I m 19 year old and having tarry diarrhea nd mucus in stool that come and goes for 6 month along with severe weight loss & light abdominal pain & tongue infection.no family history of colon cancer so can it be ibs?am i at risk of having colon cancer?

Blood in stool and unintended weight loss warrant an investigation. It is not IBS. It would be prudent to see your doctor for an in-person evaluation and to ascertain if consultation with a gastroenterologist is warranted. Colon cancer is unlikely at your age. Wish you good health.

Having severe weight loss ( this is worrisome), tarry diarrhea and presence of mucus and abdominal pain warrants a visit to your PCP ASAP. You may be bleeding in your stomach , small intestine or in the colon. He will run some tests and refer you to GI if abnormal. Good luck!