When you or a loved one have been diagnosed with cancer, it can help to have a sense of tumor. Jokes and humorous anecdotes can lighten the mood and alleviate stress. Maintaining a positive attitude can help cancer patients deal with the toxic rigors of treatment. A good joke can't hurt, unless you just had abdominal surgery, in which case, yeah, it does hurt to laugh. Some of these cancer jokes are really funny, some are offensive, and some are really bad, but they'll grow on you, like cancer.