Alzheimer’s disease is the most common cause of dementia, affecting millions of people worldwide and placing a significant emotional, physical, and financial burden on individuals, families, and healthcare systems. It is a progressive brain disorder that gradually damages memory, thinking, reasoning, and the ability to carry out everyday activities.
In recent years, growing public awareness—including discussions surrounding broadcaster Fiona Phillips’ diagnosis of early-onset Alzheimer’s disease—has highlighted the importance of recognising symptoms early and seeking medical advice. These conversations have encouraged more people to learn about the condition and support those living with it.
Although Alzheimer’s disease is more common in older adults, it is not a normal part of ageing. Understanding its causes, recognising the early symptoms, and knowing when to seek medical attention can lead to earlier diagnosis, better symptom management, and improved quality of life.
According to the World Health Organization (WHO) Dementia Fact Sheet, Alzheimer’s disease is the most common cause of dementia, accounting for approximately 60–70% of dementia cases worldwide.
In this comprehensive guide, you’ll discover 15 essential facts about Alzheimer’s disease, including its causes, symptoms, stages, diagnosis, treatment options, prevention strategies, and practical advice for families and caregivers.
Alzheimer’s disease is a progressive neurological disorder that destroys brain cells and interferes with communication between different areas of the brain. As the disease progresses, people experience increasing difficulties with memory, language, reasoning, problem-solving, behaviour, and daily functioning.
Alzheimer’s disease accounts for approximately 60–70% of all dementia cases, making it the leading cause of dementia worldwide.
Unlike occasional forgetfulness associated with normal ageing, Alzheimer’s disease gradually worsens over time and eventually affects a person’s independence.
Alzheimer's Disease Is the Most Common Cause of Dementia
Many people mistakenly believe dementia and Alzheimer’s disease are the same.
In reality:
- Dementia is an umbrella term.
- Alzheimer’s disease is the most common disease that causes dementia.
Read more about Alzheimer’s disease risk factors on the Alzheimer’s Society (UK) website.
Understanding this difference helps people recognise why early diagnosis is important.
Alzheimer's Disease Is Not a Normal Part of Ageing
Growing older increases the risk of Alzheimer’s disease, but it does not mean someone will automatically develop it.
Normal ageing may involve occasionally forgetting names or misplacing keys. Alzheimer’s disease causes persistent memory problems that interfere with everyday life.
What Causes Alzheimer's Disease?
Researchers believe Alzheimer’s disease develops because of several factors working together.
These include:
- Amyloid plaques building up between brain cells.
- Tau tangles forming inside brain cells.
- Genetics.
- Increasing age.
- Inflammation.
- Blood vessel damage.
- Lifestyle factors.
Scientists continue to study why some people develop Alzheimer’s disease while others do not.
Early Symptoms of Alzheimer's Disease
he early symptoms of Alzheimer’s disease usually develop gradually.
Common symptoms include:
- Forgetting recent conversations.
- Repeating questions.
- Losing track of dates.
- Misplacing belongings.
- Difficulty finding words.
- Poor judgement.
- Mood changes.
- Becoming withdrawn.
- Confusion in familiar places.
Alzheimer's Disease Progresses in Stages
Alzheimer’s disease usually develops slowly over several years.
Early Stage
People may:
- Forget appointments.
- Lose items.
- Repeat stories.
- Find planning difficult.
Middle Stage
Symptoms become more noticeable.
People may:
- Need help with daily activities.
- Become confused.
- Wander.
- Have behavioural changes.
Late Stage
People often:
- Lose the ability to communicate.
- Require full-time care.
- Have difficulty eating and swallowing.
- Become physically frail.
Who Is Most at Risk?
Risk factors include:
- Age over 65
- Family history
- Down syndrome
- High blood pressure
- Diabetes
- Smoking
- Obesity
- Hearing loss
- Physical inactivity
How Is Alzheimer's Disease Diagnosed?
Diagnosis usually involves:
- Medical history
- Physical examination
- Memory tests
- Cognitive assessments
- Blood tests
- CT or MRI brain scans
Early diagnosis allows better planning and access to treatment.
Can Alzheimer's Disease Be Treated?
Although there is currently no cure for Alzheimer’s disease, treatment can help manage symptoms.
Treatment may include:
- Medication
- Cognitive stimulation therapy
- Occupational therapy
- Speech therapy
- Psychological support
- Lifestyle changes
Can Alzheimer's Disease Be Prevented?
Although Alzheimer’s disease cannot always be prevented, research suggests healthy lifestyle choices may reduce the risk. The World Health Organization recommends maintaining cardiovascular health, staying physically active, eating a balanced diet, avoiding smoking, and remaining socially engaged to help reduce the risk of cognitive decline and dementia.
