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Dementia is a condition that affects memory, thinking and the ability to carry out daily activities, and the World Health Organization explains that it can be caused by many different diseases that damage the brain. It is not one illness, and it is not a normal part of getting older. The early signs are often small and easy to explain away: forgetting recent events, losing track of time, struggling to find words. Any one of them can have another cause. What matters is a pattern that is new, that keeps happening, and that starts to affect everyday life. This page describes those signs so you can take something specific to a doctor. It cannot diagnose anyone, and it does not try to.
What Dementia Is, and What It Is Not
WHO describes dementia as a condition affecting memory, thinking and the ability to perform daily activities, caused by many different diseases that damage the brain. Alzheimer disease is the most common form and, according to WHO, may contribute to 60 to 70% of cases. WHO reports that 57 million people worldwide were living with dementia in 2021, with nearly 10 million new cases every year.
Two things follow from that description. First, dementia is a set of symptoms with an underlying cause, so finding the cause is part of the doctor’s job. Second, WHO states that although dementia is more common after the age of 65, it is not an inevitable part of ageing. The NHS puts the same point plainly: dementia is not a natural part of ageing. That is exactly why symptoms are worth reporting rather than accepting quietly.
Early Signs That Are Worth a Doctor Visit
WHO lists these among the early signs and symptoms:
- forgetting things or recent events
- losing or misplacing things
- getting lost when walking or driving in familiar places
- being confused, even in familiar places, and losing track of time
- difficulty solving problems or making decisions
- problems following conversations or finding the right word
The NHS describes common early symptoms in similar terms: memory loss, difficulty concentrating, finding it hard to carry out familiar daily tasks, struggling to follow a conversation or find the right word, being confused about time and place, and mood changes.
No single item on either list means a person has dementia. Any one of them, if it is new and keeps happening, is a reason to see a doctor.
Ageing Changes and Dementia Are Not the Same Thing
Almost everyone forgets a name, walks into a room and forgets why, or misplaces keys. Doctors do not look at a single lapse. They look at a pattern, and these are the questions that help them:
- Is it a change from this person’s own usual level? Someone who was always a little disorganised is different from someone who managed the household accounts for forty years and now cannot.
- Is daily life affected? Forgetting a name is different from being unable to follow the steps of a familiar recipe, manage money, or find the way home on a route walked for years.
- Have other people noticed? Family members, neighbours and colleagues often notice before the person does.
- Is it continuing, or getting harder, over months? A change that keeps building over months is worth reporting.
This is not a test and cannot be scored. It is a way of describing what you have noticed so that a doctor has something specific to work with.
Sudden Confusion Is Different — and It Is Urgent
If an older person becomes confused suddenly — over hours or a day or two, rather than months — treat it as urgent. In India, call 108 or take them to the nearest hospital emergency department. The NHS advises emergency assessment for anyone who suddenly becomes confused, because many causes need to be treated as soon as possible and can sometimes be life threatening.
Sudden confusion, which doctors call delirium, has many possible causes. The NHS lists infections, and particularly urinary tract infections in older people, along with a stroke or TIA, low blood sugar in people who have diabetes, a head injury, some prescribed medicines, alcohol poisoning or withdrawal, drug use, carbon monoxide poisoning, severe asthma attacks or heart and lung problems, and some seizures.
While you arrange help, the NHS suggests staying with the person, reassuring them, using simple language, and noting down the medicines they take. It advises against asking a lot of questions or restricting their movement, unless they are in danger.
If the confusion comes with weakness on one side, a drooping face or slurred speech, read stroke warning signs and act on them immediately.
Changes in Mood and Behaviour
WHO notes that in the early stages a person may feel anxious, sad or angry about their memory loss, that personality may change, that they may withdraw from work or social activities, and that they may show less interest in other people’s emotions.
Families often notice this before they notice the memory itself: a parent who stops going to the temple or the park, avoids the phone, or becomes unusually irritable. These changes can also have other explanations, and a doctor is the right person to sort out which is which. Reporting them is more useful than trying to interpret them at home.
