Prolonged Grief Disorder

Abstract

Prolonged grief disorder is a clinical condition, classified by MeSH under bereavement, in which acute grief fails to integrate and remains intense, preoccupying, and disabling long past the point at which most mourners adapt. For the large majority of the bereaved, grief softens over the first year into a bearable, altered relationship with the loss; for a minority it does not, and the persistent yearning, identity disruption, and inability to accept the death come to resemble a disorder in their own right. After two decades of psychometric work the condition entered the ICD-11 and, in 2022, the DSM-5-TR. Cognitive psychology treats it not as grief that is merely too long but as a failure of the belief-updating and attachment-revision that ordinary grieving accomplishes.

Keywords: prolonged grief disorder, complicated grief, bereavement, DSM-5-TR, dual process model

Most people who lose someone they love grieve intensely and then, over months, find that the grief loosens its grip: it does not disappear, but it ceases to dominate, and life reorganizes around the absence. A minority do not make that transition. A year or more after the death they remain caught in the acute grief of the first weeks — pulled constantly toward the person who is gone, unable to believe the loss is real, their sense of who they are fractured by it — and the condition is disabling rather than merely painful. Clinical description of this stalled grief is old: Erich Lindemann characterized the symptomatology of acute grief and the work of grieving in 1944 (Lindemann, 1944). What is new is its recognition as a distinct mental disorder, prolonged grief disorder, after evidence accumulated that its symptoms are separable from depression and anxiety, endure, and respond to a treatment designed for them (Prigerson et al., 2021).

What Prolonged Grief Disorder Is

Prolonged grief disorder is the name now given, in both major diagnostic systems, to a grief that does not integrate. The ordinary trajectory of grief is one of acute distress that gradually yields to a settled, if sorrowful, accommodation to the loss; the person comes to accept the reality of the death, the pull toward the deceased softens, and the capacity to engage with ongoing life returns. In prolonged grief disorder that trajectory stalls. The mourner remains preoccupied with the deceased or consumed by yearning for them, finds the loss impossible to accept, and continues to experience the intense emotional pain, identity disruption, and withdrawal from life that characterize the first weeks of a bereavement — only now a year or more has passed (Prigerson et al., 2021).

The condition has had several names, and the history matters for reading the literature. Lindemann's 1944 account of acute grief already distinguished a normal course from a morbid one (Lindemann, 1944). Later work used complicated grief and traumatic grief for much the same picture, and the path to a formal diagnosis was neither short nor uncontested. Competing criteria sets were proposed, the two major classification systems diverged — the ICD-11 and the DSM eventually settling on different duration thresholds, as the criteria below show — and there was sustained opposition to recognizing grief as a distinct mental disorder at all before the DSM-5-TR adopted prolonged grief disorder in 2022 (Prigerson et al., 2009; Prigerson et al., 2021). Cognitive psychology frames the disorder through the function grieving normally serves: a death violates a dense network of overlearned models and expectations built around the living person, and grieving is the slow revision of those models toward the reality of absence. On this reading prolonged grief disorder is not grief that is simply too long but grief in which that revision has not happened — the attachment representations are not updated, and the mind continues to run on the premise that the person is still there to be sought (O'Connor, 2019).

Diagnostic Criteria

The criteria that define prolonged grief disorder were not written from the armchair; they were derived empirically. Across a series of studies, candidate symptoms were subjected to item-response and combinatoric analyses to find the set that most sensitively and specifically identified bereaved people at heightened risk of enduring distress and dysfunction (Prigerson et al., 2009). The resulting criteria require a core disturbance — persistent, pervasive yearning for the deceased, or preoccupation with them — together with a cluster of accompanying symptoms, present to a disabling degree and well beyond the culturally expected period of mourning.

The two diagnostic systems differ in their details. The ICD-11 requires persistent and pervasive grief, with the core yearning or preoccupation, enduring beyond a period of at least six months after the loss and clearly exceeding social and cultural norms. The DSM-5-TR, which added prolonged grief disorder in 2022, sets the duration threshold at twelve months since the death for adults (six for children and adolescents) and specifies that the yearning or preoccupation occur nearly every day, accompanied by at least three of eight symptoms: identity disruption, a marked sense of disbelief, avoidance of reminders, intense emotional pain, difficulty reintegrating into life, emotional numbness, a feeling that life is meaningless, and intense loneliness. The validation of these DSM-5-TR criteria, together with the revised PG-13-R screening scale designed to map onto them, confirmed that the symptom set forms a coherent, unidimensional construct, is temporally stable, and is statistically distinct from post-traumatic stress disorder, major depression, and generalized anxiety (Prigerson et al., 2021). Table 1 sets the two systems side by side.

