Would it be possible to develope colon cancer large enough for blockage 5 years after an all clear colonoscopy?

Sometimes. Unfortunately yes. Some less common cancers have very rapid doubling times. And can grow quite large. A left colon cancer is more likely to obstruct than one on the right.

Related Questions

Why is it you hear about people who had squeaky clean colonoscopies only to have full blown colon cancer two years later?

Lynch syndrome. A majority of folks who will get colon cancer have some benign polyps first. Someone carrying of of the lynch family of mutations is likely to get colon cancer out of the blue, with no preceding polyp. You're still smart to get 'scoped every so often, and people known to the lynch's get scoped perhaps yearly. Read more...
Sometimes. There are flat lesions that can be missed on colonoscopy and there are also rapidly growing tumors to explain this. Read more...

Mom had colon cancer 10 years ago. I had a colonoscopy in 2006 and it was clean. When should I have another one? I'll be 35 in may.

Speak to family doc. I recommend speaking to your family doctor to discuss your case and based on your history have a health exchange of your options. Wishing you the best. Read more...
Now. With the family history, you can get a colonoscopy every 5 years, and then depending on several normal scopes, the GI specialist may lengthen your time interval. But since your last one was in 2006, you would be able to get another one now. Also, depending on if your scope showed, or will show any polyps, the specialist may shorten the time interval. Keep up the good work with your screening. Read more...
What genetic risk? There are now recognized multiple distinct biologic pathways that lead to colon cancer. Depending upon the age ; location of the cancer(s) in your first generation relatives, you may be at higher risk. Another consideration relative to needing earlier re-colonoscopy is your present clinical course--do you have colitis, bleeding, change in bowels, weight loss, abdominal pain? Check with your doc. Read more...
Colon Cancer Risk. This question is generating differences of opinion. In my practice i always look to my patient's GI specialist notes to see what they have recommended. After a colonoscopy the expert will usually recommend follow up colonoscopy in one, three, five, or seven years. I would bet your doctor has the answer you seek on when you need your follow up colonoscopy. It has been seven years so it may be now. Read more...

42 years old, had a grandparent (moms side) had colon cancer and 1st cousin (dad side)who had colon cancer. Do I need to get colonoscopy now or at 50?

Depends. If colon cancer was diagnosed before the age of 52 in your family, get colonoscopy now. Usually colonoscopy is advised at 50, If there is a family history of colon cancer then get it at 10 years before the age at which colon cancer was diagnosed in the relative who had cancer.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. Read more...

I am 43, based on my many symptoms and years of chronic constipation, would be wise to have a endoscopy and colonoscopy? My grandad had colon cancer

Yes. Talk to you primary care provider. Ask for a colonoscopy. If you get resistance talk to your health insurance company. You will get peace of mind from the scope. Hope this helps. Read more...
Colo screening. The uspstf recommends colon ca screening (one mean being colonoscopy) starting age 50 for most, earlier for those who are at higher risk. Higher risk population includes people with personal hx of colorectal ca or adenomatous polyps, personal hx of inflammatory bowel disease, strong family hx of colorectal ca or polyps, and known family history hereditary colo ca syndrome. Do you have any these? Read more...