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Early signs of dementia: a checklist

Reading time: 4 minutes Last reviewed: 8th May 2026 Clinically reviewed by Dr Arpita Chakrabarti, Consultant Clinical Psychiatrist (GMC 5180513)

In plain English

This is a plain-English checklist of the changes that most often appear early in dementia. It is here to help you decide whether to see a GP, and to organise what you have noticed. It is not a diagnostic test. Having one or two of these does not mean a person has dementia; many have other, often treatable, causes. What matters is the pattern: signs that are persistent, getting worse, and starting to affect daily life.

The checklist

Tick any that apply, ideally with an example and a rough date.

How to read your answers

A single occasional lapse is common and usually means nothing worrying. The signs above become meaningful when several appear together, persist over weeks or months, get worse rather than better, and begin to interfere with everyday life. If that describes what you or your family have noticed, it is worth a GP appointment, not to alarm, but because the right checks at the right time make a real difference.

It is also worth knowing that family and friends often notice these changes before the person does. If others have remarked that someone seems different, that observation is valuable and worth acting on.

It may not be dementia

Several conditions can cause the same early signs and many are reversible. Depression and anxiety, poor sleep or sleep apnoea, thyroid problems, Vitamin B12 deficiency, certain medicines, alcohol, recent illness, and uncorrected hearing or vision loss can all affect memory and thinking. A proper assessment is worthwhile precisely because it can find, and treat, one of these. See Dementia or normal ageing? and Mild Cognitive Impairment.

Preparing for your GP visit

A short amount of preparation helps your GP a great deal.

  1. Note specific examples of the signs you have ticked, with rough dates, over a week or two.
  2. List current medicines, including anything bought without a prescription.
  3. Note any family history of dementia, and any recent illnesses, falls or low mood.
  4. Bring someone who knows you well; their perspective is genuinely useful.
  5. Write down your main questions so they are not forgotten in the appointment.

Your GP will ask about the changes, check for treatable causes, and may do a brief cognitive test and some blood tests. If appropriate, they will refer you to a memory clinic. See what happens at a memory assessment.

Frequently asked questions

How many signs mean I should see a doctor?

There is no fixed number. The deciding factors are persistence, worsening over time, and interference with daily life. If those apply, see your GP even if only one or two signs are present.

What is usually the first sign of dementia?

It varies by type. In Alzheimer's Disease it is often short-term memory loss. In Frontotemporal Dementia it is more often a change in behaviour or language. In Dementia with Lewy Bodies, fluctuating attention and visual hallucinations can come early.

Is there an online test that can diagnose dementia?

No. Online checklists and tests, including this one, can help you decide whether to seek advice, but only a clinical assessment can diagnose dementia.

Should I tell the person I am worried about them?

Often, yes, gently and privately, focusing on specific examples and on getting things checked rather than on labels. Many people are relieved to share a worry they have been carrying alone.

What to do next

  1. Complete the checklist with examples and dates.
  2. If the signs are persistent, worsening, or affecting daily life, book a GP appointment.
  3. Take the checklist and a list of medicines with you, and bring someone who knows you well.

References

  1. National Institute for Health and Care Excellence. NG97: Dementia, assessment, management and support.
  2. NHS. Symptoms of dementia. https://www.nhs.uk/conditions/dementia/
  3. Alzheimer's Society. Dementia symptoms checklist. https://www.alzheimers.org.uk
  4. World Health Organization. ICD-11 Chapter 06: Neurocognitive disorders.
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