50), and women with Lynch syndrome are much more likely to get endometrial (uterine) cancer. People with Lynch syndrome also have an increased chance of getting other cancers, including ovarian, stomach, liver, kidney, brain, and skin cancer. If you or your family members are found to have Lynch syndrome, your doctor can help you take steps to reduce your risk of getting cancer in the future or to find it early if you get it..."Lynch syndrome
