While there's no direct cause-and-effect, research suggests a link, with some studies showing narcissistic traits, particularly vulnerable narcissism, may increase Alzheimer's risk, and dementia can significantly worsen narcissistic behaviors like entitlement and manipulation, creating challenging dynamics as individuals struggle with cognitive decline, leading to heightened irritability, denial, and difficulty accepting dependence. The combination makes symptoms harder to distinguish, as cognitive impairment amplifies existing personality issues, demanding specific caregiving strategies.
A recent meta-analysis revealed that higher neuroticism and lower conscientiousness are consistent predictors of higher dementia risk, across dementia types, including Alzheimer's disease (AD), dementia assessment methods, follow-up lengths, and countries (Aschwanden et al., 2021).
The number one cause of dementia is Alzheimer's disease, responsible for 60-80% of cases, characterized by brain plaques (beta-amyloid protein) and tangles (tau protein) that damage nerve cells, leading to progressive memory and cognitive decline, though vascular dementia from blood vessel damage is also a significant factor.
It's not known what causes narcissistic personality disorder. The cause is likely complex. Narcissistic personality disorder may be linked to: Environment — parent-child relationships with either too much adoration or too much criticism that don't match the child's actual experiences and achievements.
A person living with NPD and dementia may become more irritable, demanding, and even manipulative as their cognitive functions decline.
The "2-finger test" for dementia involves an examiner showing a hand gesture (like interlocking index and middle fingers) and asking the patient to copy it, testing motor skills, visual memory, and coordination, as difficulties can signal early cognitive decline, but it's a screening tool, not a definitive diagnosis, prompting further medical evaluation. Other related tests include finger-tapping and finger-to-nose, looking for hesitation or misjudgment in movement.
Research suggests that certain narcissistic traits, such as grandiosity and entitlement, may naturally decline with age as people gain life experience and face challenges that encourage personal growth. However, this isn't always the case.
The number one trait of a narcissist is often considered a grandiose sense of self-importance (grandiosity) combined with a profound lack of empathy, where they see others as tools for their own gain and have an inflated, often unrealistic, view of their own superiority, needing constant admiration without acknowledging others' feelings or needs, as highlighted by HelpGuide.org and The Hart Centre. This core creates other behaviors like entitlement, manipulation, and arrogance, making them believe they deserve special treatment.
Traditionally, childrearing, particularly by the mother, was considered the cause of narcissism. In recent years, more research and twin studies have also looked at genetic factors. When you grow up with a narcissistic parent, you can get a double dose of hereditary and environmental factors.
Five key signs of a narcissist include a grandiose sense of self-importance, an excessive need for admiration, a strong sense of entitlement, lack of empathy for others' feelings, and a tendency to exploit or manipulate people for personal gain, all stemming from a fragile ego and deep insecurity. They often boast, feel unique, get easily slighted by criticism, and disregard others' needs.
The cause of roughly 70% of all dementia cases is Alzheimer's disease, a progressive brain disorder characterized by the buildup of amyloid plaques and tau tangles, leading to memory loss and impaired thinking that interferes with daily life, making it the most common form of dementia.
Seroquel is the brand name for quetiapine, an atypical antipsychotic that is used off-label to treat severe behavioral signs of dementia. It can help with bad symptoms, including agitation, aggressiveness, and hallucinations, that other drugs don't help with.
But Romano says it's a leap to say that skipping breakfast actually causes dementia. “Alzheimer's disease is a complex brain illness,” he says. “Although the study found these correlations between skipping breakfast and dementia, skipping breakfast might be an indicator of other health habits or life circumstances.”
The 10 warning signs of dementia include memory loss, difficulty with familiar tasks, confusion about time/place, trouble with language, poor judgment, misplacing things, personality changes, loss of initiative, and problems with visual/spatial skills, requiring professional assessment to distinguish from normal aging.
Common changes in behaviour
Age. The biggest risk factor for dementia is ageing. This means as a person gets older, their risk of developing dementia increases a lot. For people aged between 65 and 69, around 2 in every 100 people have dementia.
Narcissistic traits often peak in late adolescence and early adulthood (around ages 14-23), particularly with grandiosity and entitlement, as individuals seek identity and status, but then tend to decline as people mature and face life's realities, though some individuals with NPD may see intensification in these years before a potential mellowing in middle age.
I understand: Saying “I understand” is a simple yet effective way to acknowledge the feelings of someone with narcissistic tendencies. It's compelling because you can use it without agreeing or disagreeing with them. This shows you have empathy while still allowing you to maintain self-preserving boundaries.
Five core traits of a narcissist include a grandiose sense of self-importance, an excessive need for admiration, a strong sense of entitlement, lack of empathy, and a tendency for interpersonally exploitative behavior, meaning they use others for personal gain. These traits often manifest as arrogance, fantasies of unlimited success, and envy, making relationships challenging.
12 signs of narcissism
Based on some overlapping symptoms, borderline personality disorder (BPD) and narcissistic personality disorder (NPD) are two mental health disorders that are often mistaken for one another.
The 10 Most Narcissistic U.S. Presidents
As a Harvard-trained psychologist, I've found that there are seven phrases you'll hear from highly narcissistic people:
For example, someone with narcissism and dementia may: become more demanding and critical, unable to recognize their cognitive decline. respond with anger or denial when faced with their limitations. display intensified manipulative behaviors due to impaired judgment and decreased inhibition.
Adaptive narcissism is when a person with this disorder leans into positive traits—such as self-sufficiency and confidence—that can actually be healthy. They may help someone set high ambitions at work, for example, or enjoy satisfying relationships without being overdependent on a partner.