Thin, unmyelinated nerve fibers responsible for slow, dull second waves of pain. 

Johns Hopkins University

University of Rochester

Transient receptor potential vanilloid type 1, or TRPV1, acts as a receptor for capsaicin, as well as a detector of rises in temperature to signal burning. Because of this, it registers capsaicin as heat, and thus is responsible for the hot taste of chili peppers that we experience. Typically located on thin, unmyelinated C fibers (thus travels somewhat slowly by neuron standards and adapts slowly, providing the second wave of pain).
- C-fibers

TRPV1

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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