Perception of ordinarily non noxious stimuli as pain, is better known as
## **Core Concept**
The question tests the understanding of abnormal pain perception, specifically the phenomenon where non-painful stimuli are perceived as painful. This concept falls under the category of **neuropathic pain** and altered sensory processing.
## **Why the Correct Answer is Right**
Allodynia refers to the condition in which non-noxious stimuli are perceived as painful. This can occur due to various reasons such as nerve damage, inflammation, or central sensitization. The mechanism involves changes in the expression and function of various receptors and ion channels in nociceptive neurons, making them more responsive to stimuli that would not normally cause pain.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Hyperalgesia is an increased sensitivity to pain, where a stimulus that is normally painful is perceived as more painful than it should be. This is different from allodynia, where non-painful stimuli are perceived as painful.
- **Option B:** Hyperpathia is an abnormally exaggerated subjective response to a stimulus, especially a repetitive stimulus, as well as an increased threshold. While it involves an abnormal response to stimuli, it is not specifically characterized by the perception of non-noxious stimuli as painful.
- **Option D:** Dysesthesia refers to an unpleasant, abnormal sensation, which may be spontaneous or evoked. While it is a type of neuropathic pain, it does not specifically describe the perception of non-painful stimuli as pain.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that allodynia is often associated with neuropathic pain conditions such as **complex regional pain syndrome (CRPS)**, **neuropathic pain after nerve injury**, and **migraines**. Recognizing allodynia is crucial for diagnosing and managing these conditions effectively.
## **Correct Answer:** C. Allodynia