Understanding Dementia Behaviors: What to Do

If you’re caring for someone with Alzheimer’s disease or another form of dementia, you’ve likely encountered behaviors that confused, frightened, or frustrated you. A parent who was gentle and warm now says cruel things. Someone who knew their way around the neighborhood gets lost two blocks from home. The person who slept well for decades is now agitated every evening at dusk.

These behaviors are symptoms, expressions of what’s happening in the brain. They’re not willful. They’re not aimed at you personally. And understanding what’s driving them makes it possible to respond more effectively, and to protect your own sanity.

First: What Dementia Actually Does to the Brain

Dementia (Alzheimer’s is the most common type) progressively destroys brain cells. The damage affects memory first, then reasoning, then language, then the ability to perform basic tasks, then personality and behavior regulation.

The behaviors that often distress caregivers most (aggression, paranoia, delusions, wandering) typically emerge in the middle and late stages, when damage has spread to brain regions that regulate emotion, impulse control, and reality testing.

Your person is not choosing to behave this way. Their brain is not functioning the way it once did.

Common Dementia Behaviors and What Helps

Agitation and Aggression

What’s happening: Agitation (restlessness, anxiety, repetitive movements or speech) and aggression (verbal or physical) are among the most challenging and common dementia behaviors. They’re usually expressions of unmet needs or distress, not random.

Common triggers:

• Pain or physical discomfort (that the person can’t clearly communicate)
• Fear (from not understanding what’s happening or who you are)
• Being rushed, startled, or touched unexpectedly
• Overstimulation (too much noise, activity, people)
• Hunger, thirst, a full bladder
• A change in routine
• Fatigue

What helps:

• Check for physical causes first: pain, constipation, infection, medication side effects
• Approach calmly, from the front, at eye level. Never sneak up.
• Use a calm, slow, reassuring tone
• Simplify the environment; reduce noise and activity
• Offer a distraction or change of scene
• Don’t argue, reason, or try to convince. It doesn’t work and escalates things.
• If you’re asked about something that isn’t true (“Where is my mother?”), enter their reality rather than correcting it

Sundowning

What’s happening: Sundowning refers to increased confusion, agitation, or distress in the late afternoon and evening. It’s common in Alzheimer’s and other dementias and is thought to be related to disruptions in the internal body clock, according to research published in the American Journal of Psychiatry.

What helps:

• Keep the late afternoon as calm and consistent as possible
• Use bright lighting during the day (which helps regulate circadian rhythms)
• Limit napping during the day
• Keep evenings calm, predictable, low-stimulation
• A light snack in the late afternoon can help
• Familiar music, simple activities, or a calming walk sometimes help

If sundowning is severe and affecting quality of life for everyone, talk to the doctor. There are sometimes medications that help.

Wandering

What’s happening: People with dementia may wander, walking away from home or a care setting, often without awareness of where they’re going or why. Wandering can be extremely dangerous.

What helps (prevention):

• Supervised outdoor time and regular exercise can reduce the urge to wander
• Door alarms and door covers that blend into walls can discourage door use
• ID bracelets or GPS tracking devices (the Alzheimer’s Association’s Safe Return program is one option)
• Tell neighbors to let you know if they see your person alone outside
• Remove visible cues that trigger leaving (coat hung by the door, keys in sight)

If they wander: Stay calm. Don’t block or grab. Approach from the front, use their name, offer to walk with them. Have a response plan in place before it happens.

Repetitive Questions or Behaviors

What’s happening: Short-term memory loss means the person doesn’t retain that they just asked a question or did something. Each time feels like the first time.

What helps:

• Answer with calm patience, as if it’s the first time. Because for them, it is.
• Recognize that the feeling behind the question is often the real issue (“Are we going home?” often means “I’m scared or confused”)
• Address the feeling: “You’re safe. We’re together.”
• Simple, consistent answers
• Distraction can help redirect

Paranoia and False Accusations

What’s happening: As the brain’s ability to process reality diminishes, paranoid beliefs can emerge: someone is stealing from them, their family is plotting against them, a spouse is having an affair. These feel completely real to the person experiencing them.

What helps:

• Don’t argue or try to disprove the belief
• Acknowledge the feeling: “I can see you’re really upset. I’m not going to steal from you.”
• Distract and redirect when possible
• If accusations are directed at you consistently, consider involving another caregiver. Sometimes paranoia is less triggered by a different face.
• Secure valuable items that are likely to “go missing” to reduce triggers

Difficulty Recognizing Family Members

What’s happening: In later stages, people with dementia may not recognize family members, including spouses and children. This is one of the most painful parts of the disease for families.

What helps:

• Don’t insist they recognize you. This often causes distress.
• Introduce yourself by name and relationship each time if needed
• Focus on the emotional connection rather than the factual one: they may not know you’re their child but may feel comforted by your presence
• Allow yourself to grieve this. It’s a real and significant loss.

When Behaviors Escalate

If behaviors change dramatically or suddenly, this can be a medical emergency. Sudden behavior changes in dementia patients are often caused by:

• Urinary tract infections (UTIs) (extremely common; a systematic review published in NIH’s PubMed Central confirms they frequently cause sudden confusion and agitation in elderly people)
• Medication changes or medication errors
• Dehydration
• Pneumonia or other infections
• Stroke

Call the doctor if behaviors change sharply and unexpectedly, even if there’s no obvious physical complaint.

Getting Support

Caring for someone with dementia is one of the most demanding forms of caregiving. You need support that goes beyond general caregiver resources:

• Alzheimer’s Association Helpline: 1-800-272-3900, 24/7, staffed by specialists
• ALZConnected: Online community for dementia caregivers
• The 36-Hour Day by Nancy Mace and Peter Rabins (Johns Hopkins University Press): A book that many dementia caregivers call essential, with practical guidance on managing every stage
• Dementia-specific caregiver support groups through your local AAA or the Alzheimer’s Association
• Our guides on mental health resources for caregivers and finding respite care are specifically relevant here. Dementia caregivers report some of the highest burnout rates of any care situation.

Next step: Read our guide on Home Safety Checklist for Aging Parents to make sure the environment is as safe as possible.