Memory Loss

Memory complaints span a wide spectrum. Normal age-related change involves slower retrieval with intact recognition and preserved function. Mild cognitive impairment involves objective deficits on testing with daily function largely maintained, and roughly 10 to 15 percent of those affected progress to dementia annually. Dementia involves cognitive decline that impairs independent living. The single most useful clinical step is excluding reversible contributors, because a meaningful minority of memory complaints have a treatable cause. Vitamin B12 deficiency, hypothyroidism, depression presenting as pseudodementia, obstructive sleep apnoea, chronic alcohol use, and anticholinergic medication burden all produce genuine cognitive impairment that improves when addressed. Anticholinergic load in particular is under-recognised and is associated with dementia risk in large cohort studies. For risk reduction, the 2024 Lancet Commission identified 14 modifiable factors accounting for around 45 percent of dementia cases worldwide, including hearing loss, hypertension, physical inactivity, smoking, diabetes, social isolation, depression and untreated visual impairment. Hearing aid use in high-risk adults reduced cognitive decline in the ACHIEVE trial, one of the few positive randomised results in this field. The multidomain FINGER trial combining diet, exercise, cognitive training and vascular monitoring also showed benefit. The supplement picture is largely disappointing. Ginkgo biloba failed to prevent dementia in the large GEM trial. Multivitamins showed modest cognitive benefit in COSMOS-Mind, an intriguing but preliminary signal. Citicoline and phosphatidylserine have limited support, omega-3 helps mainly where intake is low, and B vitamins slow atrophy only in people with elevated homocysteine.

• •Forgetting recently learned information or repeating questions
• •Difficulty retrieving names and words
• •Misplacing objects and being unable to retrace steps
• •Trouble following complex conversations or instructions
• •Getting lost in familiar places
• •Difficulty managing finances or medications
• •Relying increasingly on notes and reminders for previously easy tasks

• •Normal cognitive ageing
• •Vitamin B12 or folate deficiency
• •Hypothyroidism
• •Depression and chronic anxiety
• •Obstructive sleep apnoea and chronic sleep deprivation
• •Anticholinergic, sedative and opioid medication burden
• •Chronic alcohol use
• •Untreated hypertension and diabetes
• •Hearing and vision loss reducing cognitive input
• •Alzheimer disease and other neurodegenerative pathology

Memory loss reflects either reversible physiological disruption — B12 or thyroid deficiency, depression, sleep deprivation and apnoea, anticholinergic and sedative medication, alcohol, delirium — or progressive neuropathology, most often Alzheimer amyloid and tau pathology, vascular cognitive impairment from small vessel disease, Lewy body disease, or frontotemporal degeneration. Vascular risk factors accelerate almost all of these pathways.