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Frozen sadness - what we have when we cannot really know what we have lost. This is what Pauline Boss illuminates, and helps to ease. It could be a loved one still alive yet lost to a person: a soldier son missing in action, or a constantly travelling spouse. In another kind of ambiguous loss, the loved one may be physically present but beyond a person's reach - such as someone with Alzheimer's disease.
A Wed, study studied this question.