The duration thresholds are the most contested part of the criteria, and they are set deliberately high. The point of a twelve-month floor is not that grief should resolve within a year but that the diagnosis should not pathologize the acute grief that is normal and expected in the months after a death. By requiring that intense, disabling symptoms persist past the window in which most mourners are already integrating the loss, the criteria aim to identify the minority whose grief has genuinely stalled rather than the majority who are grieving on a normal, if painful, schedule.

How It Differs from Normal Grief

The central difficulty in defining a grief disorder is that grief itself is not a disorder, and the overwhelming majority of bereaved people never need clinical care. Any criterion for prolonged grief must therefore draw a line through a continuous landscape of normal suffering. Two bodies of evidence make the line defensible. The first is the finding that bereavement outcomes are heterogeneous, and that the modal trajectory is resilience — a stable, low-distress course — rather than chronic grief or even a slow recovery from high distress (Bonanno, 2004). Prolonged grief disorder is thus one minority path among several, not the default that most mourners narrowly avoid.

The second is the shape of the normal grief course over time. A prospective test of the long-taught stage theory of grief found that acceptance was the dominant response throughout, and that the negative indicators — disbelief, yearning, anger, depression — all peaked within roughly the first six months after the loss and declined thereafter (Maciejewski et al., 2007). That normal decline is exactly what fails to occur in prolonged grief disorder, which is why the authors of that study noted that people scoring high on grief indicators well beyond six months might warrant further evaluation. The dual process model of coping supplies the mechanism behind a healthy course: adaptation is an oscillation between confronting the loss and attending to the demands of ongoing life, with respite built into each (Stroebe & Schut, 1999). On this account prolonged grief disorder is a grief stuck at the loss-oriented pole, unable to alternate into restoration, so the belief-updating that the oscillation drives never completes (O'Connor, 2019).

The disorder is also distinct from the conditions it most resembles. Depression shares the low mood and withdrawal, and post-traumatic stress disorder shares the intrusive imagery and avoidance, but the validation studies show that prolonged grief disorder separates statistically from both, as well as from generalized anxiety, with the yearning and preoccupation that are specific to loss carrying the distinction (Prigerson et al., 2021). This separability is the empirical core of the argument that prolonged grief deserves its own diagnosis rather than treatment as a subtype of depression.

Prevalence and Risk

How common is prolonged grief disorder? A systematic review and meta-analysis of studies in adults bereaved by non-violent causes found a pooled prevalence of 9.8% — close to one in ten of those studied — with higher mean age associated with higher prevalence (Lundorff et al., 2017). That figure is the standard epidemiological anchor, but it comes with cautions the authors stressed: the underlying studies are methodologically heterogeneous, only half used registry-based probability sampling, and the estimate is for non-violent loss specifically. Because that estimate is for non-violent loss specifically, the one-in-ten figure is best read as a floor for the general bereaved population rather than a universal rate.

The risk factors sort into features of the loss, the mourner, and the circumstances. Violent or unexpected death, the loss of a child or a spouse, a close or dependent relationship with the deceased, and prior mental health difficulties all raise the probability of a prolonged course. The cognitive-behavioral conceptualization of the disorder adds a set of maintaining mechanisms that operate after the loss: insufficient integration of the death into autobiographical memory, negative global beliefs and catastrophic misinterpretations of one's own grief reactions, and anxious and depressive avoidance strategies that prevent the confrontation with the loss that integration requires (Boelen et al., 2006). These are not merely predictors but targets — each names something a treatment can try to change.

Worked Example

The distinction between an integrating and a prolonged grief course can be made quantitative with a simple decay model of acute grief intensity. Let G(t) denote the intensity of acute grief on a normalized scale where G = 100 is the peak of acute grief in the first weeks and G = 0 is full integration, and let intensity decay exponentially, G(t) = 100 · e^−t/τ, where t is months since the death and τ is a time constant that sets how fast the grief resolves. Take a clinical threshold T = 30, below which grief is no longer disabling.

