I was going to post this in the thread "When is suicide justified?", but I decided that it deserves it's own thread. Is refusing treatment, or refusing to prevent your own death the same thing as suicide? For example, there are religious groups who refuse blood transplants, or for an even more ambiguous suggestion, the same religious groups may refuse a vaccine that has been derived from blood. If they then are infected by the disease that the vaccine was for, is that suicide? If I go lie down on the train tracks, and simply don't move if the train comes, am I committing suicide, or merely choosing not to prevent my death by stepping off the tracks? Does it change if, when I lie on them, I'm not sure if the tracks are in use, or if I believe they are not? What if someone has a termnal illness, and chooses to do something that will likely kill them, in order to better the world or another persons life? Like diving into a river to try to save a drowning victim, or taking a bullet or knife for someone. How far off does their death have to be before this would be suicide? Since we are all going to die someday, does this mean that there is no such thing as suicide?