Dementia is a general term for a decline in cognitive function — including memory, thinking, problem solving, language, and judgment — that is severe enough to interfere with a person’s daily life and activities. Dementia is not a single disease but rather an umbrella term that describes a group of symptoms caused by various brain disorders.
Dementia is not a normal part of aging. While the risk of dementia increases with age most older adults do not develop dementia. Understanding what dementia is, what causes it, how it is different from normal aging, and what resources are available can help affected individuals and their families navigate this challenging condition more effectively.
How common is dementia
Dementia affects millions of people worldwide and its prevalence is growing as the population ages:
- An estimated 55 million people worldwide are living with dementia
- In the United States more than 6 million people have Alzheimer’s disease — the most common form of dementia
- Dementia is one of the leading causes of disability and dependency among older adults globally
- The number of people with dementia is expected to nearly triple worldwide by 2050
Types of dementia
There are many different types of dementia each caused by different brain changes and associated with different symptoms and progression patterns:
- Alzheimer’s disease — the most common form of dementia accounting for 60 to 80 percent of cases. Alzheimer’s is characterized by the accumulation of amyloid plaques and tau tangles in the brain that damage and destroy nerve cells.
- Vascular dementia — the second most common type caused by reduced blood flow to the brain due to strokes or other vascular conditions. Symptoms may appear suddenly following a stroke or gradually over time.
- Lewy body dementia — caused by abnormal deposits of a protein called alpha-synuclein in the brain. Symptoms include cognitive fluctuations, visual hallucinations, movement problems similar to Parkinson’s disease, and REM sleep behavior disorder.
- Frontotemporal dementia — caused by damage to the frontal and temporal lobes of the brain. Often affects personality, behavior, and language more than memory especially in the early stages. Tends to affect younger people — often in their 50s and 60s.
- Mixed dementia — a combination of two or more types of dementia occurring simultaneously. Alzheimer’s disease combined with vascular dementia is the most common form of mixed dementia.
- Parkinson’s disease dementia — dementia that develops in some people with Parkinson’s disease typically later in the course of the disease
- Creutzfeldt-Jakob disease — a rare and rapidly progressive fatal brain disorder caused by abnormal prion proteins
Dementia vs normal aging
It is normal for cognitive abilities to change somewhat with age. Normal aging may involve occasional forgetfulness such as misplacing objects or forgetting names but then remembering them later. Dementia involves a more significant and progressive decline that goes beyond normal aging.
Key differences between normal aging and dementia:
- Normal aging — occasionally forgetting a name but remembering it later, making an occasional error in managing finances, sometimes needing help with technology, feeling weary of work and social obligations
- Dementia — forgetting recently learned information and not remembering it later, making repeated errors in managing finances or being unable to manage them at all, increasing difficulty with familiar tasks, withdrawing from social activities due to cognitive changes
If you are concerned about your own cognitive function or that of a loved one it is important to consult with a physician rather than assuming that changes are just normal aging.
Warning signs of dementia
The Alzheimer’s Association has identified ten warning signs of dementia:
- Memory loss that disrupts daily life especially forgetting recently learned information
- Challenges in planning or solving problems
- Difficulty completing familiar tasks at home, at work, or at leisure
- Confusion with time or place
- Trouble understanding visual images and spatial relationships
- New problems with words in speaking or writing
- Misplacing things and being unable to retrace steps to find them
- Decreased or poor judgment
- Withdrawal from work or social activities
- Changes in mood and personality
How dementia is diagnosed
There is no single test to diagnose dementia. Diagnosis involves a comprehensive evaluation typically including:
- A detailed medical history and physical examination
- Neurological examination
- Cognitive and neuropsychological testing to assess memory, thinking, language, and other functions
- Brain imaging such as MRI or CT scans to identify brain changes and rule out other causes of symptoms such as a brain tumor or stroke
- Blood tests to rule out other conditions that can cause cognitive symptoms such as thyroid disease, vitamin deficiencies, and infections
- In some cases cerebrospinal fluid analysis or specialized PET scans
Early diagnosis is important because it allows the person with dementia to participate in decisions about their care and future planning while they still have the capacity to do so. It also allows access to treatments that may slow progression and time to plan for future care needs.
Treatment of dementia
There is currently no cure for most types of dementia. Treatment focuses on managing symptoms and maintaining quality of life:
- Medications — several medications are approved by the FDA to treat cognitive symptoms of Alzheimer’s disease including cholinesterase inhibitors and memantine. Newer disease-modifying treatments that target amyloid plaques have recently been approved for early Alzheimer’s disease. Medications may also be used to manage behavioral symptoms such as depression, anxiety, and agitation.
- Non-pharmacological approaches — structured routines, cognitive stimulation, physical exercise, music therapy, reminiscence therapy, and social engagement can help maintain function and quality of life
- Caregiver support — supporting family caregivers through education, respite care, and counseling is an essential component of dementia care
- Safety planning — addressing safety concerns such as driving, wandering, and fall prevention is important as dementia progresses
Living with dementia
A diagnosis of dementia does not mean that a person can no longer enjoy life or participate in activities they find meaningful. Many people live well with dementia for years especially in the early stages. Strategies for living well with dementia include:
- Staying physically active
- Maintaining social connections
- Engaging in activities that are meaningful and enjoyable
- Using memory aids and routines to compensate for cognitive changes
- Planning ahead for future care needs while still able to participate in decisions
Planning ahead after a dementia diagnosis
A dementia diagnosis makes advance planning especially urgent because the person’s ability to make legal and financial decisions will decline over time. Important planning steps include:
- Completing a durable power of attorney and healthcare power of attorney while still able to do so
- Creating or updating a will and advance directive
- Discussing wishes regarding future care and end of life preferences with family members
- Consulting with an elder law attorney about long term care planning and Medicaid eligibility
- Reviewing financial accounts and beneficiary designations
Resources for people with dementia and their families
- Alzheimer’s Association — alz.org provides comprehensive information, support groups, and a 24-hour helpline at 1-800-272-3900
- Alzheimer’s Foundation of America — alzfdn.org provides educational resources and support
- National Institute on Aging — nia.nih.gov provides research-based information about dementia
- Lewy Body Dementia Association — lbda.org provides resources specifically for people with Lewy body dementia and their families
- Association for Frontotemporal Degeneration — theaftd.org provides resources for people with frontotemporal dementia
- Eldercare Locator — eldercare.acl.gov connects families with local care and support services
Key terms to know
- Dementia — a general term for a decline in cognitive function severe enough to interfere with daily life
- Alzheimer’s disease — the most common form of dementia
- Vascular dementia — dementia caused by reduced blood flow to the brain
- Lewy body dementia — dementia caused by abnormal protein deposits in the brain
- Frontotemporal dementia — dementia that primarily affects personality behavior and language
- Cognitive function — mental abilities including memory thinking problem solving language and judgment
- Amyloid plaques — abnormal protein deposits associated with Alzheimer’s disease
- Cholinesterase inhibitor — a class of medications used to treat cognitive symptoms of Alzheimer’s disease
Sources
- Alzheimer’s Association — alz.org
- National Institute on Aging — nia.nih.gov
- World Health Organization — who.int
- Centers for Disease Control and Prevention — CDC
This article is for general informational purposes only and does not constitute legal or medical advice. Consult a licensed healthcare provider for guidance specific to your situation.