My 74yo mom has periph neur. i am her caregiver. falls often. she doesn't remember her odd behavior and next day is fine. has brain atrophy. why?

Many: Some atrophy normal but can be worsened by meds, toxicity , poor diet, illness and more.

Complicated: The first issue to address in an aged patient with pain is whether medication effects explain intermittent motor and cognitive derangements. A problem of this complexity requires the wisdom of a doctor. She might be developing a psychiatric illness or senility of old age.