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The symptomatology your mother is showing like frequent memory impairment, forgetting, no motivation, poor self esteem, low mood, irritability etc. may occur due to a lot of conditions.
- Early onset dementia is first possibility, as immediate memory impairment is seen in dementia, individual tend to forgets day to day things, past or remote memory remains intact. Due to continuous memory impairment there occurs low self confidence, poor motivation etc.
- Second thing although rare, these symptoms may be due to early stage of Parkinsons Disease
. Apart from the symptoms other clinical features like poor facial expression, tremors, slowness of movements etc. also seen. Depression is very common behavioral complaint observed.
- Depressive disorder may be third possibility, as in severe depression memory loss
is seen with irritability, also called as pseudo dementia
so as per my opinion visit a good psychiatrist
and take opinion, proper diagnosis at earlier stage will help in easy recovery.
Hope I cleared your doubt.