When Memory Loss Isn't Just Ageing: Warning Signs You Shouldn't Ignore

Occasional forgetfulness is normal with age, but persistent memory lapses that interfere with daily functioning deserve closer examination. The timeline of cognitive decline is crucial—problems that worsen noticeably over a few weeks or months differ significantly from typical age-related forgetfulness and should not be dismissed.

Memory loss caused by neurological conditions rarely occurs in isolation. Families may observe additional signs including difficulty navigating familiar places, confusion, personality changes, unusual fear or irritability, sleep disturbances, or inability to perform routine tasks. A 61-year-old woman initially diagnosed with neurodegenerative dementia abroad presented with memory problems and visual-spatial difficulties that developed over roughly two months, accompanied by increasing fearfulness, irritability, and insomnia.

Upon seeking a second opinion in India, further investigation revealed a normal brain MRI but an unclassified neuronal antibody, with an FDG PET scan suggesting autoimmune encephalitis. This distinction proved significant because autoimmune encephalitis can mimic dementia symptoms—including memory problems, confusion, and behavioral changes—yet unlike many neurodegenerative conditions, some forms respond well to treatment, offering potential for recovery.