###Human: Why have my 80-year-old grandmother's hallucinations increased with time? ###Assistant: Hello Dear dementia with hallucinations may be common in old age people. Intermittent episodes of delirium may increase the future risk of dementia. Most commonly infections ( urinary, respiratory), electrolyte imbalance, hormonal imbalance, drugs or recent surgery cause delirium. Dementia may be due to Alzheimer's or multi infract or Louie body or Multisystemic atrophy etc. For delirium we may give low dose of benzodiazapines . What is the cause to be evaluated by MRI brain, serum electrolytes, blood sugar levels, thyroid profile and urine examination. so please consult your neurophysician he will examine and treat you accordingly. Take care.