Is it possible to have colon cancer, and yet only have one symptom, which is abdominal discomfort, which is on and off and can be absent for months and then come back, at age 21- and again, no other symptoms except the on and off discomfort pain, which usually is only there in the morning the days it does appear?
I don't think you have colon cancer and to clear things up, ask your doctor to order you to have a colonoscopy to be done, as this test will tell all if there's anything to tell re your colon and abdominal pain. You may have diverticulitis which cause great abdominal discomfort.
Your answer is yes; however to make sure one always needs a colonoscopy. with new technology, they are painless. You are medicated before the procedure and will remember nothing. I encourage you to take the next step for your peace of mind. Good luck!