It turns out, as Dr. Anthony D. Mancini and his associates note in their review, that 50%-60% of people “are resilient and cope remarkably well with loss and would obviously not require professional intervention.”
Another 10%-20% come to grips with their grief more slowly, but eventually come to a state of homeostasis on their own timetable.
That leaves a subset of individuals whose symptoms escalate and then persist, perhaps even for years, compromising their function and well-being. People suffering this enduring, complicated grief remain an open and jagged emotional wound. They may become depressed, hopeless, bitter, detached, or wholly focused on their loss.