Dementia is a general term for a decline in cognitive abilities such as memory, thinking, reasoning and problem-solving that becomes significant enough to interfere with everyday life. It is not a normal part of ageing and can have several different causes.
Memory loss is a common symptom, but dementia can also affect language, judgment, behaviour, attention, orientation and the ability to perform familiar daily activities.
Early and accurate evaluation can help identify the possible cause of cognitive changes, rule out potentially treatable conditions and guide appropriate management.
Dementia refers to a decline in cognitive functioning that interferes with a person’s ability to perform everyday activities.
It can affect several areas of brain function, including:
Dementia is an umbrella term rather than a single disease. Alzheimer’s disease is the most commonly diagnosed form of dementia, but several other neurological conditions can cause dementia.
The symptoms, progression and treatment approach vary depending on the underlying cause.
Dementia symptoms can develop gradually and may initially be subtle.
Common signs include:
Not every memory problem means dementia. Occasional forgetfulness can occur with normal ageing, but persistent or worsening cognitive changes that interfere with daily life should be evaluated.
Alzheimer’s disease is the most common form of dementia.
It commonly begins with memory problems and may gradually affect thinking, language, judgment and the ability to perform everyday activities. (nia.nih.gov)
Vascular dementia is associated with problems involving blood vessels and blood flow in the brain.
It may occur after a stroke or as a result of damage to small blood vessels in the brain.
Lewy body dementia can involve cognitive changes along with symptoms such as fluctuations in alertness, visual hallucinations, sleep disturbances and movement problems.
Frontotemporal dementia affects areas of the brain associated with behaviour, personality, language and executive functions.
It can sometimes begin at a younger age compared with other forms of dementia.
Some people have more than one type of brain disease contributing to cognitive decline. This is known as mixed dementia.
No.
Memory problems can occur for several reasons, including normal ageing, medication effects, sleep problems, depression, nutritional deficiencies and other medical or neurological conditions.
Some causes of cognitive problems may be treatable. Therefore, a medical evaluation is important before assuming that memory loss is caused by dementia.
A neurological evaluation may be appropriate when someone experiences:
Early assessment can help identify the cause and support appropriate planning and management.
There is no single test that diagnoses every type of dementia.
Diagnosis usually involves a combination of medical history, cognitive assessment, neurological examination and selected investigations. (nia.nih.gov)
The doctor may discuss:
A family member or caregiver may also provide useful information about changes that the patient may not notice themselves.
Cognitive testing may assess:
Validated cognitive screening tools may be used as part of the assessment. (nice.org.uk)
The examination may assess:
Blood tests may help identify potentially reversible or contributing conditions such as nutritional, metabolic or endocrine problems.
Brain imaging may help identify:
Not every patient requires every investigation.
Treatment depends on the type of dementia, underlying cause, symptoms and stage of the condition.
Management may include:
Some forms of dementia have specific treatment options, while in other forms treatment focuses mainly on symptom management and maintaining function.
Certain medicines may be prescribed for selected patients depending on the type and stage of dementia.
For Alzheimer’s disease, medicines such as donepezil, galantamine and rivastigmine may be used for appropriate patients, while memantine may be considered in certain stages or circumstances. (nice.org.uk)
Medication selection depends on:
Medication should only be started, stopped or changed under appropriate medical supervision.
Some people with dementia may develop:
Management depends on the cause and severity of symptoms.
Non-medication approaches, including maintaining a familiar environment, identifying triggers and providing appropriate support, may be considered before certain medicines.
Supportive care can help people living with dementia maintain function and quality of life.
It may include:
These measures do not replace medical treatment but can form an important part of long-term care.
Dementia affects both the person experiencing cognitive decline and their family or caregivers.
Caregivers may need support with:
As dementia progresses, the level of support required may change. Planning ahead can help families prepare for future care and safety needs.
Depending on the patient’s symptoms, safety planning may include:
Safety requirements should be individualized according to the person’s cognitive and physical abilities.
Memory, thinking, behaviour and changes in daily functioning are discussed.
Cognitive abilities and neurological function are evaluated.
Blood tests, brain imaging or other investigations may be recommended when required.
The findings are reviewed to determine the most likely cause or type of cognitive impairment.
A personalized management plan is developed based on the diagnosis and individual needs.
Ongoing assessment helps monitor cognitive changes, treatment response and changing care requirements.
Not all forms of dementia can be prevented, but managing certain health and lifestyle factors may help reduce dementia risk.
Important measures include:
A healthy lifestyle also supports overall cardiovascular and brain health.
The cost of dementia evaluation and treatment depends on the patient’s symptoms, diagnostic requirements and ongoing care needs.
Factors may include:
An accurate estimate can be provided according to the individual’s evaluation and treatment requirements.
Dementia is a decline in cognitive abilities such as memory, thinking and reasoning that interferes with everyday life. It is not a normal part of ageing. (nia.nih.gov
No. Dementia is an umbrella term describing significant cognitive decline that affects daily life. Alzheimer’s disease is the most common cause of dementia. (nia.nih.gov)
Occasional forgetfulness can occur with normal ageing. However, persistent memory problems that interfere with daily activities should be medically evaluated. (nia.nih.gov
Diagnosis may involve medical history, cognitive testing, neurological examination, blood tests and brain imaging such as MRI or CT when appropriate.
There is currently no universal cure for dementia. Treatment depends on the underlying cause and may help manage symptoms, maintain function or address specific conditions contributing to cognitive decline.
Yes. Depending on the type and symptoms, treatment may include medication, management of other health conditions, behavioural strategies and supportive care.
A neurological evaluation is advisable when memory or thinking problems are persistent, progressively worsening or beginning to interfere with everyday activities.
Many progressive dementias worsen over time, but the rate and pattern of progression vary considerably depending on the underlying condition.
