Grief is a reaction to a significant loss. It is most frequently an unhappy and painful emotion triggered by the death of a loved one. These same emotions can also be experienced by someone with a terminal illness who expects to die, or by someone with a chronic condition who must deal with a loss of autonomy. The end of a significant relationship often results in a grieving process as well.

Everyone experiences grief in their own way, but generally there are recognized stages to the process of mourning. It starts at the recognition of a loss and extends to the eventual acceptance of it. Responses will vary depending upon the circumstances associated with the death.

For example, if the deceased suffered from a chronic illness, the death may have been anticipated, and may even come as a relief of suffering. If the death was accidental or violent, coming to a stage of acceptance may take longer.