Dementia: Symptoms, Causes, Types, Treatment & Prevention

 

The term "dementia" for a group of symptoms that impair cognitive functioning, which includes thinking, memory, emotion, and behavior. Your everyday activities and life are disrupted by the decrease. People over 65 are typically affected. Medications may help slow the onset of symptoms. Your life expectancy may be shortened by dementia.

What Is Dementia?

Dementia is indicated by a deterioration in the mental skills required for day-to-day functioning. It results from damage to the brain regions involved with language, learning, memory, and decision-making.

It's not a specific disease. It provides a clinical description of a collection of symptoms caused by underlying brain diseases. The most common cause is Alzheimer's disease.

You might not be able to remember the name of a close friend or loved one if you have it. Alternatively, you could become lost in your familiar area.

It is not a natural aspect of aging. Additionally, it may lower your life expectancy, albeit the varying degree.

Also Read: Brain diseases: Types, Causes, Symptoms, Diagnosis, Treatment & Prevention

Dementia types:

Three types exist. They vary according to the reason:

• Primary: A brain condition is the main cause of dementia. There are no other causes. Examples include frontotemporal dementia, vascular dementia, Lewy body dementia, Alzheimer's disease, and mixed dementia (two or more types together).

• Secondary: This type is caused by another medical condition that modifies your body. Brain dysfunction is the secondary impact. Two examples include alcohol-related problems and infections.

• Reversible: It may be possible to treat some secondary causes of dementia, such as vitamin deficiencies or negative drug reactions.

 Symptoms:

Typical dementia symptoms that interfere with daily operation
Your ability to think clearly and do daily tasks is affected by dementia.

The type and place of the most damaged part of your brain can affect the symptoms.

Symptoms of cognition:

Changes in your comprehension and way of thinking are known as cognitive symptoms. These could consist of:

Sharing thoughts can be difficult if you're having problems expressing what you want to say.

• Memory loss: Forgetting names, recent learnings, or prior events

• Issues complying with instructions: Not knowing or recalling the steps

• Language difficulties: Having trouble understanding, writing, or reading words

Psychological and behavioral signs :

These are shifts in your emotions or interpersonal relationships. They may have an impact on your personality, hobbies, and mood. These could consist of:

• Agitation: Having a restless or angry feeling

• Anxiety: A state of unease or concern

• Depression: Feeling depressed or losing interest

• Not knowing where you are or what time it is might cause disorientation.

• Feeling angry or frustrated by things that were formerly simple is known as irritability.

• Hearing or seeing things that aren't actually there is known as hallucination.

• Thinking that people are attempting to harm or deceive you is known as paranoia.

• Repeated motions or fidgeting: tapping of the fingers or pacing

• Sleep issues include sleeping throughout the day or waking up frequently at night.

Stages of dementia:

Based on the way symptoms worsen over time, doctors may categorize dementia into phases. The three primary phases are:

• Mild early-stage dementia

• Moderate middle-stage dementia

• Severe late-stage dementia

Early on, it has a minor impact on your daily life. You can still perform the majority of self-care activities at home, such as getting dressed, taking a shower, and preparing basic meals, even though you might experience some memory or cognitive issues.

Thinking and everyday chores get more difficult in the middle stage. To finish them, you might require prompts or reminders.

You may need full-time care in the later stages and need daily assistance. You require assistance with everyday tasks like eating, taking a shower, and getting dressed, and most of your cognitive abilities have been lost.

Causes of dementia:

Dementia is caused by damaged brain cells. The majority of the time, this damage is caused by a neurodegenerative disease, which gradually damages brain cells. The areas of your brain that regulate memory, learning, language, and decision-making are impacted by these alterations.

Electrical signals must be sent between brain cells in order for them to "talk." These signals facilitate brain function. Your brain cannot function correctly when there is a blockage in the messages or damage to the cells.

The reasons why some people develop dementia, and others do not, are still being investigated by researchers. Rarely, it may be brought on by a change in the gene

Causes of secondary dementia

Secondary dementia is frequently caused by the following illnesses and conditions:

• Alcohol-related

• Disease of Creutzfeldt-Jakob

• Encephalitis

• Meningitis

• Multiple sclerosis

• Brain damage caused by trauma

• Wilson disease

Causes of reversible dementia

Once your physician resolves the underlying cause of your reversible dementia symptoms, they may disappear. Typical causes include the following:

• Brain hemorrhage (subdural hematomas)

• Brain tumors

• Diseases affecting other body organs (renal failure, liver cirrhosis)

• Your brain is filled with fluid (normal pressure hydrocephalus)

• Thyroid issues, Cushing's disease, and Addison's disease are examples of hormone-related conditions

• Infections (such as syphilis and HIV)

• Adverse reactions to medication (from specific medications, such as benzodiazepines or anticholinergics)

• Deficits in certain vitamins (such as vitamin B1, vitamin B6, vitamin B12, copper, or vitamin E)

Risk factors:

Your risk of dementia may be increased by specific variables. These consist of:

• Age: Growing older is the largest risk, but it cannot be avoided. The majority of diagnoses occur after age 65.

• Family history: You may be at a higher risk of developing it if a biological parent or sibling already has it.

• Down syndrome: This disorder makes you more likely to experience symptoms, particularly when you're younger.

