How common is it for someone my age to have colon cancer with no family history?

Low: You need to keep in eye on things because you can develop colon cancer without a family history. Your chances are lower but the threat is still there.

Not common but could: While colon cancer is not common in your age group, it is possible, even with no known family history. Only 30% of colon cancer is hereditary, and often families don't know about or are confused about their family history. If you have symptoms, such as rectal bleeding, change in bowel habits, or weight loss, you should be evaluated by your physician. He/she can decide if you need further workup.

Not very common: Most nonfamilial colon cancer occurs after 50 years of age...Well after. Screening is recommended starting at age 50. However, no age is too young, so symptoms such as blood in the stool, bowel blockage, unexplained weight loss etc should always be checked out by your doctor.

Age and blood: There are no single red flags that characterize all colon cancers. It is very rare to develop colon cancer at your age unless you have a genetic disorder passed through the family tree. Once u approach fifty screening with a colonoscopy is indicated. Many early colon cancers are picked up and cured before they cause symptoms. People who are not screened can present with pain, blood, constip, etc.