Ambiguous loss is a form of grief that has no closure, no clear ending, and often no social recognition, and the term was coined by family therapist Dr. Pauline Boss at the University of Minnesota in the 1970s. Boss identified two types. The first is physical absence with psychological presence, as when a loved one goes missing, is abducted, or leaves without explanation. The second is physical presence with psychological absence, as when a loved one lives with dementia, addiction, severe mental illness, or estrangement. In both cases, the person grieving cannot mourn fully because the loss will not stay still. Ambiguous loss, Boss wrote, is the most stressful kind of loss because it defies resolution. I am Dr. Aria Chen, and I mention ambiguous loss often because so many people describe feeling stuck without understanding why. They think they should be over it. The truth is, some losses cannot be over. They can only be carried differently.

What Does the Research Say?

Dr. Pauline Boss's decades of research, including work with families of 9/11 victims and soldiers missing in action, shows that ambiguous loss generates symptoms that overlap with but are distinct from PTSD and complicated grief. A 2019 study in the Journal of Family Nursing found that family members caring for loved ones with Alzheimer's disease scored significantly higher on ambiguous loss measures than bereaved family members, and reported worse physical health outcomes. Research by Dr. Holly Prigerson at Weill Cornell Medicine estimates that around 10 percent of bereaved people develop prolonged grief disorder, but ambiguous loss complicates this further because there is nothing concrete to bereave.

Why Does This Happen?

Human beings evolved to resolve loss through rituals, funerals, stories, shared witnessing. These rituals create a before and an after, a container for grief. Ambiguous loss offers no container. The person who used to love you is still breathing, but does not know your name. The parent who walked out thirty years ago might come back tomorrow, or might not. The brain keeps searching for closure that never arrives, and the search itself becomes exhausting. Dr. Boss emphasizes that the problem is not the griever's inability to cope. The problem is the situation's inability to resolve.

How Does It Affect Daily Life?

People living with ambiguous loss often describe themselves as frozen. They hesitate to make plans because they do not know if the person will return. They feel guilty for moving on and guilty for not moving on. They may struggle to explain their grief to friends who do not understand why a loss without a death still counts. Research by Dr. Kenneth Doka on disenfranchised grief highlights that when a society does not recognize a loss, the griever often internalizes the silence as shame. This is why estrangement grief, for example, tends to feel so isolating.

What Actually Helps?

Dr. Boss developed six guidelines for coping with ambiguous loss, and they remain the most helpful framework in the literature. They include finding meaning, tempering mastery, reconstructing identity, normalizing ambivalence, revising attachment, and discovering hope. The key insight is that healing does not require resolution. It requires the ability to hold two truths at once, he is still my father, and he is already gone. Support from people who can sit with contradiction rather than try to fix it is invaluable. Writing letters you do not send, Dr. James Pennebaker's expressive writing method, and attending groups with others who understand the shape of ambiguous grief can all help. If your loss does not fit into any neat story, you are not failing at grief. You are feeling something that language barely reaches. I will sit with whatever version of the loss feels most present today, and we do not need to name it cleanly to honor it.