• Heart and blood vessel issues: Smoking, diabetes, high blood pressure, and high cholesterol can all harm blood vessels. Strokes and poor blood flow could increase your risk.

• Race and ethnicity: Compared to white individuals, Black adults have a roughly 1.5-fold higher risk of developing dementia, and Hispanic persons have a roughly 2-fold higher risk.

• Serious brain injury: You run a higher risk if you have experienced a major head injury and have lost consciousness over your life.

Complications:

Everything your body performs is controlled by your brain. When it stops working, it may have an impact on your general health. Serious issues can result from dementia, such as:

• Bedsores

• Poor nutrition and dehydration

• Having trouble controlling your feces or urine

• Broken bones, injuries, or falls

• A case of pneumonia

• Sepsis

If not addressed right once, several of these issues may become fatal. Untreated symptoms could cause early death.

Testing and Diagnosis:

How physicians identify dementia

A healthcare professional will determine whether you have dementia by:

• Inquire about the onset and frequency of your symptoms.

• Examine your medical history, both personal and familial.

• Examine the medications you are now taking.

Tests of order

Dementia diagnosis may take some time. This is due to the fact that many different conditions might present with the same symptoms. It might be necessary for your care team to rule out other issues first. They will assist you in managing your symptoms while they seek the correct diagnosis.

Dementia tests

To confirm a diagnosis, your provider may employ one or more of the tests listed below:

• Blood testing

• A CT scan

• MRI

• Examining the mental status

• A PET scan

• Neuropsychiatric evaluation

• Spinal taps (lumbar punctures)

Treatment:

Is there a cure for dementia?

Right present, there is no remedy. Researchers are attempting to better comprehend it. However, many varieties of dementia are treatable.

How is dementia treated?

There is no medication that can totally prevent dementia from worsening. However, your doctor can help you manage your symptoms and lessen their impact on your daily life.

Treatment may change for each individual because dementia affects everyone differently. What works for one individual may not work for another. Some treatments may become less effective as the condition advances.

Dementia medications

Medicines are typically the first type of treatment for most forms of dementia. Common choices include:

• Cholinesterase inhibitors (donepezil, rivastigmine, and galantamine) improve memory by altering the chemical balance in the brain.

• Memantine, an NMDA receptor antagonist, modulates brain activity. It may improve memory and make daily duties more manageable.

• Anti-amyloid medicines (lecanemab, donanemab): These drugs may aid in the early stages of Alzheimer's disease. They reduce disease progression and are helpful at removing amyloid plaques from the brain.

• Antidepressants and antipsychotics: These medications can help with mood and behavior changes, anxiety, and other symptoms.

• Before you begin therapy, your provider will explain which medication is appropriate for you and what side effects to expect.

Non-medication-based dementia treatment:

Treatment may include extra methods to support and improve your brain function, such as:

• Managing any health disorders affecting your brain, such as diabetes and blood pressure

• Balance your vitamin, calcium, thyroid, or blood sugar levels

• Changing your medication's kind or dosage

• Having surgery to remove a tumor or relieve pressure in your brain

• Medication-based treatment for infections

• Eating heart-healthy meals

• Participating in frequent physical activity

• Becoming socially engaged

• Having interests that challenge your thinking skills

Prevention:

You cannot prevent all sorts. However, there are ways to reduce your risk for certain types. A healthcare provider can assist you in maintaining your health and cognitive abilities. They might suggest:

• Quit smoking.

• Eat nutritious meals that include a variety of fruits, veggies, and whole grains.

• Exercise for at least 30 minutes most days of the week.

• Engage your intellect with puzzles, word games, reading, or new activities.

• Stay social by communicating with friends and family to improve your mental and emotional wellness.

• Get your hearing and eyesight evaluated and treated to reduce the risk of cognitive impairment.

• Diabetes, high blood pressure, and cholesterol are all risk factors that need to be taken care of properly.

References:

• National Institute of Neurological Disorders & Stroke (U.S.). Dementias (https://www.ninds.nih.gov/health-information/disorders/dementias). Last reviewed 8/27/2024. Accessed 12/5/2025.

• Centers for Disease Control and Prevention (U.S.). About Dementia (https://www.cdc.gov/alzheimers-dementia/about/index.html). Last reviewed 8/17/2024. Accessed 12/5/2025.

• National Health Service (U.K.). What is dementia? (https://www.nhs.uk/conditions/dementia/about-dementia/what-is-dementia/) Last reviewed 7/20/2023. Accessed 12/5/2025.

• National Institute on Aging (U.S.). What is Dementia? Symptoms, Types, and Diagnosis (https://www.nia.nih.gov/health/alzheimers-and-dementia/what-dementia-symptoms-types-and-diagnosis). Last reviewed 12/8/2022. Accessed 12/5/2025.

• Alzheimer’s Association (U.S.). What is Dementia? (https://www.alz.org/alzheimers-dementia/what-is-dementia) Last reviewed 10/22/2019. Accessed 12/5/2025.

• Emmady PD, Schoo C, Tadi P. Major Neurocognitive Disorder (Dementia) (https://www.ncbi.nlm.nih.gov/books/NBK557444/). 2022 Nov 19. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Accessed 12/8/2025.