I don't know why im so fearful of colon cancer at my age of 22 i have a poor appetite but no other symptoms like weight loss or fever how common is the cancer in a 22 year old? is lack of appetite a symptom of colon cancer?

Unusual: I had answered with the data on colon cancer to your question. From age 20-30 the percentage of people with colon cancer is a little over 1 %. Remember that most people of any age do not get colon cancer. At your age this is very low on the list of causes. Anxiety, thyroid disease, stress, bad diet are all much more likely. See your doc so that you can stop worrying and live life happily.

It is very uncommon : 90 % of colon cancers diagnosed are over 50. In the years 2000-2003, the percentage of cases diagnosed under age 20 was 0% and from 20-34 was 0.9%. Family history in 1st degree relatives increases your risk as does some of the hereditary colon polyp diseases and smoking. A change in bowel habits, rectal bleeding , or abd pain/cramps are the common sxs of colon cancer, not just a poor appetite.

Anxiety disorder?: You may have a phobic anxiety disorder. Please check with your doctor for further elucidation of fear and possible treatment.