Sometimes they dont even catch it even if they're looking for it. 2 months ago i went to the hospital for what i thought was a heart attack, blood tests, ekg and a chest x-ray, 6 hours and $3,000 later, they said i was healthy and it was nothing. Same thing happened to a family friend, except he went to the hospital twice and told him it was nothing, a couple days later found him dead in his living room.