Are you a Black man, 40 or over?
Get regular check ups. Get your prostate and colon checked.
[ UPDATE ]
A story told to me:
"Oh, I FEEL fine!
I don't know what's going on, on the INSIDE, but I FEEL fine!"
If you and a few of your friends get the exam, trust me when I say, you can actually joke about "the snap of that glove and the finger."
Your life may depend on it.