For a typical integrating course, take τ = 3 months. Then G(6) = 100 · e⁻² = 13.5 and G(12) = 100 · e⁻⁴ = 1.8: by the six-month mark the grief has already fallen well below the clinical threshold, and by twelve months it is near zero. The course crosses T = 30 at t = −3 · ln(0.30) = 3.6 months. For a prolonged course, take τ = 12 months. Then G(6) = 100 · e^−0.5 = 60.7 and G(12) = 100 · e⁻¹ = 36.8: at the ICD-11 six-month checkpoint the grief is still twice the threshold, and at the DSM-5-TR twelve-month checkpoint it remains above it. This course does not cross T = 30 until t = −12 · ln(0.30) = 14.4 months.

The two courses obey the identical exponential law — the same process of grief resolution is running in both — but a fourfold difference in the time constant is what separates a grief that clears the threshold at 3.6 months from one still disabling at a year. This is the quantitative content of the diagnostic duration criteria: placing the assessment point at six or twelve months is a way of reading off which time constant a mourner is on, because by then the integrating course has long since dropped below the threshold while the prolonged course has not. The model is an illustration of the logic, not a measurement instrument; real grief trajectories are noisier than a single exponential, and the threshold and time constants are not quantities the field estimates from a formula. The point is the shape of the dependence — that a slow enough resolution keeps a normal process above a clinical line long enough to warrant a diagnosis.

Treatment

The clinical case for prolonged grief disorder as a distinct condition rests heavily on treatment evidence, because a disorder that responds to a therapy designed for it and not to therapies for adjacent conditions is thereby shown to be its own thing. The pivotal result is the first randomized controlled trial of a grief-targeted psychotherapy, complicated grief treatment, which outperformed standard interpersonal psychotherapy, roughly doubling the response rate and producing faster improvement (Shear et al., 2005). Complicated grief treatment combines techniques drawn from the treatment of trauma — revisiting the story of the death, confronting avoided reminders — with work on restoring a sense of purpose and reconnecting with life, directly addressing the stalled oscillation the dual process model describes.

A later, four-arm trial sharpened the picture by pitting the psychotherapy against an antidepressant. Complicated grief treatment with placebo produced a far higher response rate than the antidepressant alone, the addition of the antidepressant did not improve the psychotherapy's effect on grief itself (though it helped co-occurring depressive symptoms), and adding the psychotherapy improved the outcome of the medication (Shear et al., 2016). The grief-specific psychotherapy, in other words, is the active ingredient, and medication is at best an adjunct for comorbid depression. This specificity is exactly what distinguishes the disorder from depression, for which antidepressants are a first-line treatment.

The treatment evidence also explains why general grief counseling for the newly bereaved has a poor track record. A comprehensive meta-analysis found that bereavement interventions had only a small average effect that did not survive to follow-up — but that interventions targeting people already showing marked difficulty adapting to the loss had outcomes comparable to psychotherapies for other disorders (Currier et al., 2008). The lesson is that treatment should be reserved for those whose grief has stalled, not offered indiscriminately to everyone who has suffered a loss, since most will integrate the loss without help and the untargeted studies were diluted by controls who improved on their own. The cognitive-behavioral conceptualization gives the targeted treatments their theoretical rationale, specifying the appraisals and avoidance behaviors that maintain the disorder and that therapy must change (Boelen et al., 2006).

Discussion

Reading prolonged grief disorder as a failure of belief-updating ties it to the wider cognitive science of loss rather than leaving it a free-standing clinical label. If grieving is the revision of attachment representations toward the reality of absence, then a disorder of grief is a disorder of that revision, and the clinical features follow: the persistent yearning is the unrevised model still seeking the person, the disbelief is the failure to accept the premise the death supplies, and the avoidance is precisely what blocks the updating from occurring (O'Connor, 2019; Boelen et al., 2006). The dual process model specifies the normal mechanism — the oscillation that drives the updating — and the disorder is what happens when that oscillation jams at the loss-oriented pole (Stroebe & Schut, 1999).

