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Related Concept Videos

Nociception01:44

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Pain01:20

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Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
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Sensory Functions of the Skin01:16

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The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Introduction to the Integumentary System01:25

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The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
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Related Experiment Video

Updated: Jan 9, 2026

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
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Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors

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Itch and pain differences and commonalities.

Martin Schmelz1

  • 1Department of Anesthesiology and Intensive Care Medicine, Faculty of Medicine Mannheim, University of Heidelberg, Theodor-Kutzer Ufer 1-3, Mannheim, 68167, Germany, martin.schmelz@medma.uni-heidelberg.de.

Handbook of Experimental Pharmacology
|April 8, 2015
PubMed
Summary
This summary is machine-generated.

Pain and itch share overlapping mechanisms, challenging the view that they are antagonistic. Research should focus on these common pathways, especially for chronic conditions like neuropathic pain and itch.

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Area of Science:

  • Neuroscience
  • Dermatology
  • Pain Research

Background:

  • Traditionally, pain and itch are considered antagonistic, with evidence suggesting separate processing pathways.
  • Opioid-induced itch and pain-induced itch suppression support their opposing roles.
  • Distinct molecular markers identify neurons processing histaminergic and non-histaminergic itch.

Purpose of the Study:

  • To investigate the relationship between pain and itch processing.
  • To determine if common mechanisms underlie chronic itch and pain.
  • To advocate for integrated research approaches addressing shared pathways.

Main Methods:

  • Review of existing literature on pain and itch pathways.
  • Analysis of molecular markers and neuronal processing.
  • Examination of overlapping mediators and functional roles in primary afferents.

Main Results:

  • Evidence suggests overlapping mediators and functions in primary afferents for both pain and itch.
  • Nociceptive afferents can induce itch, and sensitization affects both nociceptors and pruriceptors.
  • Shared mechanisms, including primary afferent and spinal cord sensitization, likely contribute to chronic itch and pain.

Conclusions:

  • Pain and itch may not be entirely separate phenomena, sharing common underlying mechanisms.
  • Research should integrate studies of pain and itch, focusing on common pathways.
  • This integrated approach is crucial for understanding and treating chronic conditions like neuropathic pain and itch.