Behavioral disorders in Alzheimer's disease: understanding and acting
Comprehensive guide for families and caregivers — mechanisms, types of disorders, intervention strategies, and resources to better support daily
Behavioral disorders affect between 70 and 90 % of people with Alzheimer's disease at some point in their journey. It is often these disorders — and not memory loss — that exhaust caregivers, hasten institutionalization, and generate the most distress in families. However, these disorders are neither random nor inevitable in their intensity: they have identifiable causes, recognizable triggers, and appropriate responses that make a real difference. This guide provides you with the tools to understand what is happening and to act effectively.
1. Understanding behavioral disorders in Alzheimer's disease
1.1 What behavioral disorders reveal about the disease
Alzheimer's disease is not just a memory disease. It progressively affects all brain functions, particularly the regions that regulate emotions, control impulses, organize perceptions, and manage communication. When these regions are impaired, the person can no longer process their environment as they did before. What they perceive, feel, and express fundamentally changes.
Behavioral disorders — referred to in medical literature as "behavioral and psychological symptoms of dementia" (BPSD) — are directly related to these neurological damages. They are not a sign that the person "wants" to be difficult or that they have changed character out of whim. They are the expression of a brain that is suffering and no longer has the resources to process reality in a normal way. This understanding is the starting point for any compassionate and effective support.
It is also important to understand that behavioral disorders fluctuate significantly depending on the stages of the disease, contexts, overall health status, quality of sleep, level of stimulation or boredom, and the quality of emotional relationships. Some disorders are more frequent in the early stages of the disease, while others appear in moderate or severe stages. This variability means that appropriate interventions can have a real impact — and that resignation is never the right response.
1.2 The main types of disorders encountered
Several major categories of behavioral disorders in Alzheimer's disease are classically distinguished. Agitation is the most common: it includes motor agitation (wandering, gesticulating, inability to stay still), verbal agitation (screaming, repeated complaints, calling out), and physical or verbal aggression towards those around. Agitation is never without reason: it almost always signals an unmet need, unexpressed pain, fear, confusion, or sensory overload.
Psychotic disorders — delusions and hallucinations — are present in 20 to 50 % of patients at a moderate stage. The most common delusion is the delusion of harm ("my things have been stolen"), often related to the inability to find forgotten objects and to understand what has happened. Visual hallucinations are more common than auditory hallucinations in Alzheimer's. These experiences are perceived as completely real by the person — directly denying them increases anxiety rather than reducing it.
Depression and anxiety are present in the majority of patients at different stages. Depression is often underdiagnosed in elderly demented individuals, as its symptoms (slowing down, withdrawal, sleep disturbances) are easily attributed to dementia itself. However, treated depression significantly improves quality of life and reduces the intensity of other behavioral disorders. Anxiety often manifests as hypervigilance, clinging to the caregiver, repetitive questioning, and intense distress in the face of new or unexpected situations.
Apathy — disinterest in activities, withdrawal, lack of initiative — is actually the most common disorder of all, often mistakenly confused with depression. Unlike depression, apathy does not necessarily accompany sadness. The apathetic person is not actively suffering — they are no longer present. Stimulating an apathetic person requires a different approach than that of a depressive person: it is about creating opportunities for activation rather than trying to improve mood.
Sleep-wake rhythm disorders deserve special mention as they have a direct impact on daytime behaviors and on caregiver exhaustion. Day-night reversal — the person sleeps during the day and is active at night — is one of the most common causes of institutionalization. Nocturnal wandering, screaming at night, and frequent awakenings are among the most disabling disorders for families. Targeted interventions on sleep (light therapy, daytime physical activity, structured bedtime rituals) can significantly improve the situation.
1.3 The ABC approach: analyze before acting
When faced with a behavioral disorder, the first mistake is to act in urgency without understanding what has happened. The ABC approach (Antecedent — Behavior — Consequence) is a simple and powerful analytical tool that any caregiving team and any family can use.
The Antecedent is what happened just before the disorder: the environment (noise, light, crowding), the ongoing activity, the care provided, the people present, the person's state (tired, in pain, after a difficult meal). Documenting the antecedents over several days almost always reveals patterns — certain times, certain contexts, certain people — that systematically trigger the disorders. The DYNSEO alert signal map is an excellent support for formalizing these observations and sharing them with the entire team.
