I have to constantly fart and it smells really bad. my family has history of colon probs, also my grandparents on my mom side both died of liver cance?

Colon cancer: Although flatus or gas doesnt correlate with colon cancer, the bigger picture here is of you have a direct relative with /diagnosed of Colon cancer then you need a colonoscopy 20 years before your relative's age of diagnosis.( if diagnosed at 50, you need it at age of 30, then every 3-5 years after). You gas problems if not related to frequent diarrhea and bloody stools, maybe from the food you ea