dementia

Overview
Dementia is a general term for a group of brain disorders that affect memory, thinking, communication, and daily functioning. It is not a normal part of aging and typically gets worse over time. Dementia results from damage to brain cells that interferes with their ability to communicate.

Why It’s Important
Dementia significantly impacts a person’s independence and quality of life, as well as the lives of caregivers. It’s a leading cause of disability in older adults and currently has no cure, making early detection and supportive care essential.

Quick Facts

  • Primarily affects adults over 65, though early-onset dementia can occur before age 65

  • An estimated 55 million people worldwide live with dementia (WHO)

  • Dementia is progressive and chronic

  • Alzheimer’s disease is the most common type, but there are others with different causes and symptoms

Types of Dementia

  • Alzheimer’s disease: Most common type; involves buildup of amyloid plaques and tau tangles

  • Vascular dementia: Caused by reduced blood flow to the brain, often after strokes or small vessel disease

  • Lewy body dementia: Involves abnormal protein deposits (Lewy bodies); often includes hallucinations and movement issues

  • Frontotemporal dementia (FTD): Affects personality, behavior, and language due to damage in the brain’s frontal and temporal lobes

  • Mixed dementia: A combination of two or more types, often Alzheimer’s and vascular dementia

  • Other causes: Parkinson’s disease dementia, Huntington’s disease, and certain infections or injuries

What Happens in the Body
Brain cells become damaged or die, leading to a breakdown in the brain’s communication system. The exact process varies by type:

  • In Alzheimer’s, toxic proteins accumulate and interfere with neuron function.

  • In vascular dementia, poor blood flow causes brain tissue damage.

  • In FTD, abnormal proteins affect brain regions controlling behavior and speech.

Common Signs and Symptoms

  • Memory loss, especially recent events

  • Difficulty with planning or problem-solving

  • Confusion about time or place

  • Language problems, like struggling to find words

  • Mood changes, such as depression, anxiety, or aggression

  • Poor judgment or decision-making

  • Withdrawal from social activities

  • Symptoms vary depending on the type of dementia

Diagnosis

  • Cognitive testing (e.g., Mini-Mental State Exam)

  • Neurological exam

  • Imaging tests like MRI or CT to rule out other causes and identify brain changes

  • Blood tests to exclude infections, thyroid issues, or vitamin deficiencies

  • Neuropsychological testing for a deeper assessment of memory and thinking skills

  • Seek evaluation if memory loss interferes with daily life or progresses rapidly

Treatment and Management

  • No cure, but treatment can slow progression and manage symptoms

  • Medications:

    • Cholinesterase inhibitors (e.g., donepezil, rivastigmine) for Alzheimer’s

    • Memantine for moderate to severe symptoms

  • Lifestyle interventions:

    • Cognitive stimulation, routine, physical activity

    • Support for caregivers

    • Modifying the home for safety

  • Behavioral therapy for mood and aggression

  • Palliative care and advance care planning may be needed in later stages

Risks and Complications

  • Increased risk of falls and injuries

  • Depression, anxiety, and emotional distress

  • Wandering and getting lost

  • Malnutrition and dehydration

  • Progressive decline leads to complete dependence and ultimately death

Who Is at Risk

  • Older age is the biggest risk factor

  • Family history or genetics (especially APOE-e4 gene for Alzheimer’s)

  • Heart disease, high blood pressure, diabetes

  • Traumatic brain injury (TBI)

  • Smoking, excessive alcohol use

  • Low physical activity or poor diet

  • Low levels of education and social engagement

Related Conditions

  • Delirium (sudden confusion, often mistaken for dementia)

  • Parkinson’s disease

  • Depression (can mimic early dementia symptoms)

  • Mild cognitive impairment (MCI) – can progress to dementia

When to See a Doctor

  • If memory problems, confusion, or personality changes interfere with daily life

  • If symptoms develop suddenly or worsen quickly

  • If a loved one seems unaware of their symptoms or is becoming unsafe alone

  • Early diagnosis allows for better planning and care

Last Updated: June 19, 2025