Kübler-Ross's theory of dying outlines five stages that terminally ill patients may experience when learning of their diagnosis: denial, anger, bargaining, depression, and acceptance. Denial involves rejecting the diagnosis, anger occurs when facing the reality of impending death, bargaining involves attempts to control the situation, depression results from truly acknowledging the diagnosis, and acceptance is coming to terms with one's mortality. Grief is the psychological response to loss that includes feeling hollow. It involves dealing with emotions like guilt, sadness, and missing the deceased through crying or struggling to accept their death.