Study Finds Body Processes Facial Itches Differently Than Body Itches
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A new study reveals that itch signals from the face and the rest of the body travel to the brain via distinct neural pathways. The face sends itch and pain signals simultaneously, which may explain why facial itching is perceived differently.
Facts First
- Itch signals from the face and body travel different routes to the brain.
- Facial itching begins at the trigeminal ganglia (TG) while body itching starts at the dorsal root ganglia (DRG).
- The face sends itch and pain signals simultaneously, unlike the rest of the body.
- Pain often overrides itch sensations on the face, potentially reducing perceived itch intensity.
- Applying histamine to the cheek caused less itching than applying it to the neck.
What Happened
A study from North Carolina State University (NC State) found that the body processes itch signals from the face differently than those from the rest of the body. Itch signals travel to the brain via two distinct routes: an itch on the arm begins with skin irritation and travels through the dorsal root ganglia (DRG), the spinal cord, and then to the brain. An itch on the face travels from the irritation spot to the trigeminal ganglia (TG) and then directly to the brain.
Why this Matters to You
This discovery may help explain why itching sensations can feel different depending on where they occur on your body. For instance, when histamine, an itch-inducing substance, was applied in the study, the cheek itched less than the neck, despite the cheek having more nerves. This could lead to more targeted treatments for chronic itching conditions, as understanding the separate pathways might allow researchers to develop therapies that are more effective for facial versus body itching.
What's Next
The distinct neural pathways identified could become a focus for future research into itch and pain management. Scientists may investigate how the simultaneous sending of itch and pain signals from the face affects treatment responses, potentially leading to new approaches for conditions like eczema or psoriasis that affect different parts of the body.