Triggers for Dementia Outbursts

Potential Triggers That Can Upset Seniors with Dementia

By In Home Care | July 14th, 2025

Key Takeaways
- Anger and aggression in people with dementia can be due to many things, from environmental factors like noise and clutter to pain (such as from constipation), hunger (or poor nutrition), and fatigue. Outbursts can be upsetting to both caregivers and their loved ones.¹
- It’s vital that you stay calm and identify a possible cause you can fix, like keeping a meal schedule or listening more closely to their feelings. Some people may require drug therapies or professional care to manage symptoms.

There are simple ways to respond to anger and aggression in dementia that can limit episodes caused by frustration, physical discomfort, or medication side effects.² Sleep disruptions and psychosis are common, and medications like Rixulti (brexpiprazole) may be needed to treat emotional outbursts, physical aggression, and other concerning behaviors.

Have you ever woken up from a frightening or stressful dream, only for lucidity to linger just out of reach for a few minutes? That sense of disorientation, of confusion, of alarm, feeling like things are amiss but not fully understanding why? Experiences like those may be the closest analogs we have to what individuals suffering from dementia go through on a regular basis.

As the memory loss progresses, and the symptoms escalate, the primary objective of memory care becomes soothing discomfort and distress—and by extension, easing the burden of care for the family caregivers. Perhaps the most daunting challenge at this stage is managing and minimizing the triggers for dementia. While it’s not really possible to avoid triggering the patient altogether, there are steps you can take to limit the frequency and severity of these episodes.

Dementia, Behavioral Changes, and the Impact of Triggers

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To understand triggers and how they might cause emotional distress for a dementia patient, it’s necessary to understand how dementia and its symptoms can impact the patient’s behavior. Initially, the signs may consist primarily of odd bouts of forgetfulness and inattentiveness. As their condition progresses, though, those initial symptoms will escalate, and each dementia symptom will develop into a new challenge.

Confusion, dissociation, and difficulties with spatial awareness may follow. You might also see periodic episodes where the patient struggles to express themselves clearly with language. There may be changes leading to poor judgement and lack of restraint, and eventually they will reach a point in cognitive decline where they need supervision or help with tasks critical to their independence.

This dementia behavior is due to how their particular diagnosis is progressively wearing down the “hardware” that makes up the nervous system. Throughout all of this, the “software”—their mind, their cognition, and to some extent their body itself—is making earnest attempts to adjust and accommodate in order to cope with the damaged brain cells.

The end result that’s visible on the outside is a patient that is doing their very best to carry on as normal, all while they are steadily losing access to the tools that they previously used to do that.

How this affects behavior will vary, both by patient, and from moment-to-moment. But you might see the patient become more irritable and easily frustrated. You may see a decrease in energy and motivation similar to a depression diagnosis. There may be times when the individual makes choices that are confusing or alarming, like going for a job wearing a dress and slippers.

Triggers for dementia outbursts can include:

Physical Discomfort: Pain, hunger, thirst, or discomfort due to environmental factors like temperature or noise can lead to frustration and aggression.
Emotional Triggers: Fear, anxiety, and stress can arise from confusion, unfamiliar surroundings, or past traumatic experiences.
Environmental Factors: Overstimulation from noise or light, or under stimulation leading to boredom, can cause distress.
Communication Issues: Difficulty in expressing needs or feelings can lead to frustration and aggression.
Medication Side Effects: Some medications can cause restlessness or agitation as side effects.
Understanding these triggers can help caregivers manage and respond effectively to outburst in individuals with dementia.

1 SOURCE: How to Respond to Anger and Aggression in Dementia

These shifts and episodes will be cause for concern, and many will be the source of significant stress for a family caregiver. But anyone who has had to care for a dementia patient will likely tell you the most worrisome and difficult are the times when the patient becomes frightened, combative, or even outright violent (often for reasons that are unclear or not immediately apparent).

Such outbursts are frequently due to “triggers,” and learning to navigate and manage these triggers for dementia is a critical part of providing memory care for patients with these conditions.

Understanding Dementia Triggers: What They Are, and Why They Happen

You might be surprised to learn that angry outbursts aren’t necessarily a dementia symptom, strictly speaking. For the most part, it’s a response to symptoms (and frankly, a natural and understandable one).

Those dealing with dementia are facing cognitive impairment problems like frequent confusion and disorientation. Delusions and hallucinations are common. Memory loss has a tendency to turn familiar people, spaces, and events into frighteningly unfamiliar experiences. And many of the ways the mind seeks to protect itself through this process only complicate matters and add to the stress.

So it should come as no surprise that dementia patients often respond like they’re terrified. Even close family or long-term caregivers may at some point look like a stranger to them. But what exactly is provoking these reactions at the moment? Why do they go from a relative level of calm to a fight-or-flight response seemingly at the flip of a switch?

That’s where triggers come in. Most often, patients are provoked by a specific stimuli or change in their environment that they are unprepared for or unable to adjust to as they normally would.