The Behavior is the precise and neutral description of the disorder: not "he was aggressive" but "he hit the caregiver during the morning wash, for about 3 minutes, saying that it hurt him." This precision is essential to identify triggering factors and elements that cause the situation to escalate or resolve.
The Consequence is the response provided by those around and its effects: did the situation calm down? Worsen? How long did the episode last? The consequence informs about the effectiveness of the strategies used and allows for gradually building a repertoire of responses tailored to this specific patient, in this specific context.
💡 The essentials to remember about the causes of behavioral disorders
In the vast majority of cases, a behavioral disorder in a person with Alzheimer's disease signals one of the following five things: an undiagnosed or undertreated physical pain (the first underestimated cause); an unmet fundamental need (hunger, thirst, need to go to the bathroom, need for human contact); overstimulation or understimulation of the environment; inappropriate communication from those around; or an intercurrent medical cause (urinary infection, constipation, medication effect).
First and foremost, a sudden worsening of behavioral disorders must prompt a search for an acute medical cause — particularly a urinary infection, which is extremely common in elderly women and may manifest solely as behavioral disorders in individuals already demented.
2. Non-pharmacological intervention strategies
International recommendations on managing behavioral disorders in dementia are unanimous: non-pharmacological interventions should be tried first. Psychotropic medications (antipsychotics, benzodiazepines) have significant side effects in elderly demented individuals — increased falls, accelerated cognitive decline, excessive sedation — and their effectiveness on behavioral disorders is often limited. They should be reserved for severe and at-risk situations, within the framework of rigorous medical evaluation.
2.1 Adapting the environment to reduce triggers
The physical and sensory environment plays a decisive role in the behavioral disorders of individuals with Alzheimer's disease. An environment that is too noisy, too stimulating, too changeable, or conversely too dull and unstimulating directly generates behavioral disorders. Adapting the environment is often the most effective and least costly measure to implement.
Reducing noise is a major first lever. Unpredictable and intense noises — television constantly on at high volume, simultaneous conversations from several people, institutional alarms — regularly trigger agitation in individuals with Alzheimer's disease. Turning off the television during meals, reducing the number of people present during care, limiting distracting conversations: these simple adjustments often significantly reduce agitation. The DYNSEO sensory needs map allows for documenting the particular sensitivities of each person and adapting their environment accordingly.
Lighting also deserves special attention. Individuals with Alzheimer's disease often have difficulties with artificial light that is too intense or too weak, and frequently exhibit worsening behavioral disorders in the late afternoon (the "sundowning" phenomenon). Exposure to natural light in the morning, soft and constant light in living spaces, and avoiding harsh contrasts between lit and dark areas help reduce this phenomenon.
The organization of space should facilitate orientation and autonomy. Clear visual markers (illustrated signs on bathroom and bedroom doors), familiar objects that are easily visible, photos of loved ones in strategic locations — all of this reduces confusion, decreases anxiety, and gives the person the resources to navigate their environment with more confidence. Wandering itself, often viewed as problematic, can be welcomed positively when space allows it — creating a safe wandering circuit is far preferable to trying to force the person to sit down.
2.2 Adapting communication to defuse difficult situations
Communicating with a person with moderate to severe Alzheimer's disease requires fundamentally rethinking the way we relate. The usual rules of communication — arguing, explaining, correcting, convincing — are counterproductive and generate unnecessary conflicts. Several fundamental principles guide appropriate communication.
The first is to never contradict the false statements of a demented person, no matter how disturbing they may be. If a person says that their mother is alive when she has been deceased for fifty years, correcting them forces them to relive a loss that they can no longer remember — and brings them nothing beneficial. Entering their frame of reference, responding to the emotion rather than the content of their words ("Are you thinking of your mom? She seemed like a wonderful person"), and gently guiding towards another activity or topic is infinitely more effective.
The second principle is to always approach from the front, to calmly introduce oneself, to maintain a kind eye contact, and to use the person's name. The person with Alzheimer's perceives the emotional states of their interlocutors very finely — even when their verbal understanding is limited. A stressed, impatient, or distant caregiver generates a response of vigilance or defense. In contrast, a calm, warm, and smiling presence facilitates cooperation even in difficult moments.
