Yes, people with Parkinson’s disease often experience hallucinations. While this can be scary to witness, as long as they aren’t disruptive or upsetting to the person, hallucinations are usually harmless. Hallucinations are often due to an underlying cause that can be treated, such as an infection or a side effect of medication. If a loved one with Parkinson’s disease is prone to hallucinations, try to create a calm, quiet environment with a comfortable temperature and not too much or too little light. You should acknowledge the hallucination, keep the person calm, and try to change the subject.