The different types of ambiguous Grief: Physical The person is physically absent but psychologically present, such as through military deployment or incarceration. Psychological The person is physically present but psychologically absent, such as through dementia, addiction, or brain injury. I experienced ambiguous grief after my 14 year old son suffered a life altering brain injury that took his ability to walk, talk and eat. He went from being a regular 14 year old boy to wheelchair bound unab