How Anger Is Expressed in People With Dementia

When someone with dementia gets angry, they may:³

Raise their voice (yelling and screaming)
Use foul language
Burst into tears and throw things
Become violent, and bite, pinch, or kick people

Anger and aggression may develop in the middle stages of dementia.⁴ At the same time, there may be other challenging behaviors like sleep disturbances, wandering, and delusions.⁵

Sometimes, there are warning signs and you can take steps to limit effects, but anger without warning can be hard to cope with because it is unpredictable.

When to Call 911

Call 911 if you feel that you or someone else is in danger. If the person is threatening you or physically lashing out, stay out of reach and close to an exit, if possible. Try to stay calm and give them space to calm down as well. You can also get help by calling the Alzheimer’s Association Helpline at 800-272-3900.⁶

Tips for Coping With Dementia Outbursts

Here are some strategies you can take to cope with an emotional or physical outburst that’s dementia-related:⁷

Stay calm and don’t argue. Give the person a little space. Their response may be because they feel their personal space has been invaded, and they don’t know why.
Allow for time. If you’re helping with a task and they become angry, you may find that trying the same task 20 minutes later will produce a completely different result.
Look for a cause. Environment and physical factors can affect behavior. Pain, fatigue, or hunger can trigger anger and aggression. Limit noise, clutter, and other stressors. Play music, and keep the room well-lit.
Look for patterns in behavior. For example, the person may tend to get angry in the evening as part of a sundowning pattern. It may help to avoid naps during the day, or limit caffeine.
Give them a security object, whether a photo, pet, or pillow, that helps to calm them.⁸
Use a distraction, like music. Try playing some of your loved one’s favorite songs. It may help lighten the mood, as can sports or favorite television programs.

Think about what happened before the outburst. Was there noise? A lot of visitors? Certain events or activities that triggered the reaction? The more triggers you can identify, the easier it will be to avoid them.

Consider an underlying health reason for anger and aggression. A person may be constipated or have an infection. They may need hearing aid adjustments or cleaner eyeglass lenses. You can also try to make sure they know when it’s day or night by keeping windows open or seating them near one.³

Talk With Your Healthcare Provider

Sometimes, dementia can provoke so much aggression and anger that the person and those around them are no longer safe. Let your healthcare provider know if that’s the case. There are times when medications or treatment plans need to be changed.

Common Causes of Aggression With Dementia

Causes of aggression can be related to the disease itself or other factors, like depression because of the disease or not enough exercise.⁷ These causes can occur due to circumstances, too, including some of the following.

Loss of Recognition

People with dementia may not recognize their loved ones. For example, a wife with dementia may try to attack her husband. She may not do this out of anger but because she is afraid of the “strange man” in the house.

The fear, anxiety, and aggression sometimes follow changes in predictable life patterns, including:⁸

Moving to a new home or facility
Changes in who the caregiver is
Resistance to a task of daily living, like taking a bath or changing clothes

Paranoia, Delusion, and Hallucinations

People with dementia may also experience distortions of reality. For example, a person may have:

Paranoia
Delusions
Hallucinations

People with Lewy body dementia are more prone to having these symptoms. They can occur in all types of dementia, though not everyone will experience them.⁹

People with frontotemporal dementia may become physically aggressive much sooner than people with Alzheimer’s. This is because people with Alzheimer’s have damage to key brain regions that help them to manage thoughts and emotions.¹⁰

The frontal parts of the brain are responsible for:¹¹

Empathy
Impulse control
Personality
Judgment

The loss of these functions can lead to impulsive behaviors.

Poor Food Intake

Studies suggest poor eating habits and weight loss may be related to behavior problems in people with dementia.¹²

In people without dementia, poor nutrition can affect mood, energy, and cognitive function. In people with dementia, it can fuel sudden outbursts and aggressive impulses.

You can help reduce angry outbursts by making sure the person you’re caring for is eating the right foods. It will also help to keep the dining space calm.

Misunderstandings

Dementia affects communication. Someone with dementia may have trouble understanding what their caregiver is saying or doing.

The person you are caring for may not understand why you’re trying to help. They may feel like you’re just bossing them around. This can lead to conflict.

Caregiver Overload

As a caregiver, it’s natural to have strong feelings from time to time. You may feel frustrated, angry, or impatient. Even if you aren’t verbalizing those feelings, the person you are caring for may pick up on them. Sometimes they may reflect those feelings back to you.

A person with dementia may have catastrophic reactions. This is a sudden and disproportionate reaction to a seemingly normal situation. These reactions are often triggered by care. They can lead to anger and aggression.

Monitoring yourself for caregiver burnout and overload is important. This will help improve your own quality of life and also your loved one’s.

What About Rexulti and Other Drugs?

The Food and Drug Administration has approved Rexulti for the treatment of agitation in people diagnosed with dementia disorders.¹³ The drug changes the way that dopamine and serotonin, chemical messengers called neurotransmitters, act on the brain and nervous system.¹⁴

Research studies have shown brexpiprazole to be effective in treating agitation, improving quality of life for caregivers as well as those receiving treatment.¹⁵

Experts suggest that it’s safer than other medications used off-label, meaning they’re available but not approved specifically for dementia. These off-label medications include:⁸

Antidepressants
Anxiety medications
Antipsychotic drugs

Tegretol (carbamazepine), a seizure medication, can also sometimes be used. Belsomra (suvorexant) is FDA-approved for treating insomnia in people with Alzheimer’s disease.

