I was watching a TV show the other day and this popped into my mind. You just realized you have a medical condition that's fatal if left untreated. If you were planning to commit suicide, but concerned for your family's reaction after the fact, would you just keep this condition to yourself and forgo treatment? I mean it would be perfect since it would be a "natural" death and won't be looked at as a suicide. But, who knows, suicides most often happen in a certain moment.