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Hyperalgesia (/ ˌ h aɪ p ər æ l ˈ dʒ iː z i ə / or /-s i ə /; hyper from Greek ὑπέρ (huper) 'over' + -algesia from Greek ἄλγος (algos) 'pain') is an abnormally increased sensitivity to pain, which may be caused by damage to nociceptors or peripheral nerves and can cause hypersensitivity to stimulus.
Sherrington used many different experiments to demonstrate that different types of stimulation to an afferent nerve fiber's receptive field led to different responses. Some intense stimuli trigger reflex withdrawal, certain autonomic responses, and pain. The specific receptors for these intense stimuli were called nociceptors. [5]
Pain stimulus is a technique used by medical personnel for ... a number of neurological ... found if the brain is involved in the response to the pain ...
After nerve injury it is possible for touch fibres that normally carry non-noxious stimuli to be perceived as noxious. [5] Nociceptive pain consists of an adaptive alarm system. [6] Nociceptors have a certain threshold; that is, they require a minimum intensity of stimulation before they trigger a signal.
Neuropathic pain is associated with changes in sodium and calcium channel subunit expression resulting in functional changes. In chronic nerve injury, there is redistribution and alteration of subunit compositions of sodium and calcium channels resulting in spontaneous firing at ectopic sites along the sensory pathway. [13]
Congenital insensitivity to pain (CIP), also known as congenital analgesia, is one or more extraordinarily rare conditions in which a person cannot feel (and has never felt) physical pain. [1] The conditions described here are separate from the HSAN group of disorders, which have more specific signs and cause.
The gate control theory of pain asserts that non-painful input closes the nerve "gates" to painful input, which prevents pain sensation from traveling to the central nervous system. In the top panel, the nonnociceptive, large-diameter sensory fiber (orange) is more active than the nociceptive small-diameter fiber (blue), therefore the net input ...
The nerve impulses of the nociception response may be conducted to the brain thereby registering the location, intensity, quality and unpleasantness of the stimulus. This subjective component of pain involves conscious awareness of both the sensation and the unpleasantness (the aversive, negative affect). The brain processes underlying ...