World Alzheimer’s Day 2026: Memory Loss & Diagnostic Tests

World Alzheimer’s Day 2026, observed on September 21, raises awareness about Alzheimer’s disease and other forms of dementia. It is also a reminder to recognise the difference between normal age related forgetfulness and memory changes that may need medical attention. Memory loss can have several causes, including thyroid problems, vitamin deficiencies, certain medicines, depression and sleep disorders. Recognising persistent changes and understanding when to seek medical advice and what diagnostic tests may be used can support earlier identification and appropriate care.

What Is Alzheimer’s Disease?

Alzheimer’s disease is a progressive brain disorder that affects memory, thinking and behaviour. As the disease progresses, a person may find it increasingly difficult to manage everyday activities independently. Alzheimer’s is the most common form of dementia. According to the World Health Organization, dementia affected more than 55 million people worldwide in 2021, with nearly 10 million new cases occurring each year. Dementia is not a normal part of ageing, although age is an important risk factor. Alzheimer’s disease develops gradually, so early changes may sometimes be difficult to recognise.

What Are the Early Signs of Alzheimer’s?

Occasionally forgetting a name, misplacing an object or needing a reminder does not necessarily indicate Alzheimer’s disease. More concerning changes are usually persistent and begin to interfere with everyday life. Some early signs can include:

Frequently forgetting recently learned information
Asking the same questions repeatedly
Having difficulty completing familiar tasks
Struggling to find common words during conversations
Getting confused about dates, places or directions
Difficulty planning or solving familiar problems
Misplacing items and being unable to retrace previous steps
Noticeable changes in mood, personality or social behaviour

When these changes become frequent or progressively worse, speaking with a healthcare professional is advisable.

How Is Alzheimer’s Disease Diagnosed?

Alzheimer’s diagnosis involves a combination of medical history, symptoms, cognitive assessment and physical examination. Depending on the individual, doctors may also recommend blood tests, brain imaging or specialised investigations. The doctor may ask the individual about changes in memory, thinking and daily activities. A family member or caregiver may also provide useful information about changes they have noticed. Testing is used not only to assess the possibility of Alzheimer’s disease but also to identify or rule out other conditions that can cause similar cognitive symptoms.

What Tests Are Used to Diagnose Alzheimer’s?

There is no single test that can diagnose Alzheimer’s disease. Doctors select investigations based on the person’s symptoms, medical history and overall health.

Cognitive and Memory Tests

Cognitive assessments evaluate memory, attention, language, concentration, reasoning and problem-solving. They can identify changes in thinking and memory, but the results are interpreted alongside symptoms and medical history rather than used alone to diagnose Alzheimer’s.

Blood Tests for Memory Loss

Blood tests can help identify conditions that may cause or worsen memory problems, such as thyroid disorders or vitamin deficiencies. Newer blood-based biomarkers can also detect biological markers associated with Alzheimer’s disease, but these tests are not appropriate for everyone and should be recommended by a healthcare professional.

MRI Scan for Alzheimer’s Assessment

An MRI Scan provides detailed images of the brain and can help doctors identify structural changes or other conditions that may cause cognitive symptoms. It does not independently confirm Alzheimer’s disease.

CT Scan for Dementia Evaluation

A CT scan can identify certain structural abnormalities, previous strokes and other brain changes that may contribute to cognitive symptoms. The choice between CT and MRI depends on the individual’s symptoms and clinical assessment.

PET Scans and Other Specialised Tests

In selected cases, doctors may recommend PET scans or cerebrospinal fluid testing to look for biological changes associated with Alzheimer’s disease, including amyloid or tau. These tests are generally considered when additional information is needed to clarify the diagnosis.

When Should You Get Memory Loss Evaluated?

Memory changes should be discussed with a doctor when they are persistent, progressively worsening or beginning to interfere with everyday activities. It is particularly important to seek medical advice if someone is repeatedly forgetting important information, becoming confused in familiar places, struggling with routine tasks or experiencing noticeable changes in behaviour. Early evaluation can help identify potentially reversible causes of cognitive symptoms and, when Alzheimer’s or another form of dementia is diagnosed, allow individuals and families to understand the condition and plan appropriate care.

Is Memory Loss Always a Sign of Alzheimer’s?

No. Memory loss can occur for many reasons and some causes may be treatable. Poor sleep, stress, depression, certain medications, nutritional deficiencies, thyroid problems and other medical conditions can affect concentration and memory. Normal ageing can also involve occasional changes in recall without causing significant problems with daily functioning. This is why it is important not to diagnose Alzheimer’s based on one symptom or an online checklist. A proper medical assessment provides a clearer picture.

World Alzheimer’s Day 2026: Know When to Seek Help

World Alzheimer’s Day 2026 provides an opportunity to look beyond awareness and understand the importance of recognising persistent memory changes. Alzheimer’s diagnosis involves more than one test and the appropriate evaluation may include cognitive assessments, blood tests, brain imaging or specialised investigations depending on the individual. If you or a family member has noticed ongoing changes in memory or thinking, consult a healthcare professional rather than assuming these changes are a normal part of ageing. If your doctor recommends laboratory investigations as part of your health assessment, Medall Diagnostics provides a range of diagnostic testing services. You can visit your nearest Medall Diagnostics centre for the tests recommended by your healthcare professional.

Frequently Asked Questions

1. What are the early signs of Alzheimer’s disease?

Early signs may include persistent memory loss, repeated questions, difficulty with familiar tasks, confusion about time or place and trouble finding words.

2. What tests are used to diagnose Alzheimer’s disease?

Diagnosis may involve cognitive assessments, blood tests, brain imaging such as MRI or CT and specialised tests such as PET scans when clinically appropriate.

3. Can a blood test detect Alzheimer’s disease?

Some newer blood tests can identify biomarkers associated with Alzheimer’s disease. However, they are not suitable for everyone and should be interpreted by a healthcare professional.

4. Is memory loss always a sign of Alzheimer’s?

No. Memory problems can also result from ageing, medication, sleep problems, vitamin deficiencies, thyroid disorders and other health conditions.

5. When should I see a doctor for memory loss?

Consult a healthcare professional if memory problems are persistent, worsening or begin to affect work, daily activities, relationships or independence.