Hallucinations affect roughly 18% of people with Alzheimer’s disease, up to 50% of those with Parkinson’s disease dementia, and as many as 75% of people with Lewy body dementia. If your loved one is seeing, hearing, or feeling things that aren’t there, your instinct may be to correct them or talk them out of it. That approach almost always backfires. What works is a combination of staying calm, adjusting the environment, and knowing when something medical needs attention.
Hallucinations, Delusions, and Illusions Are Different
Before you can respond effectively, it helps to know exactly what you’re dealing with. These three experiences look similar from the outside but call for slightly different responses.
Hallucinations mean the person perceives something with no external trigger at all. They might see children sitting in the living room, hear voices, or feel strings in their mouth. Their brain is generating the experience from scratch. Illusions happen when a real object gets misinterpreted. A coat rack becomes a person standing in the corner, or a shadow on the floor looks like a hole. Delusions are fixed false beliefs: the person is convinced someone is stealing from them, or that a spouse has been replaced by an imposter (a phenomenon called Capgras syndrome).
Illusions are often the easiest to address because you can change the physical object causing the confusion. Hallucinations and delusions require a different toolkit, focused on emotional reassurance rather than logic.
Rule Out a Medical Cause First
A sudden spike in confusion, hallucinations, or behavioral changes in someone with dementia is not always the dementia getting worse. It can signal delirium, a temporary but serious condition triggered by an underlying medical problem. Urinary tract infections are one of the most common culprits. An infection in the bladder releases inflammatory signals into the bloodstream that can cross into the brain and disrupt normal function. Research from Cedars-Sinai has shown that one specific inflammatory protein released during a UTI can directly cause changes in brain activity.
The key distinction: dementia does not cause abrupt declines. If someone who was relatively stable yesterday is suddenly much more confused, less alert, or behaving very differently today, think delirium first. Watch for changes in urination patterns, new incontinence, pain, or changes in urine color or odor. Dehydration, other infections, new medications, and constipation can also trigger delirium. Treating the underlying cause often resolves the hallucinations entirely.
How to Respond in the Moment
The single most important rule: do not argue about what the person sees or hears. You will not convince them the hallucination isn’t real, and trying to do so increases their distress and yours. Their brain is producing a genuine sensory experience. Telling them it’s not real feels, to them, like being told they’re crazy.
Instead, respond to the emotion behind the experience. If your mother says she sees her own mother (who died years ago), saying “You must really miss your mother” acknowledges what she’s feeling without reinforcing or denying the hallucination. This is the core of validation therapy: you validate the emotion, not the content. Ask gentle follow-up questions that let the person process their feelings. What did her mother’s cooking smell like? What did she look like when she dressed up? Engaging the senses through memory can redirect the conversation naturally.
When the hallucination is frightening rather than comforting, shift strategies. Comfort the person first, let them know they are safe, and then try distraction. Moving to another room or going outside for a walk changes the sensory input enough to break the cycle. Physical reassurance, like holding a hand or a gentle hug, communicates safety in a way words sometimes can’t.
What Not to Do
- Don’t quiz or correct. Saying “There’s nobody there” creates conflict without resolving anything.
- Don’t react with visible alarm. Take a deep breath and slow yourself down before responding. Your calm becomes their calm.
- Don’t take accusations personally. If paranoia accompanies the hallucinations and you get blamed for stealing something, let it pass. Keep extra sets of commonly “stolen” items like keys and eyeglasses on hand.
- Don’t leave upsetting TV on. Someone with dementia may believe violent or dramatic scenes on television are happening in the room.
Environmental Changes That Reduce Hallucinations
Many hallucinations and illusions are triggered or worsened by the physical environment. Adjusting lighting, patterns, and reflective surfaces can reduce episodes significantly, sometimes eliminating certain types of illusions altogether.
Lighting is the single biggest factor. Dim rooms, harsh shadows, and glare all increase the chance of visual misperceptions. Aim for bright, even lighting throughout the home, especially on stairs and in bathrooms. Open curtains during the day, trim hedges or trees that block natural light, and remove unnecessary window coverings. At night, automatic motion-sensor lights prevent the disorientation that comes with waking in darkness. Close curtains in the evening so the person doesn’t see their own reflection in window glass and mistake it for a stranger.
Mirrors are a common trigger. A person with moderate or advanced dementia may not recognize their own reflection and become frightened or agitated by what they perceive as an intruder. Cover or remove mirrors that cause distress.
Bold patterns and stripes on floors, walls, or furniture can be confusing and disorienting. A dark rug on a light floor might look like a hole. Busy wallpaper can produce visual distortions. Simplify the visual environment wherever possible, favoring solid, contrasting colors that help the person distinguish surfaces and objects clearly.
When Medication Becomes Necessary
Medication is generally reserved for situations where hallucinations cause significant distress or put the person (or others) at risk of harm, and non-drug approaches haven’t been enough. The decision isn’t straightforward because antipsychotic medications carry serious risks in older adults with dementia, including increased risk of stroke and higher mortality. Regulatory agencies in the US, UK, and Europe have issued warnings about these risks.
For Parkinson’s disease psychosis specifically, one medication (pimavanserin) is FDA-approved to treat hallucinations and delusions. It works differently from older antipsychotics and doesn’t worsen the movement symptoms of Parkinson’s. It is not approved for hallucinations caused by Alzheimer’s, Lewy body dementia, or other non-Parkinson’s dementias. Low-dose quetiapine is sometimes tried for Parkinson’s-related psychosis as well, though clinical trials have found it performs no better than placebo.
For other types of dementia, medication choices are more limited and the risk-benefit calculation is more difficult. Any conversation about antipsychotics should include a frank discussion with the prescribing doctor about the specific risks, the expected benefit, and a plan to reassess regularly. These medications are meant to be used at the lowest effective dose for the shortest possible time.
Protecting Yourself as a Caregiver
Watching someone you love interact with a reality you can’t see is exhausting and isolating. It can feel like you’re losing them in a new way each time it happens. The emotional toll is real, and it compounds over months and years.
Practically, make sure the person’s environment is safe. Remove or secure anything they could use to hurt themselves or someone else during an episode of agitation. Keep pathways clear to prevent falls. If wandering is a concern, door alarms and GPS trackers provide a layer of security.
Explain the situation to other family members and visitors so they know what to expect and how to respond. When people understand that accusations, paranoia, or strange statements are symptoms of a disease, they’re less likely to react in ways that escalate the situation.
Depression and suicidal thoughts are common in early dementia, particularly when the person still has enough awareness to understand what’s happening to them. Elderly men are at especially high risk. If your loved one expresses hopelessness or mentions not wanting to be alive, take it seriously.
For your own wellbeing, caregiver support organizations offer both practical guidance and emotional connection with others in similar situations. The Alzheimer’s Association helpline (800-272-3900) is available around the clock. The Family Caregiver Alliance (800-445-8106) and the Caregiver Action Network provide resources tailored to family members. The NIA’s ADEAR Center (800-438-4380) can connect you with local services and research updates. You do not have to figure this out alone, and reaching out is not a sign of failure.