I recommend getting a colonoscopy if you have any symptoms. There is a lot of stigma that prevents people from being proactive about this type of issue. My anecdote (M, 35) is that I got one after experiencing symptoms that turned out to be unrelated, but they did find pre-cancerous polyps so now I will be getting them more regularly. I received received meaningful early detection and peace of mind. Also aside from t…
> if you have any symptoms What kinds of symptoms are people actually seeing? Or, without graphic details of your bowel habits, is this a "you'd know it when you see it" type of situation, where it would probably be obvious? WebMD just says: change in bowel habits, blood in stool (would this be obvious?), anemia (how would you notice this?), unusual gas (uh, what is normal?), unexplained weight loss, fatigue, vomitin…
Blood in stool has a strong effect on the odor, so you'd probably notice it. If your stool smells dramatically worse (or at least different) than usual, in a maybe metallic way, that's how you know.
And "unusual" usually means unusual for you. So if you don't change your diet or habits, but suddenly get a ton of gas, fatigue, need to go to the bathroom way more often or have a different experience going to the bathroom, it's worth mentioning to do your doctor.