Strokes, mini strokes etc. do not come out of nowhere. They have a beginning like anything else in nature. On march 6, mount Etna erupted suddenly "out of nowhere" so to speak. This of course is nonsense. We expected it to erupt. A stroke is the same. However, the research is poised to solve it only after it has occurred. The precursor metabolic events for stroke are the same as for virtually every chronic degenerative disease known to man.