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When Your Brain Starts to Feel Different A plain-language guide to understanding neurocognitive disorders |
Something Feels Off
Maybe you’ve been walking into rooms and forgetting why you went in. Or reaching for a word that should come easily and finding it just… isn’t there. Maybe you’ve missed appointments you were sure you’d remember, or found yourself reading the same paragraph three times and still not taking it in.
Most of us chalk these moments up to stress, poor sleep, or just getting older. And often, that’s exactly what they are. But sometimes, something more is going on and the uncertainty of not knowing can be just as unsettling as the symptoms themselves.
If you or someone you care about has been noticing changes in thinking, memory, language, or the ability to manage daily tasks, this guide is written for you. Not to alarm you but to give you clear, honest information so you can make sense of what’s happening and take the right steps forward.
What Is a Neurocognitive Disorder?
A neurocognitive disorder (NCD) is an umbrella term used to describe a significant decline in one or more areas of cognitive functioning, things like memory, attention, language, problem-solving, or the ability to navigate and complete everyday tasks. Crucially, this decline represents a change from how a person previously functioned. It’s not about where you started; it’s about the shift or the decline.
The term was introduced in the DSM-5 (the diagnostic manual used by psychologists and psychiatrists, medical professionals) to more precisely capture a broad range of conditions that had previously been grouped loosely under the word “dementia.” While dementia is one possible outcome within this category, neurocognitive disorders span a much wider spectrum.
What neurocognitive disorders have in common is this: the cognitive changes are acquired, meaning they weren’t always there, and they reflect something happening in the brain, rather than being a symptom of a mood disorder or psychotic condition.
Normal Ageing vs. Something Worth Investigating
This is one of the questions we hear most often, and it’s a genuinely important one. Some degree of cognitive change is a normal part of ageing. Processing speed slows a little. It can take longer to recall names or learn new technology. Multitasking becomes more effortful. These changes are real, but they don’t significantly interfere with a person’s ability to live independently or function in their daily life.
A neurocognitive disorder is something different. The changes are more noticeable, more consistent, and more disruptive. They tend to affect multiple areas of life rather than just the occasional forgotten name. And they represent a meaningful decline from the person’s own previous baseline, not just a comparison to others their age.
Some signs worth paying attention to include:
- Getting lost in familiar places or losing track of dates, seasons, or how much time has passed
- Difficulty following a conversation, keeping track of a story, or finding words that were once easy
- Making unusual errors in judgment, like financial decisions that seem out of character
- Struggling to manage tasks that used to be routine, cooking a familiar meal, paying bills, and managing medication
- Personality or mood changes that feel unfamiliar, such as increased irritability, apathy, anxiety, or social withdrawal
- Repeating the same questions or stories within a short period of time without realising it
One or two of these experiences on their own, occasionally, might not be cause for alarm. A pattern of them, or a noticeable change over months, is worth taking seriously.
| The question to ask isn’t “am I forgetting things?” everyone does. The question is: has something meaningfully changed from how I used to be? |
Mild vs. Major Neurocognitive Disorder
One of the most helpful things to understand about neurocognitive disorders is they can be classified as mild or major. A diagnosis doesn’t automatically mean the worst-case scenario and catching something early opens up significantly more options.
Mild Neurocognitive Disorder
Mild NCD (sometimes referred to as mild cognitive impairment, or MCI) sits in the middle ground between normal ageing and major neurocognitive disorder. The person is noticeably experiencing cognitive changes they may be struggling to keep track of complex information, feeling slower to process things, or needing more effort to do things that used to be automatic.
But crucially, they are still functioning independently. They can manage their daily life, their relationships, their finances. The challenges are real, but they haven’t yet crossed the threshold of significant impairment.
Mild NCD is an important diagnosis to catch, because for some people it remains stable or even improves particularly when underlying causes like medication side effects, vitamin deficiencies, sleep disorders, or depression are identified and addressed. For others, it may progress over time, which is why monitoring and early intervention matter.
It’s also worth noting that concussion can be classified as a mild neurocognitive disorder. Following a concussion, it’s common to experience difficulties with memory, concentration, processing speed, and mental fatigue. The encouraging news is that for most people these symptoms do improve significantly with time, rest, and appropriate management. If you’ve had a concussion and are concerned about ongoing cognitive changes, an assessment can help clarify where things stand and guide your recovery.
