Two of the most common behaviors caused by Alzheimer’s disease are agitation (including aggression) and apathy. But these are far from the only ones. Around 90% of people with Alzheimer’s experience at least one behavioral or psychological symptom over the course of the disease, and most develop several. Understanding what drives these behaviors, and what they look like day to day, can help caregivers respond more effectively.
Agitation and Aggression
Agitation and aggression affect roughly 27% of people with Alzheimer’s living in the community at any given time, making them among the most common and most distressing behavioral changes. Agitation can look like pacing, restlessness, yelling, or refusing care. Aggression may involve hitting, pushing, or verbal outbursts directed at caregivers or family members. These behaviors often seem to come out of nowhere, but they typically have a trigger, even if it isn’t obvious.
Inside the brain, Alzheimer’s disrupts the balance between regions that regulate emotion and impulse control. The prefrontal cortex, which normally keeps emotional reactions in check, loses its ability to communicate effectively with deeper brain structures involved in fear and arousal. At the same time, chemical messenger systems shift: stress-related signaling becomes overactive while serotonin, the chemical that helps stabilize mood, drops. This combination means the brain is simultaneously more reactive and less able to regulate that reaction.
Common triggers include overstimulation, pain the person can’t articulate, unfamiliar environments, changes in routine, or feeling rushed during personal care tasks like bathing. Because people with Alzheimer’s progressively lose the ability to express discomfort in words, agitation often becomes a form of communication. Paying attention to what happened in the minutes before an episode can reveal patterns over time.
Apathy and Withdrawal
Apathy is actually the single most common behavioral symptom in Alzheimer’s, affecting about 32% of community-dwelling patients. It’s also one of the most overlooked, partly because it doesn’t create the same caregiving crises that aggression does. A person with apathy loses motivation and interest in activities they once enjoyed. They may stop initiating conversations, show little emotional response to news, or sit passively for long stretches without engaging.
This isn’t laziness or depression, though the two can overlap. Apathy in Alzheimer’s stems from damage to the brain’s motivation and reward circuits. The person isn’t choosing to disengage; the internal drive that normally pushes someone to start an activity or pursue a goal is simply no longer functioning the way it should. Depression, which affects about 29% of Alzheimer’s patients, involves sadness or hopelessness. Apathy can exist without any sadness at all.
For caregivers, apathy can be quietly exhausting. Trying to engage someone who shows no interest in anything takes enormous emotional energy. Structured routines, gentle prompting, and activities tied to long-term memories (like playing familiar music or looking through old photographs) can sometimes spark engagement, even briefly.
Other Behaviors That Frequently Appear
Beyond agitation and apathy, several other behavioral changes are common enough that most caregivers will encounter them.
Repetitive questioning and actions. Asking the same question over and over, often about upcoming events or the time of day, is one of the hallmark behaviors of Alzheimer’s. It’s partly driven by memory loss: the person genuinely doesn’t remember asking. But research shows memory alone doesn’t explain it. Anxiety, difficulty sequencing actions (knowing what comes next), and reduced executive function all contribute. The questions themselves often reflect an underlying worry, like concern about being left alone or confusion about what’s happening later in the day.
Wandering. People with Alzheimer’s may leave home without a clear destination, get lost in familiar places, or pace repeatedly through rooms. This behavior is linked to damage in brain areas responsible for spatial awareness and topographical memory, essentially the internal map that tells you where you are and how to get where you’re going. It tends to appear when cognitive impairment reaches a moderate to severe level. Wandering is one of the most dangerous Alzheimer’s behaviors because it can lead to falls, exposure to weather, or getting lost.
Sundowning. Many people with Alzheimer’s experience a worsening of symptoms in the late afternoon and evening. This pattern, called sundowning, typically involves increased agitation, anxiety, confusion, or even hallucinations as daylight fades. It may also trigger wandering. The exact cause isn’t fully understood, but disruption to the body’s internal clock plays a role. Keeping rooms well-lit in the evening and maintaining a calm, predictable routine during those hours can help reduce the intensity.
What Helps Manage These Behaviors
Non-drug approaches are the first line of response for most Alzheimer’s-related behaviors, and several have solid evidence behind them. Reality orientation training uses repeated cues like large calendars, clocks, labeled rooms, and regular reminders of basic information to help reduce confusion and disorientation. Validation therapy focuses on accepting the person’s emotional reality rather than correcting them, creating a sense of safety that can defuse agitation. Reminiscence therapy, where caregivers encourage the person to talk about familiar topics from their past like their hometown or career, has been shown to modestly improve mood and mental engagement.
Physical exercise programs help people with Alzheimer’s maintain mobility longer and can reduce restlessness. Even simple activities like guided walks or seated stretching count. Consistent daily routines, reduced noise and clutter, and predictable mealtimes all lower the background level of confusion that fuels many behavioral symptoms.
For wandering specifically, practical safety measures matter. GPS tracking devices, medical ID bracelets, locked doors with alarms, and signs reading “STOP” or “DO NOT ENTER” on exit doors can prevent dangerous situations. Keeping shoes, keys, and coats out of sight removes visual cues that might prompt someone to leave. Alerting neighbors and local police that a household member tends to wander creates an additional safety net. The MedicAlert and Alzheimer’s Association Safe and Found program offers a formal tracking and return service.
When behavioral symptoms are severe, particularly agitation and aggression that don’t respond to environmental changes, medication may be considered. In 2023, the FDA approved the first drug specifically indicated for agitation associated with Alzheimer’s dementia, a milestone after decades of relying on off-label prescribing. That said, medication works best alongside the non-drug strategies rather than replacing them.