Emotional validation is a technique formalized by geropsychologist Naomi Feil, which involves accepting and validating the emotions and subjective reality of the demented person, whatever it may be. Rather than trying to bring the person back to objective reality, we accompany them in their inner reality with empathy. This approach significantly reduces agitation and distress in individuals at moderate and severe stages.
DYNSEO Training: Behavioral Changes Related to the Disease
Certified online training (Qualiopi) for families and caregivers. Understand behavioral disorders, learn daily management strategies, and take care of oneself as a caregiver.
Access the training →2.3 Maintain Appropriate Stimulation and Meaningful Activities
Boredom and lack of stimulation are major and underestimated causes of agitation in elderly people with Alzheimer's disease. A person who has nothing to do, who is not engaged in an activity, who is simply "parked" in front of a television or in a common room without interaction — this person will develop agitation behaviors much more frequently than someone whose day is structured with activities suited to their abilities and interests.
The fundamental principle of adapted activities is to work with preserved skills, not against deficits. Procedural memory (automated know-how) is remarkably resilient in Alzheimer's disease — long after episodic memory is severely affected. A person who cannot remember what they ate an hour ago can still peel vegetables, fold laundry, clap their hands to a musical rhythm, or perform craft gestures they have practiced for decades. These activities provide a sense of competence, usefulness, and pleasure that directly reduces agitation.
Music deserves special mention. Neuroscience research has shown that the music processing system is one of the last to be affected in Alzheimer's disease. People who no longer recognize their loved ones can still react emotionally to music from their youth, sing the lyrics, and show visible and lasting relaxation after sessions of adapted music. Music therapy is now recognized as an effective non-drug approach to reduce agitation and improve quality of life in dementia.
The DYNSEO EDITH app is specifically designed to meet this need for adapted cognitive stimulation. Its activities — categories, associations, visual logic, memory recall — are calibrated to remain accessible at moderate stages of dementia, with an intuitive touch interface and a gentle progression that preserves the experience of competence. When used regularly, it helps occupy idle moments, maintain preserved functions, and reduce the anxiety of a person seeking to "do something".
3. Managing Crisis Situations
3.1 Recognizing Precursor Signs
The vast majority of episodes of intense agitation do not come out of nowhere. There is almost always a gradual build-up of tension that attentive caregivers can spot: a certain agitation in the gaze, bodily stiffness, an accelerating verbal flow, repeated attempts to get up, a refusal to make contact. These precursor signals are valuable because they open a window for preventive intervention — it is infinitely easier to defuse a budding tension than a crisis that has already developed.
Learning to recognize the precursor signals of a crisis for a specific person is a skill that develops with observation and time. Each person has their own alert patterns. Some become quieter, others more agitated. Some show physical signs (sweating, flushing), others behavioral signs (repeated manipulation of objects, attempts to flee). The DYNSEO Crisis Management Plan, initially designed for ASD profiles, is entirely applicable to the Alzheimer's context: it formalizes these precursor signals and appropriate responses in a shareable document among all stakeholders.
3.2 Intervening During a Crisis
When the crisis is already underway, several fundamental principles guide intervention. Staying calm is the first and most important — the emotional distress of the caregiver inevitably amplifies that of the person. If one feels that their own emotional regulation is compromised, it is better to step away briefly (if safety allows) and let another person intervene.
Never physically restrain is the second absolute rule, except in the case of proven immediate danger. Physical restraint is a form of violence that traumatizes, increases distrust, and reinforces oppositional behaviors. It is unacceptable under any circumstances as a usual behavioral management strategy.
During the crisis itself, reducing environmental stimuli (lowering the volume, removing other people, dimming the light if appropriate), maintaining a low and calm voice, offering a reassuring familiar object, and using touch if the person usually tolerates it — all of this helps reduce the intensity and duration of the episode. After the crisis, do not immediately attempt to explain or analyze with the person what happened: they usually do not remember and this approach would only generate additional shame or confusion.
