In undamaged areas, receptors and neurons can have sensitization, so people feel pain from stimuli that are not typically painful {allodynia}.
Intra-uterine devices can cause uterine pain {dysmenorrhoea}.
People can perceive pain {extra-territorial pain} in undamaged tissue near damaged tissue.
Without tissue damage or infection, peripheral pain nerves can increase spontaneous activity and cause pain {false pain}.
People can be sensitive to touch and have low pain threshold {hyperaesthesia, pain}.
Receptor or nerve sensitization can cause greater than normal reaction to pain stimuli {hyperalgesia}.
Tabes dorsalis has shooting pains {lightning pain} [Charcot, 1890].
People can perceive pain {mirror pain}| in undamaged tissue on body side opposite damaged tissue.
Chronic pain {neuropathic pain} can persist after nervous-system injury. Injury can change skin receptors {peripheral neuropathic pain}. Injury can change spinal-cord dorsal horn {central neuropathic pain}.
People that lose limbs often feel like they still have limb or feel sense qualities from former region {phantom limb}| [Melzack, 1992] [Ramachandran and Blakeslee, 1998] [Weir-Mitchell, 1872].
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Date Modified: 2022.0225