What Causes Pruritus Itchy Skin Sensation
“You feel an irritating, tingling sensation that forces you to scratch your skin immediately! Why does this annoying feeling happen? This unpleasant sensation is called PRURITUS. It occurs when specialized nerve fibers in your skin send a distress signal to your brain. Histamines or external irritants trigger these C-fiber receptors. This physical response supports your body's defense against potential parasites or harmful toxins. Do you have an itch right now just by watching this? Drop a 'YES' in the comments and hit SUBSCRIBE!”
Summary
Pruritus is the unpleasant, tingling sensation that compels scratching and is defined as an urge to scratch. It is transmitted by unmyelinated C‑fibers (and some thinly myelinated Aδ fibers) that are activated by histamine and other pruritogenic substances. This itch response serves as a protective mechanism, alerting the body to potential parasites, toxins, or other irritants.
Sources 59 searched
- Basic Mechanisms of Itch - PMC - NIH
More than one sensory nerve subtype is thought to subserve pruriceptive itch which includes both unmyelinated C-fibers and thinly myelinated Aδ nerve fibers. There are a myriad of mediators capable of stimulating these afferent nerves leading to itch, including biogenic amines, proteases, cytokines, and peptides. Some of these mediators can also evoke sensations of pain and the sensory processing underlying both sensations overlaps in complex ways. Studies have demonstrated that both peripheral and central sensitization to pruritogenic stimuli occur during chronic itch. Itch, or pruritus, can be defined as an unpleasant sensation that evokes the desire to scratch.
- Pruritus in certain internal diseases - PMC - NIH
Pruritus may be acute or chronic, localized or generalized3, 4. It has been a long time since the general belief that itching and pain are transmitted by the same nerve pathway, with low intensity stimulation of unmyelinated polymodal C fiber resulting in sensation of pruritus whereas high ...
- Chronic pruritus: a narrative review - PMC - NIH
The process begins in the epidermis and dermal-epidermal junction, where a pruritogen ‒ originating from immune cell products, exogenous compounds, or keratinocytes ‒ activates pruritic receptors on unmyelinated C-nerve fibers.14 These fibers can be classified as histaminergic or ...
- Peripheral Neuronal Mechanism of Itch - Itch - NCBI Bookshelf
2005, 2007), and the fact that itch sensations can be blocked by local anesthetics (Shelley and Melton 1950), point to a neuronal pathway mediating itch. It has been shown that histamine can activate a subset of mechanically insensitive C-fibers that transmit the itch response to the spinal cord ...
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