I've posted this in the kidney canceer section. It must be appropriate for most others also.
When people have good intentions and say things like, "We could all be hit by a bus anytime and could die. So don't worry about having cancer. So I asked, "For how many minutes in the last year have you thought about dieing from having been hit by a bus?" Of course the answer was zero. So I asked, "Have you ever had a song get stuck in your head and you can't get it out?" The answer is that everyone has had that happen. So I explained that having cancer is always in our thoughts. 24 hours a day, 7 days a week, month in and month out. It never leaves our thought process. It is like having a song get stuck in your head. It just doesn't go away. They start to get the idea.