3.3 Taking Care of the Caregiver After a Crisis
Episodes of intense agitation — particularly physical or verbal aggression — have a considerable emotional impact on caregivers. Guilt ("What did I do to cause this?"), sadness ("This is no longer the same person"), fear, helplessness, and sometimes anger — all these emotions are normal and legitimate. Denying or repressing them only exacerbates long-term exhaustion.
After a difficult episode, the caregiver needs time to regulate themselves. Identifying a trusted person to talk to, noting what happened in a tracking journal to objectify patterns, and — when episodes are frequent — consulting a professional (family doctor, psychologist, social worker) to assess the situation and consider strengthening support. The DYNSEO training dedicated to behavioral disorders for professionals provides tools for team debriefing and emotional management after an incident.
Evaluate cognitive functions with DYNSEO tests
DYNSEO cognitive tests allow for the objective assessment of memory and attention functions in the context of monitoring a person with Alzheimer's disease. Accessible online, free of charge, without registration.
4. Supporting the family over time
4.1 Understanding and overcoming guilt
Guilt is the most universally shared emotion among families of people with Alzheimer's disease. It takes multiple forms: guilt for not "doing enough," guilt in the face of negative thoughts that arise in difficult moments, guilt for considering institutionalization, guilt for feeling relief when the person sleeps or when one can step away. This guilt is paradoxically a sign of deep emotional commitment — but it is also a source of exhaustion that harms the quality of support.
Behavioral disorders particularly amplify this guilt. When your own parent hits you, insults you, or accuses you of stealing from them, it is almost impossible not to react emotionally. Intellectual understanding ("it's the disease, not him") does not always protect against emotional hurt ("but it's still me he's hitting"). Accepting these complex emotions without denying them is a necessary step to navigate through them without being overwhelmed.
Support groups for caregivers — in person or online — play an irreplaceable role in this regard. Sharing with people who are experiencing the same situation reduces isolation, normalizes difficult emotions, and provides practical strategies tested by peers. France Alzheimer, Mutual Aid Groups, and many local associations organize these speaking spaces that complement professional support.
4.2 Organizing coherent multidisciplinary support
Behavioral disorders in Alzheimer's disease almost always require a multidisciplinary response. General practitioner, neurologist or geriatrician, neuropsychologist, occupational therapist, speech therapist, nurse, nursing assistant, social service assistant — each brings specific expertise and a different perspective on the situation. Coordination among these different stakeholders is often the weak point of the system.
Simple liaison tools help ensure this coherence. A warning signals document shared among all stakeholders describes the behaviors to monitor, identified triggers, and effective strategies. An updated crisis management plan ensures that all team members respond consistently to the same situations. This coherence is itself therapeutic: the person with Alzheimer's benefits from a predictable environment where the responses of the adults around them do not vary according to the day's caregiver.
The regular coordination meeting — formal in institutions, informal but planned at home — allows for adjusting strategies based on developments, sharing each person's observations, and supporting caregivers who may become exhausted. The family caregiver must have a full place in this: their knowledge of the person before the disease, their habits, preferences, and life history is an invaluable resource that professionals do not possess.
4.3 Knowing when to consider respite or institutionalization
The question of institutionalization is one of the most painful that families must face. It is often precipitated not by the progression of the disease itself, but by the intensity of behavioral disorders — particularly nighttime episodes, physical aggression, dangerous wandering, or severe incontinence associated with agitation.
This decision is never an abandonment, contrary to what guilt may suggest. It often responds instead to a need of the person themselves: a structured professional environment, with trained and sufficient caregivers, can offer a quality of support that the exhausted family can no longer provide. It also allows the family relationship to transform: the caregiver is no longer the sole provider of care but can become the son, daughter, spouse — with all that implies in terms of affection and chosen presence rather than obligation.
Before reaching that point, respite services — day care, temporary accommodation, night aides — deserve to be used much earlier than most families do. These services are not capitulation: they are resources that allow for endurance over time, preserve the caregiver's health, and paradoxically enable the person to remain at home longer.
5. DYNSEO resources and tools for Alzheimer’s support
DYNSEO offers a comprehensive ecosystem of tools, applications, and training to support families and professionals in caring for people with Alzheimer's disease and other dementias. These resources revolve around three axes: cognitive assessment, tailored stimulation, and caregiver support.
