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| | Pain and nociception - Wikipedia, the free encyclopedia |
 | | This subjective reality of the localization of pain to an area of the body is the basis for speaking of pain receptor, neck pain, referred pain, cutaneous pain, as well as pain in my foot, kidney pain, or the painful uterine contractions occurring during childbirth. |
 | | Visceral pain is extremely difficult to localize, and several injuries to visceral tissue exhibit "referred" pain, where the sensation is localized to an area completely unrelated to the site of injury. |
 | | Since pain is defined as a signal of present or impending tissue damage affected by a harmful stimulus, the ability to experience pain or irritation is observable in most multicellular organisms. |
| en.wikipedia.org /wiki/Pain (3212 words) |
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