Aggression is one of the worries many families have when they think about dementia.
It is also one of the most misunderstood.
Many people assume aggression is a common or inevitable part of dementia. In reality, most people living with dementia are not aggressive. Some may experience anger, agitation or distress at times, but this is usually a minority of cases and it is often linked to something specific.
This is an important difference.
When someone living with dementia becomes annoyed, upset or angry, it does not automatically mean dementia has made them aggressive. It may mean they are frightened, frustrated, tired, in pain, overstimulated or struggling to understand what is being asked of them.
It may also mean we need to change the way we communicate.
At The Ness Care Group, we support individuals and families across Devon who are living with memory loss, mild cognitive impairment and dementia. We know families can feel worried when mood or behaviour changes appear. But we also know that understanding what sits behind those changes can make the situation feel less frightening and more manageable.
The best starting point is not, “How do we stop this behaviour?”
A better question is, “What might be causing this reaction?”
Dementia does not always affect mood and emotion first
Dementia affects the brain, but not every type of dementia affects the same part of the brain in the same way.
In Alzheimer’s disease, which is the most common cause of dementia, early changes often affect memory. This is why repeated questions, forgetting recent conversations or struggling to remember appointments are often among the first signs families notice.
The hippocampus, a part of the brain important for memory, is one of the areas commonly affected early in Alzheimer’s disease.
Personality, judgement, impulse control and emotional regulation are more closely linked with the frontal areas of the brain. Conditions such as frontotemporal dementia, sometimes called FTD, are more likely to involve early changes in personality, behaviour or language. But FTD is much less common than Alzheimer’s disease.
This is why it is too simplistic to say that dementia causes aggression.
Sometimes dementia affects emotion and behaviour. Sometimes it does not. Sometimes the issue is less about aggression and more about frustration, fear, communication or loss of control.
That is why behaviour changes need careful thought.
Mood changes are often more common than aggression
Mood changes in dementia may include anxiety, irritability, low mood, tearfulness, suspicion, restlessness or reduced confidence.
A person may seem more easily upset. They may become quieter. They may avoid social situations. They may become frustrated when plans change or when they are asked to do something quickly.
These changes can be upsetting for families, especially when the person has always been calm, sociable or independent.
But mood changes do not always mean the person is becoming aggressive. They may be trying to manage a world that has started to feel less predictable.
They may be working much harder than everyone realises to follow a conversation, make a decision or stay in control of ordinary daily life.
Is it dementia, or is it the situation?
This is one of the most useful questions families can ask.
Sometimes a person’s emotional response is linked to changes in the brain. But sometimes it is linked to the situation around them.
For example, a person may become angry because they have been told they can no longer drive. That reaction may not be “aggression caused by dementia”. It may be a very human response to losing independence, freedom and identity.
Driving is not just transport. For many people, it represents adulthood, choice, confidence and control. Being told they can no longer drive can feel humiliating or frightening.
The same can happen with other changes.
A person may become annoyed if they are corrected too often. They may become defensive if family members talk over them. They may resist help if they feel they are being treated like a child. They may become upset if decisions are made around them rather than with them.
In these moments, the question is not only, “Has dementia affected their emotions?”
It is also, “Do we need to change how we are communicating?”
Communication can change the whole situation
Dementia can make it harder to process information, follow explanations and respond quickly. Long conversations, too many questions or too much correction can increase frustration.
A person may need more time to understand what is being said. They may need simpler choices. They may need reassurance before information. They may need to feel involved, not managed.
Small changes in communication can make a real difference.
It can help to:
- speak calmly and slowly
- use short, clear sentences
- avoid arguing over small details
- offer two simple choices rather than open-ended questions
- give the person time to respond
- explain what is happening before helping
- avoid talking about the person as though they are not there
- focus on the feeling behind the words, not only the facts
This is not about pretending everything is fine. It is about communicating in a way the person can process.
That is often where families can regain some confidence.
Common reasons someone may seem angry or upset
When mood changes happen, there is usually a reason. Sometimes there is more than one.
Pain or physical discomfort
Pain is easy to miss in dementia. A person may not be able to say, “My tooth hurts,” or “I feel unwell.” Instead, they may become restless, withdrawn, irritable or resistant.
Constipation, infection, dehydration, hunger, tiredness, medication side effects, poor sleep or needing the toilet can all affect mood and behaviour.
A sudden change in behaviour should always be taken seriously. If someone becomes suddenly more confused, distressed, agitated or unusually angry, it is sensible to speak to a GP or seek medical advice.
Too much noise or activity
Busy environments can become overwhelming. Background noise, several people talking at once, clutter, poor lighting or an unfamiliar setting can make it harder for the person to make sense of what is happening.
