My diet changed a year ago after I was made redundant (not eating as well as I did as I have very little income) and for the past three weeks I have been farting a lot.  Is this a sign of bowel cancer?  My mother died from it 30 years ago so I am wary of it
Instead of worrying about the flatulence, you need to be worried about the family history. It is essential you enroll in a screening program immediately as you are a high risk candidate. Flatulence can be a very unspecific symptom, unless you have abdominal pains with cramping, mass or lump feeling in your abdomen, bleeding while passing stools. Change your diet habit slowly identifying the causative food.