Hallucinations & Psychosis in Parkinson’s Disease
Hallucinations in Parkinson’s disease are a common but often misunderstood symptom. They are usually not a sign of mental illness, but instead related to changes in the brain and, in many cases, Parkinson’s medications. Understanding what is happening can reduce fear and help patients and caregivers respond safely and calmly.
What Are Hallucinations?
Hallucinations in Parkinson’s disease involve seeing, hearing, or sensing things that are not actually present. Visual hallucinations are the most common type. They may be mild at first and often occur in dim lighting or during times of fatigue.
What is Psychosis?
Psychosis in Parkinson’s disease refers to a group of symptoms that may include hallucinations and delusions (strong beliefs that are not based in reality).
Examples of delusions:
• Believing someone is stealing or hiding things
• Thinking a spouse is unfaithful when they are not
• Feeling like someone is watching or following themThese symptoms can range from mild to severe and may change over time.
Why They Occur
Hallucinations and psychosis in Parkinson’s can happen for several reasons:
• Changes in brain chemistry (dopamine imbalance)
• Side effects of Parkinson’s medications
• Vision problems or low lighting
• Fatigue or poor sleep
• Infections or sudden illness (like UTIs)
• Cognitive changes or dementia in later stages
Often, it is a combination of these factors, not just one cause.
Early Warning Signs
Symptoms often begin subtly before becoming more noticeable:
• Seeing shadows or movement that isn’t there
• Feeling a presence nearby
• Misinterpreting objects (coat looks like a person)
• Increased confusion in the evening
• Trouble distinguishing dreams from reality
Recognizing these early signs can help prevent worsening symptoms.
When to Seek Medical Help
Contact a healthcare provider if:
• Hallucinations become frequent or distressing
• The person begins believing things that are not real
• Behavior changes suddenly
• There is increased confusion or agitation
• Symptoms appear suddenly (possible infection or medication issue)
Do not stop medications suddenly without medical guidance.
What Helps
• Improve lighting, especially in the evening
• Reduce visual clutter in the environment
• Maintain regular sleep routines
• Stay calm and avoid arguing about what is real
• Keep a consistent medication schedule
• Report changes early to a doctor
Caregiver Tips
• Do not argue or try to “prove” the hallucination is not real
• Respond calmly and provide reassurance
• Gently redirect attention if needed
• Check for triggers (fatigue, lighting, illness)
• Watch for safety risks (wandering, fear, agitation)
• Document patterns to share with the doctor
If hallucinations cause fear, aggression, or unsafe behavior, seek medical help immediately. Sudden changes may indicate an infection or medical issue.
Related Topics
—Vision Changes vs Hallucinations
—Medication Side Effects
—Cognitive Changes in Parkinson's
© 2026 TooShaky
Disclaimer: This patient education resource was created by Dawn Howard, Parkinson’s Advocate & Neurological Health Educator, through TooShaky.org, to support individuals newly diagnosed with Parkinson’s disease. Content is informed by lived experience, patient education best practices, and information from established medical, nonprofit, and educational sources. Drafting, editing, and organizational support were assisted by ChatGPT (OpenAI) as a writing and language tool, under the direction and review of the author. Educational content and references are drawn from sources including, but not limited to: Parkinson’s Foundation, The Michael J. Fox Foundation for Parkinson’s Research, American Parkinson Disease Association (APDA), Davis Phinney Foundation, Mayo Clinic, Cleveland Clinic, PubMed, PMC PubMed Central, Peer-reviewed medical literature and clinical education resources. This material is provided for informational and educational purposes only and is not intended to replace individualized medical advice, diagnosis, or treatment. Patients should discuss all medical questions and care decisions with their healthcare provider. TooShaky.org does not provide medical care and does not establish a clinician–patient relationship.