What looks like anger may actually be overload.
Reducing noise, moving to a calmer space or giving the person time to settle can sometimes change the situation quickly.
Loss of confidence
Dementia can make familiar tasks feel less certain. A person may lose confidence before they lose ability.
They may become anxious about going out, meeting people, using appliances, managing money or following a conversation. If they feel embarrassed or exposed, they may respond with irritation.
That does not mean they are being difficult. It may mean they are trying to protect themselves from feeling foolish or vulnerable.
Loss of control
People living with dementia can quickly find that others start making decisions for them.
This may come from love and concern, but it can still feel disempowering. Being hurried, corrected or told what to do can increase frustration.
Where possible, it helps to keep the person involved. Offer choices. Ask what matters to them. Keep routines familiar. Explain changes gently.
Support should protect dignity and choice, not remove them before it is necessary.
What to do if someone does become aggressive
If someone with dementia becomes verbally or physically aggressive, safety comes first.
Try to keep your voice calm. Give the person space. Avoid standing too close or blocking their way. Do not argue or try to force a long explanation in the moment.
Simple reassurance is often more helpful.
You might say:
“You are safe.”
“I can see this is upsetting.”
“Let’s take a moment.”
If the room is noisy or busy, reduce stimulation where possible. Turn off the television. Ask other people to step back. Move to a quieter space if it is safe.
It can also help to check basic needs. Are they in pain? Hungry? Thirsty? Too hot? Too cold? Tired? Do they need the toilet?
If anyone is at immediate risk of harm, call 999. Dementia may explain behaviour, but families should not feel they have to manage danger alone.
How to reduce distress over time
After a difficult moment, try not to blame the person or go over the incident in detail. They may not remember it clearly. They may remember the feeling more than the facts.
Once things are calm, it can help to look for patterns.
Think about:
- what happened just before
- whether the person was tired, hungry or in pain
- whether the room was noisy or busy
- whether they were being rushed
- whether a routine had changed
- whether they felt embarrassed or corrected
- whether the communication was too complicated
This can help families understand whether the issue is linked to health, environment, communication, routine or emotion.
Over time, small adjustments can reduce distress. A steadier routine can help. So can meaningful activity, social connection, movement, familiar tasks and conversations that help the person feel included.
The aim is not to control every reaction. It is to create the conditions where the person feels safer, more respected and more able to engage.
Why specialist dementia knowledge matters
When mood or behaviour changes happen, families often need more than reassurance. They need someone who understands dementia properly and can help them think through what may be happening.
A general social activity may provide company, and that can be helpful. But when confidence, mood or communication are changing, families often need something more purposeful.
At The Ness Care Group, we use Cognitive Stimulation Therapy, an NHS-recognised and evidence-based approach for people living with mild to moderate dementia.
CST uses structured group activity and discussion to support thinking, communication and wellbeing. At Ness, this specialist understanding sits behind the way sessions are planned.
Activities are chosen with purpose. They may support memory, communication, confidence, movement, mood or social connection.
Families are not just looking for something to occupy the day. They are looking for reassurance that the person they love is understood by people who are experts in dementia.
How The Ness Care Group can help
The Ness Care Group provides specialist dementia and cognitive health support across Devon, including Exmouth, Chudleigh, Teignmouth and Kingsteignton.
We support people living with memory loss, mild cognitive impairment and dementia. We also support families and carers, because dementia affects the whole household.
Our services include Cognitive Stimulation Therapy, therapeutic day sessions, structured group support, reminiscence work, creative sessions and gentle movement. We also offer family guidance, carer support groups, family dementia training and professional dementia training.
For individuals, our sessions provide structure, social connection and purposeful activity in a warm, supportive setting.
For families, our training and carer support groups offer space to understand dementia more clearly, learn practical ways to respond to changes in mood and behaviour, and talk with people who understand the reality of caring.
Our approach is clinically led, but not cold or impersonal. The aim is to combine specialist knowledge with warmth, routine and human connection.
For many families, it starts with a conversation. You can talk through what has been happening, ask questions and get a clearer sense of what support may be useful, whether that is a visit to one of our hubs, a trial session, family training or a carer support group.
When should families ask for help?
It is worth asking for help if mood changes are becoming more frequent, communication is becoming harder, daily routines are becoming more stressful or the person is becoming more anxious, withdrawn or distressed.
It is also important to ask for help if family carers feel exhausted, worried or unsure how to respond.
Support does not need to wait until crisis point. The earlier families understand what is happening, the easier it can be to keep life calmer, more connected and more manageable.
At The Ness Care Group, we help individuals and families understand dementia and find practical ways forward. If mood changes, communication difficulties or occasional aggression are becoming difficult at home, support can begin with a conversation.