I agree with Andre, if you have hemorrhoids, they can bleed. They may also be the reason for your thin stools. If you had a colonoscopy in the past 6 months, you don't have colon cancer now. It generally takes a polyp about 10 years to turn into cancer. With you colonoscopy did they remove any polyps?
Do you know if colon cancer runs in your family?
Certain foods can produce gas. Me as much as I love radishes, they give me the worst gas on the planet. You might want to keep a journal of foods you eat and see if certain foods are giving you gas. What type of foods do you like to eat?
Try not to worry, I don't think you have colon cancer, especially if you were scoped in the last 6 months.
Edit to add if I remember correctly, if you take in a lot of air through your mouth, that can produce gas. Maybe something to consider.
rectal cancer - April 2004
46 yrs old at diagnoses
stage III C - 6/13 lymph positive
radiation - 6 weeks
surgery - August 2004/hernia repair 2014
chemo - FOLFOX
NED - 10 years and counting!