Fast pain, also known as first pain, pricking pain, or sensory pain, is a sharp, precisely localized pain sensation that occurs rapidly after a stimulus. It is often described as a stinging or pricking sensation.
Characteristics of Fast Pain:
- Type of Stimuli: Typically elicited by stimuli such as needle pricks, pinpricks, or sharp cuts to the skin.
- Quality: Characterized by a sharp, acute, pricking, or stinging quality.
- Localization: Precisely localized, meaning the individual can accurately pinpoint the source of the pain.
- Duration: Short in duration; it doesn't linger for a prolonged period.
- Nerve Fibers: Carried rapidly by myelinated A-delta nerve fibers. These fibers allow for quick transmission of pain signals to the spinal cord and brain.
- Other Names: Also referred to as first pain, sensory pain, or pricking pain. This terminology emphasizes its rapid onset and well-defined sensory characteristics.
Example
Imagine accidentally pricking your finger with a needle. The initial sharp, stinging pain you feel almost immediately is an example of fast pain. You can easily identify the exact spot on your finger where the pain is originating, and the pain quickly subsides.
Comparison to Slow Pain
Fast pain differs significantly from slow pain (also called second pain). Slow pain is typically described as a dull, aching, or burning sensation that is poorly localized and has a longer duration. Slow pain is carried by unmyelinated C fibers, which transmit signals more slowly.