The recognition of the diagnosis was contested, and the objections are worth stating. The chief worry was that formalizing a grief disorder would medicalize normal suffering, pathologizing the love and pain that are the appropriate human response to a death. The high duration thresholds and the requirement of marked, disabling impairment are the criteria's answer to that worry: they are calibrated to exclude the resilient and recovering majority and to catch only the minority whose grief has genuinely stalled (Bonanno, 2004; Maciejewski et al., 2007). Whether the line is drawn in exactly the right place remains an open empirical question, but the statistical separability of the symptom cluster and its specific response to a targeted treatment are strong evidence that there is a real condition on the far side of the line (Prigerson et al., 2021; Shear et al., 2016).

Current Directions

The disorder's formal arrival in the DSM-5-TR in 2022 has shifted the research front from establishing the diagnosis to deploying it. One strand is measurement: the validation of the PG-13-R scale against the DSM-5-TR criteria gives clinicians and researchers a short instrument that maps onto the diagnosis, and work continues on how screening thresholds perform across cultures and bereavement types (Prigerson et al., 2021). A second strand is neurobiological, treating grief as a learning process and asking what distinguishes the brains and bodies of those who integrate a loss from those who do not — differences in rumination, in inflammation, and in cortisol regulation have been offered with some evidence, and neuroimaging has located the largest effects of a loss in those with the most severe grief reactions (O'Connor, 2019). A third extends the treatment literature beyond the original trials, adapting grief-targeted therapy to new delivery formats and populations and testing whether the maintaining mechanisms the cognitive-behavioral model names can be targeted earlier, before a grief has fully stalled (Boelen et al., 2006). The open questions are no longer whether prolonged grief disorder exists but how to detect it early, whom to treat, and how the failure of integration is realized in the brain and body.

Common Misconceptions

Prolonged grief disorder means there is a normal timetable for grief that everyone should meet.

The duration thresholds are set high precisely to avoid pathologizing normal grief, which has no fixed schedule. The diagnosis targets grief that remains intense and disabling past the point at which most mourners are already integrating the loss, not grief that is simply still present (Prigerson et al., 2021; Maciejewski et al., 2007).

Prolonged grief disorder is just depression after a death.

Its symptoms separate statistically from depression, post-traumatic stress disorder, and anxiety, and it responds to a grief-specific psychotherapy rather than to antidepressant medication alone, which is the opposite of what would be expected if it were depression (Prigerson et al., 2021; Shear et al., 2016).

Most bereaved people will develop prolonged grief disorder if they do not get counseling.

Resilience is the most common outcome of bereavement, and pooled prevalence of the disorder after non-violent loss is about one in ten. General grief counseling offered to everyone shows little benefit; targeted treatment for those whose grief has stalled is what works (Bonanno, 2004; Lundorff et al., 2017; Currier et al., 2008).

The diagnosis is a brand-new invention with no clinical history.

The formal diagnosis is recent, but the clinical picture is old: Lindemann described morbid grief reactions in 1944, and the modern criteria are the product of two decades of psychometric research under the names complicated and traumatic grief (Lindemann, 1944; Prigerson et al., 2009).

Glossary

Acute grief.

The intense, preoccupying grief of the early weeks and months after a loss, normal in itself and expected to soften as the loss is integrated.

Bereavement.

The objective situation of having lost someone to whom one was attached, as distinct from the grief reaction to it.

Complicated grief treatment.

A grief-targeted psychotherapy combining revisiting of the loss with restoration of purpose, shown in trials to outperform interpersonal therapy and antidepressant medication alone.

Complicated grief.

An earlier name for the same stalled, disabling grief now diagnosed as prolonged grief disorder; the treatment literature largely uses this term.

Continuing bonds.

The maintenance of a transformed, ongoing relationship with the deceased after integration, as distinct from the unrevised attachment of a stalled grief.

DSM-5-TR.

The 2022 text revision of the Diagnostic and Statistical Manual, which added prolonged grief disorder with a twelve-month duration threshold for adults.

Dual process model.

The account of coping with bereavement as oscillation between loss-oriented and restoration-oriented demands; prolonged grief is understood as oscillation stuck at the loss-oriented pole.

Grief.

The emotional, cognitive, and physiological response to loss, of which prolonged grief disorder is a stalled and disabling form.

ICD-11.

The eleventh revision of the International Classification of Diseases, which recognizes prolonged grief disorder with a duration threshold of at least six months.

