Dementia and Lying: Understanding Your Loved One’s Behaviour
The short answer: People with dementia are rarely lying in the way we usually mean it. What looks like deliberate deception is almost always a symptom of the condition — rooted in memory loss, confusion, or emotional distress. Understanding why it happens can make it much easier to respond with patience rather than frustration.
Why Does Dementia Cause Lying?
Dementia affects the parts of the brain responsible for memory, reasoning, and self-awareness. When these functions break down, a person may say things that are not true — but they are often not choosing to deceive you. Their brain is filling in gaps, protecting their self-esteem, or expressing an emotion they cannot otherwise articulate.
There are several distinct reasons this happens, and it helps to know which one you might be dealing with.
The Main Reasons a Person with Dementia May Not Tell the Truth
1. They genuinely believe what they are saying
This is the most common situation. The person is not lying — they are telling you what they believe to be true. Dementia can distort memory in several ways:
Confusion and memory distortion Dates, people, and conversations can become scrambled. Your loved one may recall an event accurately but place it in completely the wrong time or context.
Confabulation Confabulation is when the brain unconsciously fills gaps in memory with invented details that feel entirely real to the person. They are not making things up deliberately — their brain is constructing a plausible version of events without them realising it. A common example is vividly recounting a conversation with someone who died years ago.
Hallucinations and delusions Dementia can cause a person to see, hear, or feel things that are not there (hallucinations), or to hold false beliefs that feel completely real to them (delusions). If your loved one describes something that seems impossible, they may be reporting their genuine experience rather than fabricating a story.
2. They are embarrassed about forgetting
Nobody likes to feel like they are losing their grip on reality. A person with dementia may be acutely aware — at least some of the time — that their memory is failing them. Telling a white lie can feel safer than admitting they cannot remember.
For example:
- “The shop was closed” may mean: I forgot my purse and felt ashamed
- “The bus never came” may mean: I got on the wrong one and couldn’t find my way back
- “I already ate” may mean: I genuinely don’t remember, and I don’t want to seem confused
This kind of covering up often comes from fear — fear of losing independence, fear of being a burden, or fear of what it means if people realise how much they are struggling.
3. They are protecting you
Some people with dementia underplay their difficulties to avoid worrying the people they love. They may tell you things are fine when they are not, or insist they are coping when they clearly are not. This is not manipulation — it is often a deeply caring instinct that has become detached from their ability to judge the situation clearly.
4. Their mental health is suffering
Dementia can surface long-buried memories and emotions, and it can also cause depression, anxiety, and loneliness. Lies or distorted stories can sometimes be a way of expressing a real feeling that the person cannot put into words.
If your loved one keeps returning to a sad or troubling story — even if the details do not add up — the emotion behind it is likely very real. They may not be able to tell you they feel lonely or frightened, but their behaviour may be showing you exactly that.
How to Respond: Practical Guidance for Families
Don’t take it personally
This is easier said than done, especially when the same story is repeated daily or when you know for certain something is untrue. But dementia genuinely impairs the brain’s ability to form accurate memories and regulate behaviour. Your loved one is not choosing to deceive you — they are coping with a condition that has changed how their mind works.
Think carefully before correcting them
Correcting a person with dementia — especially repeatedly — can cause real distress. It can damage their confidence, trigger agitation, and make them withdraw. In most cases, being right is far less important than keeping them calm and secure.
A technique called Validation Therapy is widely used in dementia care for exactly this reason. Rather than challenging a false statement, you acknowledge the emotion behind it.
Example: If your loved one says they just spoke to a relative who passed away years ago, rather than correcting them, you might say: “It sounds like you’ve been thinking about them. What do you remember most about them?”
This approach validates their emotional reality without reinforcing confusion or causing distress.
There are exceptions — if the false belief is causing them harm, or if clarity is needed for a practical or safety reason, gentle redirection may be necessary. But as a general rule, emotional comfort takes priority over factual accuracy.
Look for what the behaviour is telling you
Frequent untruths can be a window into how your loved one is truly feeling. Ask yourself:
- Are they lonely or lacking stimulation?
- Are they frightened about their condition or their future?
- Are they struggling with a daily task they have not told you about?
- Could they be experiencing depression or anxiety?
If the lying seems to cluster around particular topics or times of day, that pattern can tell you something important about their unmet needs.
Consider whether they need more support
If your loved one is hiding how much they are struggling — or if their confusion has reached the point where they frequently cannot distinguish reality — it may be time to think about whether their current level of support is still right for them.
Understanding care needs assessments is a useful first step if you are not sure what level of care they require. If you are at the stage of weighing up options, our guide to choosing the right care home for your loved one walks through the key considerations.
Frequently Asked Questions
Is lying a symptom of dementia? Not in the traditional sense — people with dementia are rarely lying deliberately. What appears to be lying is usually confabulation, memory distortion, confusion, or an attempt to mask their struggles. It is a symptom of how dementia affects the brain, not a character trait.
What is confabulation in dementia? Confabulation is when the brain unconsciously invents details to fill gaps in memory. The person believes entirely in what they are saying. It is not the same as lying — they have no awareness that the information is false.
Should I correct someone with dementia when they say something untrue? In most cases, no. Correcting them repeatedly causes distress and can worsen agitation. Validating the emotion behind what they are saying is usually more helpful than insisting on the facts.
Why does my parent with dementia accuse me of things that aren’t true? This is common and deeply upsetting. False accusations often stem from paranoia, delusions, or an attempt to explain something confusing — like missing belongings. It is rarely personal. Responding calmly, without becoming defensive, and trying to understand what underlying fear or confusion might be driving it will usually help more than arguing.
When should I seek professional help? If the behaviour is escalating, causing distress, or suggesting your loved one is no longer safe or able to cope at home, it is worth speaking to their GP or seeking a care assessment. Signs it may be time to consider a care home can help you work through this decision.
A Quick Reference Guide
| What you observe | What may really be happening |
|---|---|
| Vivid but impossible story | Confabulation — brain filling memory gaps |
| Denying they forgot something | Embarrassment or fear of losing independence |
| Insisting everything is fine | Protecting you; masking difficulties |
| Repeating a sad or distressing story | Depression, grief, or unmet emotional need |
| Accusations of theft or deception | Paranoia or delusion related to dementia |
Supporting a Loved One with Dementia
Navigating dementia as a family is exhausting, and the emotional weight of being misled — even when you understand why — should not be underestimated. Give yourself permission to find it hard.
If you are caring for someone at home, our guide on dementia care at home covers practical strategies for managing day-to-day challenges. And if you are thinking about whether residential dementia care might be the right next step, our team at Lidder Care is happy to talk things through with you — no obligation, just a conversation.
Dr. Lidder (MB BS, DPM, MRCPsych) is a highly respected healthcare professional with extensive experience in elderly care. He served as a Consultant Psychiatrist for the NHS’s Mental Health Services for Older People, demonstrating a deep commitment to the wellbeing of older adults. Recognising the need for quality care facilities in Mansfield, Dr. Lidder founded Lowmoor Nursing Home and Newgate Lodge Care Home, both thoughtfully designed to provide therapeutic environments for individuals with dementia.
Following his retirement, Dr. Lidder remains actively involved as a Director at Lidder Care, ensuring the homes maintain the highest standards and provide warm, welcoming environments. He also offers invaluable support through bereavement and supportive counselling, utilising his expertise to assist families in understanding dementia diagnoses and navigating the associated emotional challenges.