My MIL used to do this and I have heard of other people with dementia having phantom pains.
I suspect that its due to stress/anxiety/fear which stems from the dementia. Does your Mum (?) live by herself? My MIL did and she used to try everything to get people to stay with her because she was afraid of being by herself. Once there was someone with her, of course, she was fine and forget that she was afraid of being on her own - till everyone left, of course.
As I look back she has always wanted attention so she would go to the emergency room so much they knew her but each time let her tell it she’s having a heart attack or something else major so we rush to the hospital when we get there she’s smiling and chatting with the nurses mind you we work quite a distance from her
Omg this is so weird I can’t get with thisMy mother-in-law was very much like this. She had a personality disorder as a young adult which eventually morphed into dementia in her later years. She was widowed quite young and her need for attention became very demanding . She was living on her own in her own property and often used emotional blackmail on family members to fulfill her needs.
Throughout her life she used illness to try and manipulate the situation. In fact it became the norm in her adult years so that when the dementia developed, family members didn't realise at first that this was an additional illness. My husband and I would often visit to find my mother-in-law laid out on the sofa with her arms crossed on her chest. We would never ask what was wrong because it was always the same response anyway usually "I had chest pains or I've had a heart attack ". We would ignore this and just go into another room ,after a few moments my mother-in-law would get off the sofa and join us as if nothing had happened.
When she started having carer visits they soon wised up to the situation. When they first arrived she would talk to them in a slow whining voice as if she was ill and her voice was hoarse. Of course once she had their attention she reverted to a normal talking conversation voice within a few moments. The difficulty with this situation was it became increasingly problematic to realise when she was actually genuinely ill. We were so used to this type of behaviour that we had considered it normal for many years. Even when she eventually went into full-time care she still persisted with the same behaviours.