My best friend, someone I met when we were seniors in HS back in '69, my main wrenching on cars buddy, died in '04 because he ignored a spot on his side until it was too late to stop what was going on.
Since I had moved to a different state in '93 I rarely saw him and did not know about it until he called me one day and told me he had 6 months to live. Had I been there I'm sure I would have found out about it and hounded him to get it checked out. Over the years we shared many adventures and had a lot of fun doing stuff with cars. I think of him often and really miss him, I've even had dreams occasionally where we are together wrenching on something.
So if you have something you're wondering what it might be, PLEASE get it checked out. Ignoring it could possibly cut your life much shorter than it could be and leave your family and friends with a big hole in their heart.