Complicated grief: Grief that is complicated by adjustment disorders (especially depressed and anxious mood or disturbed emotions and behavior), major depression, substance abuse, and post-traumatic stress disorder are Complicated grief is identified by the extended length of time of the symptoms, the interference in normal function caused by the symptoms, or by the intensity of the symptoms (for example, intense suicidal thoughts or acts).

Complicated grief may appear as a complete absence of grief and mourning, an ongoing inability to experience normal grief reactions, delayed grief, conflicted grief, or chronic grief. Factors that contribute to the chance that one may experience complicated grief include the suddenness of the death, the gender of the person in mourning, and the relationship to the deceased (for example, an intense, extremely close, or very contradictory relationship).

Grief reactions that turn into major depression should be treated with both drug and psychological therapy. One who avoids any reminders of the person who died, who constantly thinks or dreams about the person who died, and who gets scared and panics easily at any reminders of the person who died may be suffering from post-traumatic stress disorder.

Substance abuse may occur, frequently in an attempt to avoid painful feelings about the loss and symptoms (such as sleeplessness), and can also be treated with drugs and psychological therapy.

Also called unresolved grief.