Integration.

The normal outcome of grieving, in which the mind revises its models to accommodate the loss and acute grief gives way to a settled, altered relationship with it.

PG-13-R.

The revised Prolonged Grief-13 scale, a short self-report instrument validated to map onto the DSM-5-TR criteria for the disorder.

Prolonged grief disorder.

The diagnosis for grief that remains intense, preoccupying, and disabling past the expected period, with persistent yearning or preoccupation as its core feature.

Resilience.

A stable, low-distress trajectory through bereavement; the modal outcome of loss and the reason a grief disorder must be carefully bounded.

Restoration-oriented coping.

Attending to the secondary demands a loss creates — new tasks, roles, and routines — and taking respite from the loss itself; the pole a prolonged grief fails to reach.

Yearning.

The persistent longing for and pull toward the deceased that is the specific, defining symptom of prolonged grief disorder and separates it from depression.

Key Researchers

Paul A. Boelen

. Professor of Clinical Psychology at Utrecht University and the ARQ National Psychotrauma Centre in the Netherlands; built the cognitive-behavioral conceptualization of prolonged grief and contributed to the criteria work for the DSM-5-TR. ORCID

George A. Bonanno

. Professor of Clinical Psychology at Teachers College, Columbia University; mapped the heterogeneity of bereavement outcomes, showing resilience to be the modal trajectory and framing prolonged grief as one minority path among several. ORCID

Holly G. Prigerson

. Professor of Sociology in Medicine at Weill Cornell Medicine and Director of the Cornell Center for Research on End-of-Life Care; led the empirical derivation and psychometric validation of prolonged grief disorder criteria, from the 2009 field trial to the PG-13-R scale validated against the DSM-5-TR definition. ORCID

M. Katherine Shear

. Marion E. Kenworthy Professor of Psychiatry at Columbia University and founder of the Center for Prolonged Grief; developed and trialed complicated grief treatment, the targeted psychotherapy whose efficacy established prolonged grief as a distinct, treatable condition. ORCID

Margaret S. Stroebe

. Emeritus Professor at Utrecht University and the University of Groningen in the Netherlands; co-originated the dual process model of coping with bereavement, the oscillation framework against which prolonged grief is understood as stalled loss-oriented processing. ORCID

Frequently Asked Questions

What is prolonged grief disorder?

It is a diagnosis for grief that stays intense, preoccupying, and disabling well past the expected period of mourning, with persistent yearning for or preoccupation with the deceased as its core feature (Prigerson et al., 2021).

How long must grief last to count as prolonged grief disorder?

The ICD-11 requires persistent grief beyond at least six months, while the DSM-5-TR requires at least twelve months since the death for an adult. The thresholds are set high to avoid pathologizing the normal acute grief of the first year (Prigerson et al., 2021).

How is it different from normal grief?

Normal grief tends toward resilience or gradual integration, with the negative symptoms typically peaking within about six months and declining. In prolonged grief disorder that decline does not happen and the grief remains disabling (Bonanno, 2004; Maciejewski et al., 2007).

Is prolonged grief disorder the same as depression?

No. Its symptoms separate statistically from depression, post-traumatic stress disorder, and anxiety, and the defining yearning for the deceased is specific to loss. It responds to grief-specific therapy rather than to antidepressant medication alone (Prigerson et al., 2021; Shear et al., 2016).

How common is it?

A meta-analysis of adults bereaved by non-violent causes found a pooled prevalence of about 9.8%, roughly one in ten, with higher rates associated with higher mean age (Lundorff et al., 2017).

What raises the risk of developing it?

Violent, sudden, or unexpected deaths, the loss of a child or partner, a dependent relationship with the deceased, and maintaining factors such as avoidance of reminders and catastrophic appraisals of one's own grief all raise the risk (Boelen et al., 2006).

Can prolonged grief disorder be treated?

Yes. A grief-targeted psychotherapy, complicated grief treatment, outperforms general interpersonal therapy and antidepressant medication alone, establishing the condition as distinct and treatable (Shear et al., 2005; Shear et al., 2016).

Does everyone who is bereaved need grief counseling?

No. General counseling offered to all bereaved people shows little lasting benefit, because most integrate the loss without help. Treatment works when it is targeted at those whose grief has stalled (Currier et al., 2008).

References