If I choose not to suffer from UC, I'm going to get some kind of cancer.
We're talking about
an increased risk of lymphoma from 2/10,000 to 4/10,000. You're still vastly more likely to die in a car crash, for example. Furthermore, if you "choose" to continue suffering from UC rather than treating the active disease, you're putting yourself at an increased risk of colorectal cancer due to chronic inflammation.
I strongly recommend reading this: http://www.ccfa.org/assets/pdfs/risk-and-benefits-transcript
dx'ed UC pancolitis 5/12 w/ moderate-severe inflammation
past meds: asacol hd, VSL#3, apriso, rowasa, xifaxan, 6mp, cortifoam, pentasa, cimzia, canasa, butyrate
current meds: flagyl, cipro, prednisone, remicade, methotrexate, cholestyramine, cortenema
supplements: folic acid, vitamin d, potassium