In terms of assessment, DYNSEO cognitive tests allow for tracking the evolution of memory, attention, and executive functions over time. The memory test and the concentration test provide quick indicators that complement formal clinical evaluations. They do not replace a professional neuropsychological assessment but allow for regular monitoring accessible to all and warning signals in case of rapid deterioration.
In terms of stimulation, the SCARLETT application is the reference solution. Designed with healthcare professionals specialized in geriatrics and neuropsychology, it offers activities calibrated for moderate stages of dementia — neither too easy (boring) nor too difficult (leading to failure and anxiety). Its simple touch interface and systematic positive feedback are particularly suited for people with difficulties using new technologies. The flexibility of levels allows for tracking progress and maintaining relevant activity even as the disease progresses.
For individuals who have lost their speech or have severe expressive difficulties, the MY DICTIONARY application offers an augmentative communication system using pictograms that allows for maintaining a communicative link even when verbal language is greatly impaired. Expressing needs, preferences, emotions — even in a rudimentary way — reduces frustration and consequently several forms of agitation related to the inability to be understood.
📱 Application SCARLETT
Gentle cognitive stimulation for elderly people with Alzheimer's disease or Parkinson's. Adapted activities, intuitive interface, personalized progression.
Discover SCARLETT →📱 Application MY DICTIONARY
Augmentative communication through pictograms for aphasic or non-verbal people. Maintaining connection when words are lacking.
Discover MY DICTIONARY →🤖 DYNSEO AI Coach
Personalized support through artificial intelligence for caregivers — answers to questions, guidance to resources, daily support.
Discover the AI Coach →📱 Application CLINT
For adults in the early stages of dementia — adaptable cognitive stimulation that preserves autonomy and engagement for as long as possible.
Discover CLINT →In terms of support for caregivers, two Qualiopi certified training courses offered online at their own pace are aimed respectively at families and professionals. The training "Behavioral changes related to the disease — guide for relatives" provides families with a framework for understanding behavioral disorders and concrete strategies, accessible without prior medical training. The training "Behavioral disorders — methods and multidisciplinary coordination" is aimed at caregivers and addresses clinical assessment methods, intervention protocols, and team coordination.
💡 Practical advice: Create a "link file" for your loved one today — including their life story (career, hobbies, important habits), musical tastes, food preferences, people and situations that provide security, and identified triggers. This document, shared with each new professional, replaces weeks of observation and immediately improves the quality of support. DYNSEO offers free downloadable templates in its tool catalog.
6. Preventing caregiver burnout: a medical priority
Caregiver burnout — referred to as caregiver burn-out in the medical literature — is a recognized clinical reality whose consequences can be as serious as the illness itself. Caregivers of people with Alzheimer's disease have depression rates two to three times higher than the general population, weakened immunity, increased cardiovascular risks, and documented excess mortality. Taking care of the caregiver is not a luxury — it is a sine qua non condition for support to endure.
Behavioral disorders are precisely the factor that most often precipitates burnout. Being insulted, threatened, or hit by one's own parent generates cumulative trauma that many families minimize or deny. Interrupted nights, constant hyper-vigilance, the inability to plan anything in advance, increasing social isolation — all of this accumulates until support becomes unbearable. Recognizing these signs early, before collapse, is essential.
Signs of advanced burnout include increasing irritability towards the person being cared for, persistent negative thoughts, sadness or a difficult-to-name feeling of emptiness, concentration and memory difficulties in the caregiver themselves, sleep disorders independent of difficult nights with the loved one, and progressive social withdrawal. When several of these signs are present simultaneously for several weeks, consulting a doctor is urgent — not as a sign of weakness but as an act of responsibility towards oneself and towards the person being cared for.
6.1 Resources for caregiver support in France
The support network for family caregivers has significantly developed in France in recent years, although it remains insufficient in light of needs. France Alzheimer (www.francealzheimer.org) has a national helpline (0 811 112 112) and local delegations that organize support groups, training, and respite activities. The Support and Respite Platforms (PAR), funded by Regional Health Agencies, offer respite stays for caregivers, home activities, and daily living assistance.
