Hallucination (patient information)

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What are the causes?

When to seek urgent medical care?


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Editor-in-Chief: C. Michael Gibson, M.S.,M.D. [1] Phone:617-632-7753; Associate Editor-In-Chief: Lakshmi Gopalakrishnan, M.B.B.S.


Hallucinations involve sensing things while awake that appear to be real, but instead have been created by the mind.


  • Common hallucinations include:
  • Feeling bodily sensations, such as a crawling feeling on the skin or the movement of internal organs
  • Hearing sounds, such as music, footsteps, windows or doors banging
  • Hearing voices when no one has spoken (the most common type of hallucination). These voices may be critical, complimentary, neutral, or may command someone to do something that may cause harm to themselves or to others.
  • Seeing patterns, lights, beings, or objects that aren't there
  • Smelling a foul or pleasant odor
  • In some cases, hallucinations may be normal. For example, hearing the voice of, or briefly seeing, a loved one who has recently died can be a part of the grieving process.

What causes Hallucination?

There are many causes of hallucinations, including:

When to seek urgent medical care?

  • A person who begins to hallucinate and is detached from reality should get checked by a health care professional right away. Many medical and psychiatric conditions that can cause hallucinations may quickly become emergencies.
  • A person who begins to hallucinate may become nervous, paranoid, and frightened, and should not be left alone.
  • Call your health care provider, go to the emergency room, or call the local emergency number (such as 911) if someone appears to be hallucinating and is unable to tell hallucinations from reality.


  • Your health care provider will do a physical examination and take a medical history. Blood may be drawn for testing.
  • Medical history questions may include the following:
  • How long have the hallucinations been occurring?
  • Do the hallucinations occur just before or just after sleep?
  • Has there been a recent death or other emotional event?
  • What medications are being taken?
  • Has alcohol been used?
  • Are illegal drugs being used?
  • Is there agitation?
  • Is there confusion?
  • Is there a fever?
  • Is there a headache?
  • Is there vomiting?



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