Grief (novel)
During the course of the novel, the ideas of the stages of grief are introduced. The stages are denial, anger, depression, and acceptance. The narrator, as well as other characters in the story, slowly passes through these stages in trying to deal with death.
Prolonged grief disorder
Although extremely painful, grief is the normal process of accommodating to a new life without the deceased loved one. Most bereaved survivors manage to get through the worst of their grief and continue to function and find meaning in life. Normal grief differs from PGD in that it is not as intense, persistent, disabling and life-altering and is not experienced as a severe threat to the survivor's identity, sense of self-worth, feeling of security, safety or hopes for future happiness. Although normal grief remains with the bereaved person far into the future, its ability to disrupt the survivor's life dissipates with time.