Major Neurocognitive Disorder
Major NCD represents a more significant cognitive decline one that does meaningfully affect a person’s ability to live independently and manage daily activities. This is the territory that was previously referred to as dementia. Tasks that once required no effort now require help.
Memory gaps become more pronounced. Disorientation, communication difficulties, and changes in behaviour and personality become more prominent.
A major NCD diagnosis is a significant moment for both the individual and their family. It doesn’t mean everything changes overnight many people with a major NCD continue to live rich, meaningful lives for years with appropriate support. But it does mean that planning, support systems, and care conversations need to begin.
What Causes a Neurocognitive Disorder?
This is where things get more complex and more nuanced. Neurocognitive disorders are not a single disease. They’re a category that encompasses many different underlying conditions, each with its own trajectory, characteristics, and implications for treatment.
Alzheimer’s Disease
Alzheimer’s is the most common cause of neurocognitive disorder, accounting for the majority of major NCD diagnoses. It’s a progressive neurodegenerative condition characterised by the accumulation of protein plaques and tangles in the brain, which gradually disrupt how neurons communicate. Memory particularly the ability to form and retain new memories is usually the earliest and most prominent symptom. Alzheimer’s typically progresses slowly over years.
Vascular Neurocognitive Disorder
This type is caused by reduced or interrupted blood flow to the brain, often as a result of strokes or a series of smaller “silent” strokes. Unlike Alzheimer’s, which tends to progress gradually, vascular NCD can appear more suddenly and may have a stepwise pattern where a person seems stable and then declines noticeably after another vascular event. Managing cardiovascular risk factors like blood pressure, cholesterol, and diabetes is central to reducing further decline.
Lewy Body Disease
Dementia with Lewy bodies involves abnormal protein deposits (called Lewy bodies) forming in the brain. It often comes with a distinctive combination of cognitive fluctuations, visual hallucinations, and movement symptoms similar to Parkinson’s. People with Lewy body dementia may have days where they seem relatively clear, and others where they’re quite confused a fluctuation that can be confusing for families who wonder if their loved one is “putting it on.” They are not.
Frontotemporal Degeneration
This is a less common but often misunderstood form of NCD that affects the frontal and temporal lobes of the brain. Rather than memory being the first thing to change, people with frontotemporal degeneration often experience significant shifts in personality and behaviour first becoming disinhibited, impulsive, or oddly apathetic. Language can also be affected early. It can onset as early as a person’s 40s or 50s, which makes it particularly distressing when it’s initially mistaken for a mental health condition or midlife crisis.
Traumatic Brain Injury
A significant blow to the head from an accident, a fall, or repeated impacts in contact sports can cause lasting changes to cognitive function. Depending on the severity and location of the injury, this might show up as memory difficulties, slowed processing, problems with impulse control, or changes in personality and emotional regulation. Cognitive changes following a traumatic brain injury are real and legitimate, even when they’re not immediately visible.
Other Causes
Neurocognitive disorders can also result from Parkinson’s disease, Huntington’s disease, HIV-related brain changes, prion diseases, chronic alcohol use, or certain medications. Some ofthese causes are reversible with appropriate treatment which is one very important reason to get a thorough assessment rather than assuming the worst.
You Are Not Just Your Diagnosis
If you’re reading this because you or someone you love has recently been through a diagnostic process, or is in the middle of one, we want to say something clearly: a neurocognitive disorder diagnosis does not define a person. It explains some of what’s happening. It points toward appropriate support. It opens conversations that need to be had.
But the person is still there with their history, their relationships, their preferences, their humour, their capacity for connection. A diagnosis is the beginning of a new chapter, not the end of the story.
| “Understanding what is happening in the brain is the first step toward getting the right support for yourself, and for the people who love you.” |
Final Thoughts
If you’ve noticed changes in memory, thinking, or daily functioning, gaining clarity early can make a meaningful difference. A neurocognitive assessment helps identify what’s happening and what support may be needed.
Book an appointment with one of our psychologists to discuss assessment options and whether our services are suitable for you or someone you care about.
