Pain is an unpleasant sensation which may be associated with actual or potential tissue damage and which may have physical and emotional components. According to the International Association for the Study of Pain (IASP), one should distinguish between pain and nociceptionIASP pain glossary. The word "pain" comes from the Latin "poena" meaning a fine, a penalty.
The term "pain" is a subjective experience that typically accompanies nociception, but can also arise without any stimulus, and thus includes the emotional response. Nociception, on the other hand, is a neurophysiological term and denotes specific activity in nerve pathways. It is the transmission mechanism for physiological pain, and does not describe psychological pain. These pathways transmit the nominally "painful" signals, though they are not always perceived as painful. Although pain can be associated with tissue damage or inflammation, this is often not the case.
Despite its unpleasantness, pain is a critical component of the body's defense system. It is part of a rapid warning relay instructing the motor neurons of the central nervous system to minimize detected physical harm. Lack of the ability to experience pain, as in the rare condition Congenital insensitivity to pain or Congenital Analgesia, can cause many various health problems.
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Chronic Pain Syndromes :: Neurological Disorders

Pain.com - Extensive information about pain and its treatment.
Chronic Pain - Information page compiled by National Institute of Neurological Disorders and Stroke.
Meta Description: [ Chronic pain information page compiled by the National Institute of Neurological Disorders and Stroke (NINDS). ]
Mayday UPPP - Provides awareness and information about the treatment of pain. Annotated links to related sites.
Meta Description: [ A web site providing an index of web based information and other resources relating to pain, presented by The Mayday Pain Project. ]
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Napp Pain Advisory Service - Educational pain resource for both healthcare professionals and the public.
Partners Against Pain - Resource for pain management offering free materials, tips, articles, information for patients and caregivers, and links to support groups.
Meta Description: [ Partners Against PainĀ® is an alliance of patients, caregivers, and healthcare providers working together to alleviate unnecessary suffering by leading efforts to advance standards of pain care through education and advocacy. ]
Pediatric Pain - Science Helping Children - Professional, research, and self help resources in the field of pain in infants, children, and adolescents.
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