Grief is as normal reactive to a significant personal loss. It is characterized by affective, cognitive, behavioural and physiological symptoms. The grieving process is usually divided in five different stages, but in most cases presents a benign course, with decreased suffering and better adaptation to the new context. However, when high levels of emotional suffering or disability persist over a long time period, it becomes a case of complicated grief (CG), which should be adequately addressed.

To review the characteristics of CG, the evidence that supports it as an individual pathological entity, and its place in current classification systems.

We performed a bibliographic search in Pubmed and PsychInfo, of articles written in English, Portuguese and Spanish, containing the key words: grief, bereavement, psychiatry, classification.

The main issue regarding grief is the degree to which it is reasonable to interfere with a usually benign process. Since DSM-III bereavement has been referred to as an adaptive reaction to an important loss, which should not be diagnosed as major depressive disorder or adjustment disorder. However, DSM-5 has stated persistent complex bereavement disorder as an independent entity. In fact, CG fulfils the general criteria of every psychiatric syndrome, namely regarding specific diagnosis criteria, differential diagnosis from depressive disorders and post-traumatic stress disorder, and improvement with adequate treatment.

It is important to correctly approach CG, since it presents with characteristic diagnosis features and much improvement may be achieved once adequate treatment is provided.

The authors have not supplied their declaration of competing interest.