Only a Doctor Can Diagnose Dementia
There is no home test, phone app or online quiz that can diagnose dementia. A doctor usually takes a detailed history, often speaking to a family member who sees the person every day, examines them, and may use structured memory and thinking assessments. Blood tests and sometimes a brain scan may be arranged, partly to look for other conditions that can produce similar symptoms.
If blood tests are done, reference ranges vary by laboratory, method, age, sex, pregnancy and clinical context. Read the range printed on your own report next to your own result, and let the treating doctor interpret it. A figure that sits a little outside a printed range does not, by itself, explain a memory problem, and this page cannot tell you what any result means.
The NHS advises talking to a GP sooner rather than later if you are worried about memory problems or other symptoms.
How to Prepare for the Appointment
A doctor can do more with specific examples than with the word forgetful. Before the visit:
- Write down what changed, roughly when it started, and whether it has stayed the same or continued to build.
- Note two or three concrete examples, with dates if you have them.
- Take a written list of every medicine the person takes, including anything bought without a prescription and any traditional or herbal preparation.
- Carry past reports, discharge summaries and any earlier scans.
- Take someone along who sees the person daily.
- Mention any hearing or vision difficulty, and any recent fall, illness, hospital stay or bereavement.
Never stop, start or change a medicine on your own before or after the appointment. That decision belongs to the treating doctor.
Care at Home After a Diagnosis
If a diagnosis is made, the day-to-day work happens at home: a steady routine, a safe environment, help with washing, dressing and meals, company, and support for the family member doing most of the caring. The medical plan stays with the treating doctor; the home routine is what carries it out.
Families in Bangalore often arrange dementia care at home, or, where the diagnosis is Alzheimer disease specifically, Alzheimer’s care at home. Neither replaces medical review, and neither replaces an emergency visit if something changes suddenly.
Frequently asked questions
What are the early warning signs of dementia?
The World Health Organization lists forgetting recent events, losing or misplacing things, getting lost in familiar places, confusion and losing track of time, difficulty solving problems or making decisions, and trouble following conversations or finding words. The NHS adds difficulty concentrating, trouble with familiar daily tasks and mood changes. Any of these, if new and persistent, deserves a doctor visit.
Is memory loss just a normal part of getting older?
No. WHO states that although dementia is more common after age 65, it is not an inevitable part of ageing, and the NHS says dementia is not a natural part of ageing. Occasional forgetfulness is common, but a change from a person’s usual level that keeps happening and affects daily life should be assessed by a doctor.
How is dementia different from sudden confusion?
The changes seen in dementia usually build gradually over months. Sudden confusion, called delirium, appears over hours or days. The NHS advises emergency assessment for anyone who suddenly becomes confused, because causes such as infection, stroke, low blood sugar, head injury or medicines need treating quickly and can sometimes be life threatening. Sudden confusion is not a wait-and-watch problem.
Can an online test or app diagnose dementia?
No. Only a doctor can diagnose dementia. Diagnosis usually involves a detailed history, often with a family member present, a physical examination, structured memory and thinking assessments, and sometimes blood tests or a brain scan to look for other causes of similar symptoms. No website, quiz or checklist, including this page, can make that judgement.
Is dementia the same thing as Alzheimer’s disease?
Not quite. Dementia is the set of symptoms; Alzheimer disease is one of the diseases that can cause it. WHO describes Alzheimer disease as the most common form of dementia, contributing to an estimated 60 to 70% of cases. Other diseases that damage the brain can also cause dementia, which is why identifying the cause is part of medical assessment.
What should we write down before the doctor’s appointment?
Note what changed and roughly when, two or three specific examples rather than general words, and whether the change has continued over months. Carry a written list of all current medicines, past reports and discharge summaries, and take along someone who sees the person daily. Mention any recent fall, illness, hospital stay, or hearing and vision difficulty.
Sources
World Health Organization - Dementia fact sheet · NHS - Symptoms of dementia · NHS - Sudden confusion (delirium)
Last checked 2 September 2026. How we write and check these pages: editorial policy.
Day-to-day support at home
Varolyn arranges trained attendants and nurses in Bangalore for families managing dementia at home, working to the plan the treating doctor sets. Diagnosis, medicines and review always stay with the doctor, and anything sudden goes to hospital.