The normal response to a major loss, such as the death of a loved one. Grief may also be felt by a person with a serious, long-term illness or with a terminal illness. It may include feelings of great sadness, anger, guilt, and despair. Physical problems, such as not being able to sleep and changes in appetite, may also be part of grief.
Source: NCI Dictionary of Cancer Terms2007-06-21Grief, Bereavement, and Coping With LossAflicción, duelo y manejo de la pérdida