Grief is a natural response to loss and is not a mental illness. It is the emotional suffering you feel when something or someone you love is taken away. Often, the pain of loss can feel overwhelming. You may experience all kinds of difficult and unexpected emotions. Although conventionally focused on the emotional response to loss, grief also includes physical, behavioral, cognitive, social, cultural, and philosophical elements.
The Five Stages of Grief
A theory developed by psychiatrist Elisabeth Kübler-Ross suggests that we go through five distinct stages of grief after the loss of a loved one: Denial, anger, bargaining, depression, and finally acceptance.
Even if it is not a comprehensive model and we know that grief is not linear, it still serves as a good basis to better empathize with the person who is grieving (any type of grief).