While these drugs can make it easier to respond to agitation, they also carry some risks and side effects. Talk with your healthcare provider about the options available to help manage a loved one’s anger and aggression when dementia is the cause.You can think of triggers as falling into roughly three categories: internal, external, and physical. We’ll discuss triggers along these dividing lines for the sake of clarity, but be aware that they tend to blend together, and outbursts are often the result of multiple triggers occurring simultaneously.

Types of Dementia Triggers

Internal triggers are those that are caused by or related to the patient’s own emotional and mental state. Of the three types, this is the hardest to anticipate, influence, or manage, as human emotions are unpredictable things under even the best of circumstances. With dementia patients, you have the added factors of memory issues, communication struggles, and altered brain function.

Dementia often leads to psychological states and behavioral symptoms that mirror those of mental health conditions. They may experience feelings of sadness and despondency like a depression patient. Their fears and stress responses may be magnified similar to an anxiety condition. And they may engage in repetitive or ritualistic behavior like hoarding, fidgeting, wandering, etc.

Again, there may not be much you can do for them in this regard, and there may not be much in the way of advanced warning when they’re experiencing something that day that’s different than their baseline.

External triggers are the most common, and they’re the ones we have the most control over. That might include everything from environmental factors to sensory stimuli, to the patient’s routine, and beyond.

Dementia patients are already facing a great deal of unfamiliarity, even when in places or with people that otherwise wouldn’t be new to them. Because of this, they depend heavily on things that feel predictable, and they struggle with things that feel like a surprise. Changes, even small ones, can be traumatic, so where they are and what they’re doing are critical factors.

And even unexpected sensory input can be startling. The sudden start of a vacuum, or a dish that’s dropped and shatters. Bright flashing lights or being bombarded by questions from someone they’re speaking with. Any of these might be cause for alarm for them and can lead to an angry outburst.

Finally, we have physical triggers, which primarily refers to pain, discomfort, and other unpleasant sensations. These triggers are sometimes why patients will be reluctant to take medication or bathe, or why outbursts might follow a period of forgetting to eat or drink.

Examples of Potential Triggers That Might Upset Seniors with Dementia

Again, you can’t fully anticipate or prevent triggers and outbursts. What will cause agitation will vary by person, and may not be problematic every time. And a measure of alarm on their part is to be expected (and unavoidable). The goal is not to eliminate them, but to limit them wherever possible.

Below is a list of some common factors and triggers that might result in someone suffering from dementia becoming upset:

Unmet physical needs, like sleep disturbance, hunger, thirst, etc.
Overstimulation—such as loud or overwhelming conversation, excessively bright lighting, potent smells, uncomfortable clothing, physical pain, etc.
Understimulation—boredom, loneliness, restlessness, etc.
Unexpected changes to routine
Seeing new visitors, or when regular visitors don’t show
Relocating to a new environment
Changes in the decor or layout of their environment
The removal of objects they regard as important
Shifts in their independence and self-sufficiency
Changes in treatment or medication
Arguments, discussions of contentious subjects, or reminders of their memory issues

Strategies for Managing Dementia Triggers
First and foremost, it’s critical to remember that dementia is not easy for the patient either, even if they don’t remember their experiences as a whole. They have plenty of reasons to be afraid, upset, sad, or confused, and none of that is necessarily anyone’s fault. Beyond that, due to how biochemistry works, it’s possible for feelings to linger even when memory does not.

In other words, managing triggers is as much about helping them be as comfortable as possible as it is about minimizing the stress and difficulty faced by the caregivers.

Prioritize predictability and familiarity. Stick to regular routines and schedules. Surround them with items and environments they’re well acquainted with.

Try to prepare them for any changes or surprises in advance. Tell them beforehand if they’re going somewhere, switching rooms, seeing someone new, or even just to remind them of their regular schedule.
Keep their environment calm. Limit volume, avoid bright lights, and reduce distractions.
Be gentle and calm when speaking and interacting with them. How you treat them, and how well they can anticipate what to expect from you, will have a big impact on their emotional state.
Help them to get comfortable and stay comfortable. Sleeping, eating, hygiene activities, managing pain—all are areas where they might need assistance. They may not always be able to fix it on their own, or even communicate what they need, so be proactive if necessary.
Offer reassurance and support. They may need gentle reminders or help remaining calm, but nobody likes to be told “calm down,” or “you already asked me that.”
Understand that it’s hard to adjust to life without independence and minimal control. While necessary for their health and safety, it will at times feel to them like they’re being “parented,” and it’s not a fun experience.
Be ready for them to feel distressed whenever an aspect of their care changes. As they decline in self-sufficiency, are restricted from certain activities, or have to endure new treatments.
Monitor closely for side effects with any medication they take, and especially when there are any changes to those prescriptions. Discuss any physical or behavioral changes with their doctor.
Help them fill their time with activities and entertainment that aren’t too taxi
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