Magnan’s symptom is ?
**Core Concept**
Magnan's symptom refers to the tactile hallucination of feeling insects or worms crawling under the skin, a classic symptom of delirium tremens or other forms of substance withdrawal.
**Why the Correct Answer is Right**
Magnan's symptom is a type of formication, which is a tactile hallucination caused by altered neurotransmitter activity in the brain. This can occur in conditions such as delirium tremens, withdrawal from substances like cocaine or heroin, or in cases of severe anxiety or depression. The exact mechanism is not fully understood, but it is thought to involve changes in dopamine and serotonin levels, as well as abnormal activity in the brain's sensory processing centers.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically describe the tactile hallucination of feeling insects or worms crawling under the skin.
**Option B:** This option is incorrect because it refers to a different symptom, such as tremors or muscle spasms, which are not characteristic of Magnan's symptom.
**Option C:** This option is incorrect because it describes a different type of hallucination, such as visual or auditory hallucinations, which are not specific to Magnan's symptom.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Magnan's symptom is a classic sign of delirium tremens, and its presence should prompt further evaluation for substance withdrawal or other underlying medical conditions.
**Correct Answer: D. Tactile hallucination of feeling insects or worms crawling under the skin.**