Understanding Dementia: Differences from Alzheimer’s & Common Behavioural Signs

Occasionally misplacing your keys or momentarily forgetting an appointment is a familiar experience for many people. However, when changes in memory or behaviour begin to affect daily functioning, judgment, or personal safety, they become signs that deserve closer attention.

With an ageing population, dementia has become an increasingly important health topic. Understanding what dementia is, recognising its common symptoms, and knowing how it differs from what is commonly referred to as “senile dementia” are key steps in protecting long-term health.

This article aims to provide clear and practical information to help individuals and families better understand dementia and prepare for future health management.

What Is the Difference Between Dementia and “Senile Dementia”?

In everyday conversations, the terms “dementia” and “senile dementia” are often used interchangeably. From a medical perspective, however, they are not the same.

Dementia is not a single disease, but an umbrella term used to describe a group of symptoms that affect memory, thinking, judgement, and social abilities severely enough to interfere with daily life. What the general public often calls “senile dementia” usually refers to Alzheimer’s disease, which is the most common cause of dementia.

Key Differences Between Dementia and Alzheimer’s Disease
 

Item	Dementia	Alzheimer’s Disease (commonly called senile dementia)
Nature	A group of symptoms	A specific brain disease
Relationship	Includes multiple types	Most common cause of dementia
Symptom onset	Depends on the underlying cause	Memory loss usually appears first

Understanding these distinctions helps individuals and families better interpret medical assessments and plan appropriate care and disease management.

Common Types of Dementia: Causes and Key Characteristics

Dementia can be compared to a condition with symptoms —much like a chronic cough—while doctors focus on identifying the underlying cause responsible for those symptoms. Below is an overview of some of the more common types of dementia:

Type of Dementia	Main Cause	Common Features	Additional Notes
Alzheimer’s Disease	Gradual degeneration of brain cells	Memory loss often appears first, followed by difficulties with language, judgment, and daily activities	Accounts for approximately 60–80% of all dementia cases
Vascular Dementia	Impaired blood flow to the brain (e.g. stroke)	Cognitive changes may occur suddenly	Often progresses in a step‑like pattern and is closely linked to cardiovascular health
Lewy Body Dementia	Abnormal protein deposits (Lewy bodies) in the brain	Cognitive changes accompanied by visual hallucinations and movement difficulties	Symptoms can be complex and wide‑ranging
Frontotemporal Dementia	Degeneration of the frontal or temporal lobes	Early changes in personality and behaviour	Usually occurs at a younger age and may not begin with memory loss

Dementia Is More Than Forgetfulness: Early Signs to Watch For

Many people associate dementia solely with poor memory, but early changes often involve communication, behaviour, and thinking patterns.

• Misplacing items and disorganised daily life
  Individuals may place everyday objects in unusual locations, such as putting clothes in the refrigerator or keys inside shoes, reflecting impaired memory and judgement .
  
  
• Losing orientation in familiar environments
  Even at home, individuals may become disoriented or unable to find their way around, increasing the risk of falls or wandering, which raises safety concerns.
  
  
• Speech interruptions and difficulty expressing thoughts
  Conversations may stop abruptly due to forgotten words, incomplete sentences, or declining writing ability with messy handwriting.
  
  
• Unusual or inappropriate behaviour
  When individuals cannot clearly express basic needs such as hunger or the need to use the bathroom, frustration may lead to shouting, repetitive actions, or inappropriate behaviour in public settings.
  
  
• Emotional changes, hallucinations, or delusions
  Sudden mood swings, anxiety, or depression may occur. Some individuals develop delusions, such as believing items have been stolen or someone is following them, requiring patience and reassurance from caregivers.

If these symptoms persist and begin to interfere with daily life, it is advisable to consult healthcare professionals for further assessment.

Diagnosing Dementia: Preparing for the Future

A Dementia diagnosis does not rely on a single test. Instead, it involves a comprehensive assessment to understand the individual’s overall condition:

• Medical History and Symptom Discussion: Diagnosis begins with a detailed review of the individual’s personal and family medical history. The doctor will also discuss observed behavioral and cognitive changes with the patient and their family members.
  
  
• Cognitive and Neuropsychological Testing: A range of tests will be conducted to assess memory, attention, problem‑solving ability, and language skills, helping to determine the extent of cognitive impairment.
  
  
• Physical Examination, Neurological Assessment, and Laboratory Tests: Physical and neurological examinations help rule out other medical conditions. Blood tests may be used to identify infections, vitamin deficiencies, thyroid dysfunction, or other health issues that could affect cognitive function.
  
  
• Brain Imaging: Imaging techniques such as MRI, CT, or PET scans can help visualize changes in the brain, rule out other causes such as tumors, and support the diagnostic process.
  
  
• Comprehensive Evaluation and Diagnosis: The doctor will integrate all examination results to determine whether dementia is present, identify its type and stage, and develop an appropriate treatment and care plan.

Early assessment helps individuals and families plan daily care, support arrangements, and long-term needs more effectively. Some people may also consider suitable health protection solutions to support medical and long-term care planning.

Certain critical illness insurance plans may include coverage for dementia‑related conditions, such as severe neurodegenerative disorders or Parkinson’s disease. Depending on the policy design, benefits may offer staged protection or long‑term financial support to help ease the financial burden associated with extended care and ongoing medical needs.

The scope of coverage, benefit structure and eligibility criteria vary by individual plan and are subject to the relevant policy terms and conditions.

How Is Dementia Managed?

While dementia cannot currently be cured, appropriate treatment and lifestyle adjustments may help slow cognitive decline and maintain quality of life.

• Pharmacological Treatment: Medications such as cholinesterase inhibitors, NMDA receptor antagonists, or anti‑amyloid therapies can help support brain cell function and alleviate symptoms caused by neurodegeneration.
  
  
• Non‑Pharmacological Treatment: This includes cognitive training, music therapy, physical exercise, and social activities, all of which aim to help the brain form new neural connections.

Dementia is a journey that requires time, understanding, and adaptation. By learning to recognise early signs, monitoring daily changes, and building awareness around health management and support options, individuals and families can face the future with greater confidence and peace of mind.

Taking a proactive step towards understanding dementia is also a step towards protecting health—today and in the years to come.