A patient reports feeling as though something is crawling on their skin, causing intense itching. Despite thorough assessment, the nurse finds no physical abnormalities or external stimuli responsible for the sensation. This phenomenon is classified as which type of hallucination?

1. A

   Visual hallucination

2. B

   Auditory hallucination

3. C

   Gustatory hallucination

4. D

   Tactile hallucination

Appeared in: NORCET-7 Mains-2024

Explanation

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• Tactile hallucinations are false perceptions involving the sense of touch.
• The specific sensation described, feeling like something is crawling on the skin, is a classic example known as formication.
• The nurse's assessment ruled out any actual physical cause (like insects or a rash), confirming the experience is a hallucination and not an illusion or a real infestation.

Why Other Options Were Wrong

• Option A: This is incorrect because a visual hallucination involves the sense of sight, such as seeing things that are not actually present.
• Option B: This is incorrect as an auditory hallucination involves the sense of hearing, like hearing voices or sounds without an external source.
• Option C: This is incorrect because a gustatory hallucination relates to the sense of taste, such as experiencing tastes without anything in the mouth.

Related Visual

• Visual 1: Infographic: A chart classifying the five main types of hallucinations (Auditory, Visual, Tactile, Gustatory, Olfactory) with a clear icon and a simple example for each, such as 'Feeling bugs on skin' for Tactile.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Types of Hallucinations to guide bedside assessment, documentation, and the next nursing action.
• Recognizing formication is crucial as it is a common symptom of delirium tremens (severe alcohol withdrawal) and stimulant abuse (e.g., cocaine, methamphetamine).
• The nurse's priority is to ensure patient safety, as these hallucinations can be very distressing, and to assess for the underlying cause, which may be a medical emergency.
• What if? If the patient reported both feeling and seeing the bugs on their skin, this would be a combined tactile and visual hallucination, often indicating a more severe delirium or toxic state.

How to Approach the Question

• First, identify the core symptom described in the scenario: a sensation of 'something crawling on their skin'.
• Next, determine which of the five senses this sensation relates to. In this case, it is the sense of touch.
• Note the critical information that there are 'no physical abnormalities,' which rules out a real cause and points towards a hallucination.
• Finally, match the sensory domain (touch) with the corresponding medical term from the options. 'Tactile' directly relates to the sense of touch.

Concept Tested & Keywords

• Concept Tested: Types of Hallucinations
• Stem keywords: crawling on their skin, intense itching, no physical abnormalities, sensation
• Lead-in keywords: classified as which type
• Clinical cues: The sensation of crawling on the skin (formication) without a physical cause is a hallmark symptom of a tactile hallucination.

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