Yes, brain scans (like MRI, CT, PET) can show signs of dementia, such as brain shrinkage (atrophy) or patterns of reduced brain activity, but they don't provide a definitive diagnosis on their own; they help rule out other causes (strokes, tumors) and support a clinical diagnosis by revealing structural damage or abnormal protein buildup (amyloid/tau) linked to different dementia types.
Brain scans are often used for diagnosing dementia once the simpler tests have ruled out other problems. Like memory tests, on their own brain scans cannot diagnose dementia, but are used as part of the wider assessment.
Symptoms of dementia
In contrast to Alzheimer's, early symptoms of vascular cognitive impairment tend to affect the speed of thinking and problem-solving rather than memory loss. There aren't specific stages of vascular cognitive impairment or vascular dementia, but the condition does tend to progress and get worse over time.
Although the early signs vary, common early symptoms of dementia include:
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.
Common changes in behaviour
The most common symptoms of vascular dementia during the early stages are:
Life expectancy with dementia varies greatly but averages a few years to over a decade, often 4 to 8 years for Alzheimer's, depending heavily on age at diagnosis (younger means longer), type (Alzheimer's generally longer than Vascular), and other health conditions, with newer research showing averages like 5.1 years for women and 4.3 for men from diagnosis, but with wide ranges from shorter for older adults to longer for some.
Smoking, low physical activity, and a poor diet are all lifestyle and environmental influences that have been linked to rapid dementia decline. Physical activity promotes cardiovascular health, which in turn improves brain function. Those who lead a sedentary lifestyle may experience faster cognitive decline.
Our results confirm that vitamin D deficiency is associated with a substantially increased risk of all-cause dementia and Alzheimer disease.
In stage 1 of the Global Deterioration Scale, or GDS, the person isn't experiencing any symptoms. There's no cognitive decline, and although they may have occasional memory lapses, forgetfulness has no impact on their function.
Physicians use diagnostic tools combined with medical history and other information, including neurological exams, cognitive and functional assessments, brain imaging (MRI, CT, PET) and cerebrospinal fluid or blood tests to make an accurate diagnosis.
Each year, thousands of people are misdiagnosed with dementia. “Delirium (officially called acute toxic metabolic encephalopathy) can mimic many of the same symptoms as a dementia.
There is no known cure, but early diagnosis and treatment can lead to better quality of life. Stay healthy with a good diet and regular exercise. Stay away from alcohol and other substances that may affect memory, thinking, and behavior.
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.
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.
There's no certain way to prevent all types of dementia, as researchers are still investigating how the condition develops. However, there's good evidence that a healthy lifestyle can help reduce your risk of developing dementia when you're older.
Memory problems
Difficulties with memory are the most well-known first signs of dementia. For example, a person may not recall recent events or may keep losing items (such as keys and glasses) around the house. Memory loss is often the first and main symptom in early Alzheimer's disease.
Many people affected by dementia are concerned that they may inherit or pass on dementia. The majority of dementia is not inherited by children and grandchildren. In rarer types of dementia there may be a strong genetic link, but these are only a tiny proportion of overall cases of dementia.
Rapidly progressive dementias (RPDs) are dementias that progress quickly, typically over the course of weeks to months, but sometimes up to two to three years. RPDs are rare and often difficult to diagnose. Early and accurate diagnosis is very important because many causes of RPDs can be treated.
Breaking the habit of sedentary behavior is a powerful step toward reducing dementia risk. Pairing this with other lifestyle modifications—such as exercise, a healthy diet, quality sleep, and social engagement—creates a comprehensive approach to brain health.
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Donepezil (also known as Aricept), rivastigmine (Exelon) and galantamine (Reminyl) are used to treat the symptoms of mild to moderate Alzheimer's disease. Donepezil is also used to treat more severe Alzheimer's disease.