Administratively, the Personalized Autonomy Allowance (APA) finances home help and can cover respite solutions. The caregiver's leave allows employees to take temporary time off to care for a loved one. The Departmental House for Disabled Persons (MDPH) can provide additional assistance depending on the situation. The social worker from the medico-social team is the ideal contact to review all available rights and assistance.
Online forums and groups — well-regulated — offer a form of support accessible at any time, particularly valuable for caregivers who cannot travel. Caution is still required to distinguish between supportive and reliable spaces and those where incorrect information circulates. The official forums of patient associations (France Alzheimer, France Parkinson) are safe entry points.
6.2 Maintaining a personal living space
One of the most common mistakes caregivers make is completely merging their existence with that of the person being cared for, gradually losing all personal, social, and emotional life outside of caregiving. This merging, as understandable as it may be emotionally, inevitably leads to total burnout. Maintaining regular personal activities — even modest, even brief — is not selfish: it is the oxygen that allows one to continue.
This involves accepting help from others, which is often the most difficult step. The belief that "no one can take care of them as well as I can" — common and partially true — leads to refusing necessary relief. Learning to prepare an effective handover, to trust professionals, and to let go during respite times are skills that can be learned and that transform the caregiving experience.
FAQ — Behavioral Disorders in Alzheimer's Disease
Are medications necessary to manage behavioral disorders in Alzheimer's?
Psychotropic medications (antipsychotics, anxiolytics) should not be used as a first-line treatment for behavioral disorders of dementia. All international recommendations (HAS in France, NICE in the UK) advise trying non-pharmacological interventions first for several weeks. Medications are reserved for severe situations with risk to the person or their surroundings, after a complete medical evaluation. Their side effects in elderly demented individuals are significant: increased risk of falls, excessive drowsiness, cardiovascular effects, and sometimes accelerated cognitive decline. When used, the duration should be as short as possible with regular re-evaluation.
How to manage frequent theft accusations from my loved one with Alzheimer's?
The delusion of harm — "someone has stolen my things" — is one of the most common delusions in Alzheimer's disease. It can be simply explained: the person does not remember where they put their belongings, and their brain fills this memory gap with an available explanation (someone took them). The effective response is never to defend oneself or argue — this will have no effect on the delusional conviction and will generate unnecessary conflict. It is better to address the underlying emotion ("you seem worried about not finding your things, let's look together"), offer help to search for the items, and calmly de-dramatize. Practically, identifying usual hiding spots, duplicating important items (keys, wallet), and creating very visible storage helps reduce the frequency of episodes.
My loved one becomes aggressive during bathing — what to do?
Bathing is one of the riskiest moments for episodes of agitation and aggression in Alzheimer's individuals. Several factors explain this: exposure of the body which can be experienced as a violation of privacy, unwanted physical contact, fear related to disorientation (not understanding what is happening), undiagnosed physical pain, or simply an inappropriate time. Concrete suggestions: adapt the bathing time to when the person is most available, clearly explain each action before doing it ("I am going to wash your face now"), maintain as much control as possible for the person over the actions they can still do alone, offer soothing music during the care, and if resistance is systematic, consult a doctor to look for underlying physical pain.
Is wandering dangerous and should it be stopped?
Wandering is one of the most stressful behaviors for caregivers, but it is not inherently dangerous or undesirable. It often responds to a real need — the need for movement, physical exercise, exploration, or an attempt to satisfy a need that the person can no longer express verbally. The goal is not to stop wandering but to secure it. Creating a safe wandering space (loop circuit, enclosed garden), equipping the person with a geolocation system, securing exits (discreet alarms on doors), and identifying times of day when wandering is more intense to suggest alternative activities are much more effective — and respectful — strategies than restraint or confinement.
Are behavioral disorders reversible?
Some behavioral disorders can be significantly improved, even reversed, with the right interventions. Notably: disorders related to an acute medical cause (infection, pain, undesirable medication effect) often disappear when the cause is treated; disorders related to an underlying depression improve with appropriate antidepressant treatment; disorders related to the environment (agitation in a context of sensory overload) disappear when the environment is adapted. Other disorders, directly related to the progression of brain lesions, are part of the disease trajectory and can only be alleviated rather than eliminated. In any case, well-conducted interventions improve the quality of life for the person and their caregivers — even if they do not "cure" the disorder.
