Yes, Parkinson's can cause hallucinations, and they are a known side effect
Hallucinations—seeing, hearing, or sensing things that are not there—happen in roughly one-quarter to one-half of people with Parkinson's disease. They are not a sign that you are losing your mind. They occur because Parkinson's affects the brain regions that process sensory information and distinguish between what is real and what is not. The hallucinations may come from the disease itself, from the medications used to treat it, or from a combination of both.
Hallucinations in Parkinson's are usually visual—seeing people, animals, or objects that do not exist. Some people hear voices or feel sensations on their skin. They often happen in the evening or at night, and they tend to become more common as the disease progresses. The important thing to know is that this is treatable, and your doctor has concrete steps to take.
Key Takeaways
- Hallucinations affect about one in four to one in two people with Parkinson's and result from how the disease changes the brain.
- Visual hallucinations—seeing people or animals that are not there—are the most common type, often occurring in the evening.
- Parkinson's medications, particularly dopamine agonists, can trigger or worsen hallucinations, and your doctor may adjust your dose or switch medications.
- Infections, sleep problems, and other medical conditions can bring on hallucinations suddenly, so your doctor will rule these out first.
- Tell your doctor about hallucinations as soon as they start, because early treatment prevents them from becoming more frequent or distressing.
How Parkinson's disease changes the brain to cause hallucinations
Parkinson's damages nerve cells that produce dopamine, a chemical messenger in the brain. But the disease also affects other brain systems that have nothing to do with dopamine—particularly the regions that process what you see and hear, and the regions that tell you whether something is real or imagined. When these systems malfunction, your brain can generate sensory experiences without any actual stimulus from the outside world.
The hallucinations often feel completely real to the person experiencing them. You might see a person standing in the corner of the room, or an animal on the floor, with the same clarity as if they were actually there. This is not a delusion (a false belief you hold despite evidence to the contrary). You may know the hallucination is not real even while you are seeing it, or you may become convinced it is real. Both responses are common and both are part of the disease.
Medications that can trigger or worsen hallucinations
The drugs used to treat Parkinson's motor symptoms—tremor, stiffness, and slowness—can increase the risk of hallucinations. Dopamine agonists (medications that mimic dopamine in the brain) carry the highest risk. These include pramipexole, ropinirole, and rotigotine. Levodopa, the most commonly prescribed Parkinson's medication, can also cause hallucinations, especially at higher doses.
If you start having hallucinations after beginning or increasing a Parkinson's medication, tell your neurologist right away. Your doctor may lower the dose, change the timing of when you take it, or switch you to a different medication altogether. Do not stop taking your medication on your own—stopping suddenly can make your motor symptoms worse and may cause other problems. Your neurologist will work with you to find a balance between controlling your movement symptoms and preventing hallucinations.
Other medical causes that can bring on hallucinations suddenly
Hallucinations can appear or get worse very quickly if something else is going on in your body. A urinary tract infection, pneumonia, or other infection can trigger hallucinations in people with Parkinson's, even if the infection is mild and you have no fever. Sleep deprivation, constipation, and dehydration can also bring them on. High fevers, certain medications (including some over-the-counter cold medicines), and surgery can all be culprits.
This is why your doctor will ask detailed questions about when the hallucinations started and what else has been happening in your life. If you recently started a new medication, had surgery, or have been sick, mention it. Your doctor may order blood tests or a urinalysis to rule out infection. Treating the underlying cause—the infection, the sleep problem, or the medication interaction—often stops the hallucinations without needing to change your Parkinson's treatment.
What hallucinations look like and when they happen
Most people with Parkinson's-related hallucinations see things rather than hear them. Common hallucinations include seeing people (often family members or strangers), animals (especially dogs or cats), or small objects. Some people see shadows moving across the wall or feel like someone is in the room with them. Hallucinations often happen in dim light or darkness, which is why they are more common in the evening and at night.
Hallucinations may last a few seconds or several minutes. They can happen once a week or many times a day. Some people have them only when they are tired or stressed. Others notice they happen at a particular time of day or in a particular room. Keeping track of when and where your hallucinations occur can help your doctor figure out what is causing them and how to treat them.
How your doctor will assess and treat hallucinations
Start by telling your neurologist or primary care doctor about the hallucinations. Describe what you see or hear, when it happens, how long it lasts, and whether you know it is not real. Your doctor will review all your medications (including over-the-counter drugs and supplements), ask about recent infections or illnesses, and check your sleep and diet. They may order blood tests or other tests to rule out infection or other medical problems.
If the hallucinations are caused by your Parkinson's medication, your doctor's first step is usually to adjust the dose or timing. If that does not work, they may prescribe an additional medication to treat the hallucinations. Pimavanserin is an FDA-approved medication specifically for hallucinations and delusions in Parkinson's. Other medications like quetiapine or clozapine may be used, though these carry their own risks and require careful monitoring. Your doctor will discuss the benefits and side effects of each option with you.
What you can do at home to reduce hallucinations
While you work with your doctor on medical treatment, several practical steps may help. Keep your home well-lit, especially in the evening, because hallucinations are less likely in bright light. Maintain a regular sleep schedule and aim for seven to eight hours of sleep per night—fatigue makes hallucinations worse. Stay hydrated and eat regular meals, because dehydration and low blood sugar can trigger them.
If you have a hallucination, stay calm. Remind yourself that it is not real, even if it feels real. Do not argue with the hallucination or try to fight it. If you live with family or a caregiver, let them know what you are experiencing so they can help reassure you and keep you safe. Some people find it helpful to turn on a light, move to a different room, or engage in an activity like listening to music or talking to someone. These actions can help the hallucination fade.
Frequently Asked Questions
Do hallucinations mean my Parkinson's is getting worse?
Hallucinations are more common as Parkinson's progresses, but they are not inevitable and do not mean your disease is advancing faster than expected. They can appear at any stage and are often triggered by medication changes or other medical problems rather than by the disease itself. Your doctor can treat them without changing your overall Parkinson's care plan.
Will I always have hallucinations once they start?
No. Many people have hallucinations for a period of time and then stop, especially if the cause is a medication adjustment or a treatable infection. Others have them on and off throughout their disease. With proper treatment, hallucinations can be reduced or eliminated entirely, though it may take some trial and adjustment to find what works for you.
Can hallucinations be dangerous?
Most hallucinations in Parkinson's are not dangerous because people usually know they are not real. However, if a hallucination causes you to move suddenly or lose your balance, there is a risk of falling. If you live alone, let a family member or friend know about your hallucinations so they can check on you. If a hallucination ever causes you to feel unsafe or act in ways that worry you, contact your doctor immediately.
What if my doctor's first treatment does not work?
Finding the right treatment often takes time and adjustment. If lowering your medication dose does not stop the hallucinations, your doctor may try a different dose or timing, switch to a different Parkinson's medication, or add a medication specifically for hallucinations. Be patient and communicate clearly with your doctor about what is and is not working. It usually takes several weeks to see the full effect of a change.
Should I tell my family about hallucinations?
Yes. Letting family members or caregivers know what you are experiencing helps them understand what is happening and support you. They can help keep you safe, reassure you during a hallucination, and provide important information to your doctor about when and how often they occur. You do not need to feel embarrassed—hallucinations are a known part of Parkinson's disease.