Suicide sort of occupies a different space with a strong stigma (and in many jurisdictions, legal barriers that can go as far as involuntarily committing someone to forcibly prevent them from committing suicide). Though that's culturally variable. There are many people who would not lift a finger to avoid a heart attack if they had the ability to do so, but who still would not actively kill themselves. A fairly common in-between is elderly people who choose to stay at home rather than go to the hospital, even if what they have is potentially treatable (they sometimes also have do-not-resuscitate and no-life-support orders entered, just in case someone takes them there).