The World Health Organization recommends maintaining cardiovascular health, staying physically active, eating a balanced diet, avoiding smoking, and remaining socially engaged to help reduce the risk of cognitive decline and dementia.
These include:
- Exercising regularly.
- Managing blood pressure.
- Controlling diabetes.
- Eating a healthy diet.
- Staying mentally active.
- Remaining socially connected.
- Getting enough sleep.
- Avoiding smoking.
- Limiting alcohol.
Alzheimer's Disease Affects More Than Memory
Many people think Alzheimer’s disease only affects memory.
However, it can also affect:
- Behaviour
- Personality
- Communication
- Vision
- Balance
- Decision-making
- Emotional wellbeing
Supporting Someone Living With Alzheimer's Disease
Providing compassionate, person-centred care can improve quality of life.
Helpful tips include:
- Speak calmly.
- Maintain routines.
- Encourage independence.
- Avoid arguing.
- Offer reassurance.
- Keep the home safe.
- Encourage hydration.
- Promote meaningful activities.
Caring for the Caregiver
Caregiving can be physically and emotionally demanding.
Caregivers should:
- Take regular breaks.
- Ask for help.
- Join support groups.
- Maintain their own health.
- Seek emotional support when needed.
Looking after yourself enables you to provide better care for others.
When Should You See a Doctor?
Seek medical advice if someone develops:
- Persistent memory loss.
- Confusion.
- Behavioural changes.
- Difficulty performing everyday tasks.
- Personality changes.
Not every memory problem is Alzheimer’s disease, but it should always be assessed.
Common Myths About Alzheimer's Disease
Myth
Only elderly people get Alzheimer’s disease.
Fact
Some people develop early-onset Alzheimer’s disease before age 65.
Myth
Memory loss always means Alzheimer’s disease.
Fact
Memory problems can have many causes, including stress, depression, medication side effects, thyroid disorders, and vitamin deficiencies.
Myth
Nothing can be done after diagnosis.
Fact
Early diagnosis allows treatment, planning, and access to support services.
Research Gives Hope
Scientists around the world continue to develop:
- New medicines.
- Earlier diagnostic tests.
- Blood tests.
- Better imaging technology.
- Lifestyle interventions.
Research continues to provide hope for better treatments and improved quality of life.
Frequently Asked Questions (FAQs)
What is the difference between Alzheimer’s disease and dementia?
Dementia describes a group of symptoms affecting memory and thinking, while Alzheimer’s disease is the most common disease that causes dementia.
Can Alzheimer’s disease be cured?
There is currently no cure, but treatments may help manage symptoms and improve quality of life.
What is usually the first sign of Alzheimer’s disease?
Memory loss affecting daily life is often the earliest symptom.
Can younger adults develop Alzheimer’s disease?
Yes. Although uncommon, early-onset Alzheimer’s disease can occur before the age of 65.
Is Alzheimer’s disease hereditary?
Most cases are not directly inherited, although family history may increase the risk.
Conclusion
Alzheimer’s disease is one of the leading causes of dementia and continues to affect millions of individuals and families worldwide. Although there is currently no cure, recognising the symptoms early, seeking medical advice, and accessing appropriate support can greatly improve quality of life.
Understanding Alzheimer’s disease also helps reduce stigma and encourages communities to become more supportive of those living with the condition. By adopting healthy lifestyle habits, managing conditions such as high blood pressure and diabetes, and staying mentally, physically, and socially active, we may help reduce the risk of cognitive decline.
If you or someone you know experiences persistent memory loss, confusion, or changes in thinking, don’t ignore the symptoms. Speak to a healthcare professional for assessment and guidance.
References
Alzheimer’s Association. (2025). Alzheimer’s disease. https://www.alz.org/
Alzheimer’s Disease International. (2024). World Alzheimer Report. https://www.alzint.org/
Alzheimer’s Society. (2025). Alzheimer’s disease. https://www.alzheimers.org.uk/
Centers for Disease Control and Prevention. (2025). About Alzheimer’s disease. https://www.cdc.gov/alzheimers/
National Institute on Aging. (2025). Alzheimer’s disease fact sheet. https://www.nia.nih.gov/health/alzheimers
National Health Service. (2025). Alzheimer’s disease. https://www.nhs.uk/conditions/alzheimers-disease/
World Health Organization. (2026). Dementia. https://www.who.int/news-room/fact-sheets/detail/dementia
Vivian Okpala is a Public Health Educator and Founder of VeeVee Health. She creates evidence-based health content focused on blood sugar control, blood pressure management, weight management, and preventive health, with a strong emphasis on culturally relevant nutrition and lifestyle guidance.
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